ORCID Profile
0000-0002-7680-2240
Current Organisations
University of Macau
,
University of Adelaide
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Marine and Estuarine Ecology (incl. Marine Ichthyology) | Ecology | Geochemistry | Palaeoecology | Isotope Geochemistry | Genetics | Aquatic Ecosystem Studies and Stock Assessment | Freshwater Ecology | Fisheries Management | Marine And Estuarine Ecology (Incl. Marine Ichthyology) | Life Histories (Incl. Population Ecology) | Fisheries Sciences not elsewhere classified | Ore Deposit Petrology | Geology | Natural Resource Management | Geochronology And Isotope Geochemistry | Igneous and Metamorphic Petrology | Geochronology | Evidence And Procedure | Population Ecology | Conservation and Biodiversity | Environmental Monitoring | Community Ecology | Freshwater Ecology | Analytical Chemistry | Quaternary Environments | Wildlife and Habitat Management | Analytical Spectrometry | Fisheries Sciences | Evaluation Of Management Strategies | Population, Ecological and Evolutionary Genetics | Plant Physiology | Ecological Impacts of Climate Change | Population And Ecological Genetics |
ANZSRC Socio-Economic Objective (SEO)
Coastal and Estuarine Flora, Fauna and Biodiversity | Mineral Exploration not elsewhere classified | Marine Flora, Fauna and Biodiversity | Effects of Climate Change and Variability on Australia (excl. Social Impacts) | Living resources (flora and fauna) | Ecosystem Assessment and Management of Marine Environments | Physical and Chemical Conditions of Water in Fresh, Ground and Surface Water Environments (excl. Urban and Industrial Use) | Fisheries—recreational | Ecosystem Assessment and Management of Coastal and Estuarine Environments | Wild Caught Fin Fish (excl. Tuna) | Marine protected areas | Land and water management | Expanding Knowledge in the Earth Sciences | Marine Oceanic Processes (excl. climate related) | Estuarine and lagoon areas | Living resources (incl. impacts of fishing on non-target species) | Other | Protected Conservation Areas in Marine Environments | Fisheries - Wild Caught not elsewhere classified | Fish | Fisheries—commercial | Fresh, Ground and Surface Water Flora, Fauna and Biodiversity | Effects of Climate Change and Variability on Antarctic and Sub-Antarctic Environments (excl. Social Impacts) | Ecosystem Assessment and Management of Fresh, Ground and Surface Water Environments | Climate Variability (excl. Social Impacts) | Climate Change Models | Industrial chemicals and related products |
Related Links
Publications
Longitudinal variation and effects of habitat on biodiversity of Australasian temperate reef fishes
Publisher: Wiley
Date: 07-06-2014
DOI: 10.1111/JBI.12359
Relationship between elemental concentration and age from otoliths of adult snapper (Pagrus auratus, Sparidae): Implications for movement and stock structure
Publisher: CSIRO Publishing
Date: 2005
DOI: 10.1071/MF04157
Abstract: The present study investigated the stock structure of snapper (Pagrus auratus) in South Australia, and the extent to which this is influenced by adult movement. Fish from the 9+ age class were s led from six different regions, encompassing km of coastline and different habitat types. The chemistry of transverse sections of otoliths was s led using laser ablation inductively coupled plasma-mass spectrometry, providing elemental profiles that were related to age for the first nine years of the fish’s lives. The age-related annual averages for both 88Sr and 138Ba differed significantly between regions. They were, however, similar for the first three years, then erged considerably between the ages of three to five years, and then remained consistently different through to the age of nine years. This suggests that all fish, regardless of where captured, originated from only one or two nursery areas, but dispersed throughout the different regions between the ages of three to five years, before becoming resident to their new regions of occupancy. Thus, this population of snapper represents a single, large, stock where the in iduals have a common origin, but through age-related emigration ultimately disperse and supplement the low abundance populations in regional State waters.
Calcium and strontium isotope systematics in the lagoon-estuarine environments of South Australia: Implications for water source mixing, carbonate fluxes and fish migration
Publisher: Elsevier BV
Date: 10-2018
Extrinsic factors affecting otolith chemistry – implications for interpreting migration patterns in a diadromous fish
Publisher: Springer Science and Business Media LLC
Date: 13-02-2018
Coupling biogeochemical tracers with fish growth reveals physiological and environmental controls on otolith chemistry
Publisher: Wiley
Date: 12-07-2017
DOI: 10.1002/ECM.1264
Population structure in a wide-ranging coastal teleost (Argyrosomus japonicus, Sciaenidae) reflects marine biogeography across southern Australia
Publisher: CSIRO Publishing
Date: 2016
DOI: 10.1071/MF15044
Abstract: Population structure in marine teleosts is often investigated to aid conservation and fisheries management (e.g. to assess population structure to inform restocking programs). We assessed genetic population structure of the important estuary-associated marine fish, mulloway (Argyrosomus japonicus), within Australian waters and between Australia and South Africa. Genetic variation was investigated at 13 polymorphic microsatellite markers. FST values and Bayesian estimates in STRUCTURE suggested population differentiation of mulloway within Australia and confirm strong differentiation between South Africa and Australia. The 12 Australian s le sets fell into one of four spatially separated genetic clusters. Initially, a significant signal of isolation-by-distance (IBD) was evident among Australian populations. However, further investigation by decomposed-pairwise-regression (DPR) suggested five s le sets were influenced more by genetic-drift, rather than gene-flow and drift equilibrium, as expected in strong IBD cases. Cryptic oceanographic and topographical influences may isolate mulloway populations from south-western Australia. The results demonstrate that DPR is suitable to assess population structure of coastal marine species where barriers to gene flow may be less obvious than in freshwater systems. Information on the relative strengths of gene flow and genetic drift facilitates a more comprehensive understanding of the evolutionary forces that lead to population structure, which in turn informs fisheries and assists conservation management. Large-bodied predatory scale-fish may be under increasing pressure on a global scale, owing to a variety of anthropogenic reasons. In southern Australia, the iconic sciaenid A. japonicus (mulloway, jewfish or kob) is no exception. Despite the species supporting important fisheries, much of its ecology is poorly understood. It is possible that a greater understanding of their genetic population structure can help ensure a sustainable future for the only southern Australian sciaenid.
Use of otolith chemical signatures to estimate carp recruitment sources in the mid-Murray River, Australia
Publisher: Wiley
Date: 2006
DOI: 10.1002/RRA.941
Diversity and depth-related patterns of mobile invertebrates associated with kelp forests
Publisher: CSIRO Publishing
Date: 2007
DOI: 10.1071/MF06216
Abstract: It is remarkable that although the importance of depth is firmly rooted in the discipline of marine ecology, so little is understood about depth-related patterns of invertebrates in kelp forests, particularly in temperate Australia. We tested for the existence of broad scale patterns in depth-related ersity and abundance of mobile invertebrates in kelp holdfasts (Ecklonia radiata) across several spatial scales along 500 km of coastline. There was a greater abundance and richness of common taxa in holdfasts from shallow relative to deep waters. Strikingly, a disproportionately large percentage (60%) of species was unique to holdfasts from shallow reefs, suggesting that shallow environments create conditions that facilitate a rich bio ersity of invertebrate fauna. We conclude that depth-related variation in kelp forests may not be completely idiosyncratic, and coherent research programs of a broader scale and scope may unify subsets of fragmented knowledge that previously provided little insight into general depth-related patterns of invertebrate assemblages.
Assessing the trophic ecology of top predators across a recolonisation frontier using DNA metabarcoding of diets
Publisher: Inter-Research Science Center
Date: 21-06-2017
DOI: 10.3354/MEPS12165
Fur seal activity moderates the effects of an Australian marine sanctuary on temperate reef fish
Publisher: Elsevier BV
Date: 02-2015
Consistency of patterns between laboratory experiments and field collected fish in otolith chemistry: an example and applications for salinity reconstructions
Publisher: CSIRO Publishing
Date: 2005
DOI: 10.1071/MF04146
Abstract: Elemental concentrations within fish otoliths can track movements and migrations of fish through gradients of environmental variables. Tracking the movements of fish relies on establishing links between environmental variables and otolith chemistry, with links commonly made using laboratory experiments that rear juvenile fish. However, laboratory experiments done on juvenile fish may not accurately reflect changes in wild fish, particularly adults. We tested the hypotheses that: (1) the relationship between ambient (water) and otolith chemistry is similar between laboratory-reared black bream (Acanthopagrus butcheri) and wild black bream and (2) ontogeny does not influence otolith chemistry. Field-collected and laboratory-reared fish showed similar effects of ambient strontium : calcium (Sr : Ca) on otolith Sr : Ca concentrations. However, ambient and otolith barium : calcium concentrations (Ba : Ca) differed slightly between laboratory-reared and field-collected fish. Importantly, fish reared in stable environmental variables showed no influence of ontogeny on Sr : Ca or Ba : Ca concentrations. Natural distributions of ambient Sr : Ca showed no clear relationship to salinity, yet, ambient Ba : Ca was inversely related to salinity. The distribution of ambient Sr : Ca and Ba : Ca in estuaries inhabited by black bream, suggest that these elements can answer different questions regarding environmental histories of fish. Reconstructing salinity histories of black bream using otolith Ba : Ca concentrations seems plausible, if adequate knowledge of Ba : Ca gradients within estuaries is obtained.
Correction: Reading the biomineralized book of life: expanding otolith biogeochemical research and applications for fisheries and ecosystem-based management
Publisher: Springer Science and Business Media LLC
Date: 12-09-2022
Contribution of stocked fish to riverine populations of golden perch (Macquaria ambigua) in the Murray–Darling Basin, Australia
Publisher: CSIRO Publishing
Date: 2016
DOI: 10.1071/MF15037
Abstract: Stocking of native fishes is conducted to augment riverine fisheries in many parts of the world, yet most stocking activities are conducted without empirical information on their effectiveness or impacts. In the Murray–Darling Basin (MDB), Australia, stocking has been underway for several decades to maintain recreational fisheries. We stocked chemically tagged golden perch (Macquaria ambigua) fingerlings in three rivers to determine the proportions of stocked fish within populations of the species. Stocked sites were monitored for up to 5 years in the Murrumbidgee River, Edward River and Billabong Creek and non-stocked sites were monitored in the Murray River. Catch per unit effort of stocked year classes increased substantially in Billabong Creek, with stocked fish contributing 100 (2005), 79 (2006) and 92% (2007). Chemically tagged fish comprised 18–38% of the respective age classes in the Murrumbidgee and Edward rivers and there was little evidence of natural recruitment in the non-stocked Murray River. Tagged fish generally attained the legal minimum size within 4 years and had dispersed up to 60km from the original release location. Our results demonstrate that artificial stocking has the potential to strongly influence the abundance and population structure of golden perch in rivers of the MDB.
Otoliths in archaeology: Methods, applications and future prospects
Publisher: Elsevier BV
Date: 04-2016
Untapping the potential of sulfur isotope analysis in biominerals
Publisher: Inter-Research Science Center
Date: 28-06-2018
DOI: 10.3354/MEPS12605
Comparative population genomics confirms little population structure in two commercially targeted carcharhinid sharks
Publisher: Springer Science and Business Media LLC
Date: 09-01-2019
Influence of habitat on abundance and size structure of a large temperate-reef fish, Achoerodus viridis (Pisces: Labridae)
Publisher: Springer Science and Business Media LLC
Date: 29-10-1998
Climate-driven disparities among ecological interactions threaten kelp forest persistence
Publisher: Wiley
Date: 06-08-2017
DOI: 10.1111/GCB.13414
Abstract: The combination of ocean warming and acidification brings an uncertain future to kelp forests that occupy the warmest parts of their range. These forests are not only subject to the direct negative effects of ocean climate change, but also to a combination of unknown indirect effects associated with changing ecological landscapes. Here, we used mesocosm experiments to test the direct effects of ocean warming and acidification on kelp biomass and photosynthetic health, as well as climate-driven disparities in indirect effects involving key consumers (urchins and rock lobsters) and competitors (algal turf). Elevated water temperature directly reduced kelp biomass, while their turf-forming competitors expanded in response to ocean acidification and declining kelp canopy. Elevated temperatures also increased growth of urchins and, concurrently, the rate at which they thinned kelp canopy. Rock lobsters, which are renowned for keeping urchin populations in check, indirectly intensified negative pressures on kelp by reducing their consumption of urchins in response to elevated temperature. Overall, these results suggest that kelp forests situated towards the low-latitude margins of their distribution will need to adapt to ocean warming in order to persist in the future. What is less certain is how such adaptation in kelps can occur in the face of intensifying consumptive (via ocean warming) and competitive (via ocean acidification) pressures that affect key ecological interactions associated with their persistence. If such indirect effects counter adaptation to changing climate, they may erode the stability of kelp forests and increase the probability of regime shifts from complex habitat-forming species to more simple habitats dominated by algal turfs.
Using otolith chronologies to understand long-term trends and extrinsic drivers of growth in fisheries
Publisher: Wiley
Date: 2019
DOI: 10.1002/ECS2.2553
Element composition of shark vertebrae shows promise as a natural tag
Publisher: CSIRO Publishing
Date: 2019
DOI: 10.1071/MF18423
Abstract: Reconstructing movements and environmental histories of sharks may be possible by using the element composition of vertebrae, but unlocking such possibilities requires an understanding of the effects of extrinsic and intrinsic factors on element composition. We assessed water temperature and pH effects (independently and in combination) on vertebral chemistry of Port Jackson sharks while accounting for intrinsic factors (condition and sex) using indoor aquaria and outdoor mesocosm environments, where the latter may better reflect natural field conditions. We analysed eight element:Ca ratios (7Li, 8B, 24Mg, 55Mn, 65Cu, 88Sr, 138Ba and 238U) by laser ablation inductively coupled plasma mass spectrometry and found positive temperature-dependant responses for multiple elements, including B:Ca, Mn:Ca, Sr:Ca and Ba:Ca (r2=0.43, 0.22, 0.60 and 0.35 respectively), whereas pH had a minor effect on vertebral Mg:Ca and Li:Ca (r2=0.10 and 0.31 respectively). As shown for teleost otoliths, condition affected element composition (Mn:Ca), suggesting potential physiological influences on element uptake. The suitability of vertebral chemistry as a natural tag appears to be element specific, and likely governed by a suite of potentially codependent extrinsic and intrinsic factors. Overall, variations in vertebrae chemistry show promise to reconstruct movements and habitat use of cartilaginous fishes. Yet, further research is required to understand the ubiquitous nature of the findings presented here.
Offstream movements of fish during drought in a regulated lowland river
Publisher: Wiley
Date: 21-11-2011
DOI: 10.1002/RRA.1419
Reconstructing climategrowth relations from the teeth of a marine mammal
Publisher: Springer Science and Business Media LLC
Date: 14-03-2016
Interactive effects of temperature and salinity on otolith chemistry: challenges for determining environmental histories of fish
Publisher: Canadian Science Publishing
Date: 11-2002
DOI: 10.1139/F02-154
Abstract: The concentrations of elements and isotopes in fish otoliths may provide a method of reconstructing movements of fish by differentiating between water bodies of different temperatures and salinities. However, before otoliths can be used to reconstruct environmental histories of fish, it is necessary to assess the effects of seawater temperature and salinity on otolith microchemistry. Using controlled laboratory experiments, juvenile black bream, Acanthopagrus butcheri (family Sparidae), were reared for 50 days in aquaria of varying temperatures and salinities using three experimental designs: temperature × salinity, temperature only, and salinity only. Temperature and salinity interacted to significantly affect the elemental concentration ratios of Sr:Ca and Ba:Ca and the concentrations of isotopes δ 13 C and δ 18 O in otoliths. The single-factor experiments showed that temperature significantly affected the concentration ratios of Sr:Ca and Ba:Ca and the concentrations of δ 13 C and δ 18 O in otoliths, whereas salinity alone did not affect the concentration ratios of any elements but did affect both isotopes. The concentration ratios of Mg:Ca and Mn:Ca varied considerably among fish within the same treatment level and showed little or no effects due to temperature and (or) salinity. The significant interactive effects of temperature and salinity on otolith microchemistry highlight the need for a multifactorial approach to testing hypotheses regarding the environmental histories of fish.
The use of food resources by 0+ snapper, Chrysophrys auratus, from northern Spencer Gulf, South Australia
Publisher: CSIRO Publishing
Date: 2012
DOI: 10.1071/MF11266
Abstract: Food availability is an important factor in survival and growth of juvenile fish and has been proposed as a major factor shaping the patterns of distribution and abundance of 0+ snapper, Chrysophrys auratus, in New Zealand and Japan. Thus, we tested the hypothesis that diet of 0+ snapper would exhibit spatial variation related to their abundance within a major nursery region. Therefore, we described the stomach contents of 0+ snapper collected from within a nursery region in areas of low and high abundance of 0+ snapper. The data also provided the opportunity to consider sized based differences in diet and temporal feeding patterns. 0+ snapper were generalist carnivores that preyed on a wide range of invertebrates and fish. No evidence of sized based dietary variation was identified but feeding either ceased or was much reduced during the hours of darkness. The major finding was that more polychaetes were present in the stomachs of 0+ snapper in the area of high 0+ snapper abundance than in the areas of low 0+ snapper abundance. The spatial differences in diet observed supports the hypothesis that prey availability is important as a driver of habitat selection by 0+ fish.
Antarctic patterns of shallow subtidal habitat and inhabitants in Wilke’s Land
Publisher: Springer Science and Business Media LLC
Date: 19-12-2006
An investigation of chronological differences in the deposition of trace metals in the otoliths of two temperate reef fishes
Publisher: Elsevier BV
Date: 11-1996
Marine nurseries and effective juvenile habitats
Publisher: Inter-Research Science Center
Date: 2006
DOI: 10.3354/MEPS318307
Trophic niche segregation allows range‐extending coral reef fishes to co‐exist with temperate species under climate change
Publisher: Wiley
Date: 17-12-2019
DOI: 10.1111/GCB.14898
Abstract: Changing climate is forcing many terrestrial and marine species to extend their ranges poleward to stay within the bounds of their thermal tolerances. However, when such species enter higher latitude ecosystems, they engage in novel interactions with local species, such as altered predator-prey dynamics and competition for food. Here, we evaluate the trophic overlap between range-extending and local fish species along the east coast of temperate Australia, a hotspot for ocean warming and species range extensions. Stable isotope ratios (δ
Spatial variation in elemental composition of otoliths of three species of fish (family Sparidae)
Publisher: Elsevier BV
Date: 08-2003
Where do elements bind within the otoliths of fish?
Publisher: CSIRO Publishing
Date: 2016
DOI: 10.1071/MF15064
Abstract: Otolith element analyses are used extensively to reconstruct environmental histories of fish based on the assumption that elements substitute for calcium within the CaCO3 otolith structure. However, elements may also be incorporated within the protein component of the otolith in addition to the direct substitution for calcium in the mineral component, and this could introduce errors in environmental reconstructions. The aim of the present study was to determine whether elements were incorporated into the protein or mineral components of otoliths and the relative proportion of each element in each component. Element concentrations from whole ground otoliths and the isolated protein component were quantified using solution inductively coupled plasma mass spectrometry (ICP-MS). Of the 12 elements investigated, most were found in both the proteinaceous and mineral components, but always in greater concentrations in the latter. Elements considered ‘non-essential’ to fish physiology with Ca-like properties (i.e. alkaline metals) were present in the mineral component in relatively high concentrations. Elements essential to fish physiology with smaller atomic radii than Ca (i.e. transition metals) were distributed throughout the protein and mineral components of the otolith. These findings enhance our understanding of element incorporation in the otolith and, ultimately, improve interpretations of otolith-based environmental reconstructions.
The influence of high pCO2 on otolith shape, chemical and carbon isotope composition of six coastal fish species in a Mediterranean shallow CO2 vent
Publisher: Springer Science and Business Media LLC
Date: 30-08-2017
Climate change and Australian marine and freshwater environments, fishes and fisheries: synthesis and options for adaptation
Publisher: CSIRO Publishing
Date: 2011
DOI: 10.1071/MF11139
Abstract: Anthropogenic climate change is already apparent and will have significant, ongoing impacts on Australian fishes and their habitats. Even with immediate actions to reduce greenhouse gases, there will be sustained environmental changes. Therefore, it is necessary to consider appropriate adaptations to minimise detrimental impacts for both fishes and the human populations that utilise them. Climate change will have a range of direct effects on the physiology, fitness, and survivorship of Australia’s marine, estuarine and freshwater fishes, but also indirect effects via habitat degradation and changes to ecosystems. Effects will differ across populations, species and ecosystems, with some impacts being complex and causing unexpected outcomes. The range of adaptation options and necessary levels of intervention to maintain populations and ecosystem function will largely depend on the vulnerability of species and habitats. Climate change will also have an impact on people who depend on fishes for food or livelihoods adapting to a new climate regime will mean trade-offs between biological assets and socioeconomic drivers. Models can be used to help predict trends and set priorities however, they must be based on the best available science and data, and include fisheries, environmental, socioeconomic and political layers to support management actions for adaptation.
Integrating management of marine activities in Australia
Publisher: Elsevier BV
Date: 03-2023
Analysis of vertebral chemistry to assess stock structure in a deep-sea shark, Etmopterus spinax
Publisher: Oxford University Press (OUP)
Date: 27-10-2016
Abstract: Deep-sea sharks play a valuable ecological role helping maintain food web balance, yet they are vulnerable to commercial fishing because of slow growth rates and low reproductive capacity. Overfishing of sharks can heavily impact marine ecosystems and the fisheries these support. Knowledge of stock structure is integral to sustainable management of fisheries. The present study analysed vertebral chemistry using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) to assay concentrations of 7Li, 23Na, 24Mg, 55Mn, 59Co, 60Ni, 63Cu, 66Zn, 85Rb, 88Sr, 138Ba and 208Pb to assess stock structure in a deep-sea shark, Etmopterus spinax, in Norwegian and French waters. Few studies have applied this technique to elasmobranch vertebrae and the present study represents its first application to a deep-sea shark. Three stocks were identified at the regional scale off western Norway, southern Norway, and France. At finer spatial scales there was evidence of strong population mixing. Overall, the general pattern of stock structure outlined herein provides some indication of the spatial scales at which stocks should be viewed as distinct fisheries management units. The identification of an effective multi-element signature for distinguishing E. spinax stocks utilizing Sr, Ba, Mg, Zn and Pb and the methodological groundwork laid in the present study could also expedite future research into stock structure for E. spinax and deep-sea elasmobranchs more generally.
Juvenile fish habitat across the inner Danish waters: Using otolith chemistry to discriminate between hybridising con-familials and contiguous, coastal habitat
Publisher: Elsevier BV
Date: 05-2019
One Hundred Pressing Questions on the Future of Global Fish Migration Science, Conservation, and Policy
Publisher: Frontiers Media SA
Date: 19-08-2019
Sources of otolith barium and strontium in estuarine fish and the influence of salinity and temperature
Publisher: Inter-Research Science Center
Date: 07-05-2012
DOI: 10.3354/MEPS09653
Seagrasses, Fish, and Fisheries
Publisher: Springer Netherlands
Date: 2006
Temporal variability in strontium, calcium, barium, and manganese in estuaries: Implications for reconstructing environmental histories of fish from chemicals in calcified structures
Publisher: Elsevier BV
Date: 2006
Anthropogenic threat assessment of marine-associated fauna in Spencer Gulf, South Australia
Publisher: Elsevier BV
Date: 07-2017
Using enriched stable isotopes of barium and magnesium to batch mark otoliths of larval golden perch (Macquaria ambigua, Richardson)
Publisher: Wiley
Date: 08-12-2011
Using the giant Australian cuttlefish (Sepia apama) mass breeding aggregation to explore the life cycle of dicyemid parasites
Publisher: Walter de Gruyter GmbH
Date: 2013
DOI: 10.2478/S11686-013-0186-Y
Abstract: Dicyemid mesozoan parasites, microscopic organisms found with high intensities in the renal appendages of benthic cephalopods, have a complex, partially unknown life cycle. It is uncertain at which host life cycle stage (i.e. eggs, juvenile, adult) new infection by the dispersive infusoriform embryo occurs. As adult cephalopods have a short lifespan and die shortly after reproducing only once, and juveniles are fast-moving, we hypothesize that the eggs are the life cycle stage where new infection occurs. Eggs are abundant and sessile, allowing a huge number of new in iduals to be infected with low energy costs, and they also provide dicyemids with the maximum amount of time for survival compared with infection of juvenile and adult stages. In our study we collected giant Australian cuttlefish (Sepia apama) eggs at different stages of development and filtered seawater s les from the S. apama mass breeding aggregation area in South Australia, Australia, and tested these s les for the presence of dicyemid DNA. We did not recover dicyemid parasite cytochrome c oxidase subunit I (COI) nucleotide sequences from any of the s les, suggesting eggs are not the stage where new infection occurs. To resolve this unknown in the dicyemid life cycle, we believe experimental infection is needed.
Variation in morphology and life-history strategy of an exploited sparid fish
Publisher: CSIRO Publishing
Date: 2016
DOI: 10.1071/MF15056
Abstract: Defining appropriate management units to balance productivity and yield of exploited species is fundamental to effective resource management. Anecdotal and tag–recapture information related to morphology, movement behaviour and life-history strategy suggest that separate groups of snapper (Chrysophrys auratus) exist in the Hauraki Gulf, New Zealand. To address the existence of discrete groups, we examined morphology, meristics and otolith chemistry from snapper collected throughout the Hauraki Gulf. We also used tag–recapture information, stable isotope analysis and interpreted functional aspects of morphology and meristics data to understand potential life-history strategy differences. Snapper from rocky reef habitats did not display morphology and meristic features distinct from snapper from soft sediment habitats and differences in otolith chemistry and stable isotope ratios could respectively be explained by a locational influence and predominance of kelp in rocky reef food webs. Conversely, snapper collected from a known spawning area had distinct morphological and meristic features consistent with semi–pelagic sparids and stable isotope analysis also indicated a potentially more pelagic and higher trophic-level diet. Maintenance of population complexity such as this is generally beneficial to fish populations, and can be achieved by revisiting the spatial units used for fishery management.
Local complexity in patterns of canopy-benthos associations produces regional patterns across temperate Australasia
Publisher: Springer Science and Business Media LLC
Date: 02-2004
Q10 measures of metabolic performance and critical swimming speed in King George whiting Sillaginodes punctatus
Publisher: Wiley
Date: 16-02-2017
DOI: 10.1111/JFB.13273
Abstract: This study examined thermally driven changes in swimming performance and aerobic metabolism (Q
Long-term archaeological and historical archives for mulloway, Argyrosomus japonicus, populations in eastern South Australia
Publisher: Elsevier BV
Date: 09-2018
Evidence for a broad-scale decline in giant Australian cuttlefish (Sepia apama) abundance from non-targeted survey data
Publisher: CSIRO Publishing
Date: 2015
DOI: 10.1071/MF14081
Abstract: Little is known about the population trajectory and dynamics of many marine invertebrates because of a lack of robust observational data. The giant Australian cuttlefish (Sepia apama) is IUCN-listed as Near Threatened because the largest known breeding aggregation of this species in northern Spencer Gulf, South Australia, has declined markedly since the turn of the century. We used by-catch records from long-term trawl surveys to derive abundance data for S. apama and commercial cuttlefish harvest data as a measure of exploitation. Using Bayesian hierarchical models to account for zero-inflation and spatial dependence in these abundance counts, we demonstrated a high probability of broad-scale declines in the density of S. apama, particularly surrounding the primary aggregation site, which supports the recent closure of the entire S. apama fishery in northern Spencer Gulf. Historical harvest data were positively correlated with S. apama density estimated from the trawl surveys, suggesting that the commercial cuttlefish catch tracks the species abundance. Our results also indicated the possibility that the known S. apama breeding grounds might be supplemented by in iduals that were spawned elsewhere in northern Spencer Gulf.
Statolith chemistry of two life history stages of cuttlefish: Effects of temperature and seawater trace element concentration
Publisher: Elsevier BV
Date: 2013
Reading the biomineralized book of life: expanding otolith biogeochemical research and applications for fisheries and ecosystem-based management
Publisher: Springer Science and Business Media LLC
Date: 07-08-2022
DOI: 10.1007/S11160-022-09720-Z
Abstract: Chemical analysis of calcified structures continues to flourish, as analytical and technological advances enable researchers to tap into trace elements and isotopes taken up in otoliths and other archival tissues at ever greater resolution. Increasingly, these tracers are applied to refine age estimation and interpretation, and to chronicle responses to environmental stressors, linking these to ecological, physiological, and life-history processes. Here, we review emerging approaches and innovative research directions in otolith chemistry, as well as in the chemistry of other archival tissues, outlining their value for fisheries and ecosystem-based management, turning the spotlight on areas where such biomarkers can support decision making. We summarise recent milestones and the challenges that lie ahead to using otoliths and archival tissues as biomarkers, grouped into seven, rapidly expanding and application-oriented research areas that apply chemical analysis in a variety of contexts, namely: (1) supporting fish age estimation (2) evaluating environmental stress, ecophysiology and in idual performance (3) confirming seafood provenance (4) resolving connectivity and movement pathways (5) characterising food webs and trophic interactions (6) reconstructing reproductive life histories and (7) tracing stock enhancement efforts. Emerging research directions that apply hard part chemistry to combat seafood fraud, quantify past food webs, as well as to reconcile growth, movement, thermal, metabolic, stress and reproductive life-histories provide opportunities to examine how harvesting and global change impact fish health and fisheries productivity. Ultimately, improved appreciation of the many practical benefits of archival tissue chemistry to fisheries and ecosystem-based management will support their increased implementation into routine monitoring. Graphical abstract
Evaluating estuarine nursery use and life history patterns of Pomatomus saltatrix in eastern Australia
Publisher: Inter-Research Science Center
Date: 28-06-2018
DOI: 10.3354/MEPS12495
Opposing life stage‐specific effects of ocean warming at source and sink populations of range‐shifting coral‐reef fishes
Publisher: Wiley
Date: 10-12-2021
Natural and anthropogenic climate variability shape assemblages of range‐extending coral‐reef fishes
Publisher: Wiley
Date: 17-02-2021
DOI: 10.1111/JBI.14058
Otolith chemistry delineates the influence of natal origin, dispersal and flow on the population dynamics of golden perch (Macquaria ambigua) in a regulated river
Publisher: CSIRO Publishing
Date: 29-06-2021
DOI: 10.1071/MF20280
Abstract: For riverine fishes threatened by fragmentation and flow modification, effective management requires an understanding of when and where key life history processes (spawning, recruitment and movement) take place. The structural and chemical properties of otoliths provide a unique means to recount a fish’s life in time and space. We investigated the age structure of the migratory, pelagic-spawning golden perch (Macquaria ambigua) in the Murray River, Australia, and used water and otolith 87Sr/86Sr ratios to delineate the natal origin and movement of fish from discrete cohorts. Water 87Sr/86Sr was distinct among the Darling River (a major tributary) and lower and mid-Murray River. Otolith chemistry revealed golden perch collected in the lower Murray River were progeny of spawning in either the Murray or Darling rivers, during years characterised by within-channel rises in flow, or in both rivers in a year of overbank flooding. Movement of juvenile fish from the Darling River substantially influenced population structure in the lower Murray River, whereby post-flood population growth was largely due to the immigration of age-1+ fish. This study demonstrates the potential importance of tributary recruitment sources, dispersal and connectivity on main-stem population dynamics and the utility of otolith chemistry for spatially reconciling population structure and the life histories of freshwater fishes.
Reconstructing migratory patterns of fish based on environmental influences on otolith chemistry
Publisher: Springer Science and Business Media LLC
Date: 2003
Enriched stable isotope marking of juvenile golden perch (Macquaria ambigua) otoliths
Publisher: Canadian Science Publishing
Date: 02-2008
DOI: 10.1139/F08-010
Abstract: Stocking of native fish is a standard practice to aid in the recovery and enhancement of depleted populations. However, evaluating the effectiveness of these stocking programs has been hindered because of difficulty in distinguishing hatchery from wild fish, especially for species that are stocked as small, fragile fingerlings. Stable isotopes offer the potential to chemically mark fish with multiple marks that are distinct from each other and from natural signatures. Golden perch (Macquaria ambigua) fingerlings were reared in water enriched in 137 Ba and combinations of 137 Ba and 86 Sr for various lengths of time. Ba and Sr isotopic ratios in the otoliths were determined using laser ablation inductively coupled plasma-mass spectrometry. Fish exposed to increased levels of 137 Ba had lower 138 Ba/ 137 Ba ratios in their otoliths relative to the natural ratio of control fish and were significantly different in fish exposed to at least 5 µg·L -1 for 8 days or to 15 µg·L -1 for 4 days. Furthermore, eight unique signatures were produced in fish reared in combinations of 137 Ba (0–5 µg·L -1 ) and 86 Sr (0–100 µg·L -1 ) for 24 days. Our results suggest that immersion in water enriched in specific stable isotopes could be an effective means of marking hatchery-reared fish for stock enhancement.
Strontium Randomly Substituting for Calcium in Fish Otolith Aragonite
Publisher: American Chemical Society (ACS)
Date: 10-12-2013
DOI: 10.1021/AC4034278
Abstract: The chemistry of fish ear bones (otoliths) is used to address fundamental questions in fish ecology and fisheries science. It is assumed that strontium (Sr), the most important element used in otolith chemistry research, is bound within the aragonitic calcium carbonate lattice of otoliths via random chemical replacement of calcium however, this has never been tested and three other alternatives exist with regard to how Sr may be incorporated. If any variation in the mode of incorporation occurs, otolith chemistry data may be misinterpreted, impacting how fish and fisheries are understood and managed. Using X-ray absorption spectroscopy (specifically, analysis of extended X-ray absorption fine structure or EXAFS), we investigated how Sr is incorporated within fish otoliths from seven species collected from a range of aquatic environments. For comparison, aragonitic structures from other aquatic taxa (cephalopods and coral) were also analyzed. The results consistently indicated for all s les that Sr randomly replaces Ca within the aragonite lattice. This research explicitly shows how Sr is bound within otoliths and validates a fundamental and long-held assumption in aquatic research.
Vertebral chemistry demonstrates movement and population structure of bronze whaler
Publisher: Inter-Research Science Center
Date: 08-09-2016
DOI: 10.3354/MEPS11840
Investigating bomb radiocarbon transport in the southern Pacific Ocean with otolith radiocarbon
Publisher: Elsevier BV
Date: 08-2015
Isolation of additional polymorphic tri- and tetranucleotide microsatellite loci for the giant Australian cuttlefish (Sepia apama)
Publisher: Wiley
Date: 15-03-2007
Pre-Columbian Fishing on the Coast of the Atacama Desert, Northern Chile: An Investigation of Fish Size and Species Distribution Using Otoliths From Camarones Punta Norte and Caleta Vitor
Publisher: Informa UK Limited
Date: 18-07-2017
Accelerometry estimates field metabolic rate in giant Australian cuttlefish Sepia apama during breeding
Publisher: Wiley
Date: 28-09-2010
DOI: 10.1111/J.1365-2656.2010.01758.X
Abstract: 1. Estimating the metabolic rate of animals in nature is central to understanding the physiological, behavioural and evolutionary ecology of animals. Doubly labelled water and heart-rate methods are the most commonly used approaches, but both have limitations that preclude their application to some systems. 2. Accelerometry has emerged as a powerful tool for estimating energy expenditure in a range of animals, but is yet to be used to estimate field metabolic rate in aquatic taxa. We combined two-dimensional accelerometry and swim-tunnel respirometry to estimate patterns of energy expenditure in giant Australian cuttlefish Sepia apama during breeding. 3. Both oxygen consumption rate (Vo2) and swimming speed showed strong positive associations with body acceleration, with coefficients of determination comparable to those using similar accelerometers on terrestrial vertebrates. Despite increased activity during the day, field metabolic rate rarely approached Vo2, and night-time Vo2 was similar to that at rest. 4. These results are consistent with the life-history strategy of this species, which has a poor capacity to exercise anaerobically, and a mating strategy that is visually based. With the logistical difficulties associated with observation in aquatic environments, accelerometry is likely to prove a valuable tool for estimating energy expenditure in aquatic animals.
The Chemical Composition of Xiphophora gladiata (Phaeophyceae: Fucales): Seasonal and within Plant Variation
Publisher: Walter de Gruyter GmbH
Date: 1994
Relative contribution of water and diet to otolith chemistry in freshwater fish
Publisher: Inter-Research Science Center
Date: 26-06-2013
DOI: 10.3354/AB00511
Seasonally resolved environmental reconstructions using fish otoliths
Publisher: Canadian Science Publishing
Date: 2017
Abstract: Exploiting the chemical and growth properties of otoliths, this study demonstrates how environmental archives with high temporal resolution can be developed. Elemental profiles (Ba:Ca and Sr:Ca) of fish otoliths (ear bones) from the estuarine species Acanthopagrus butcheri (black bream) were related to growth increments on a seasonal time scale. A series of mixed effects models were used to investigate biological, temporal, and environmental factors influencing seasonal otolith elemental profiles. Resultant seasonally resolved chemical chronologies were correlated with environmental data (i.e., salinity) to develop an element–salinity regression function, which when fit to an independently derived chemical chronology showed strong agreement between reconstructed and recorded salinities. Support for the element–salinity regression function through independent verification provided confidence in environmental reconstructions derived from an archaeological otolith. This suggests otoliths can be used to reconstruct past environmental conditions over decadal and centennial time scales. Moreover, the application of mixed effect models to develop chemical chronologies also provides information on drivers of elemental profiles and allows a range of ecological questions to be addressed. This approach may be further adapted and employed across a broader range of taxonomic groups and environments.
Dispersal and gene flow in the habitat-forming kelp, Ecklonia radiata: Relative degrees of isolation across an eastwest coastline
Publisher: CSIRO Publishing
Date: 2009
DOI: 10.1071/MF08268
Abstract: Characterising patterns of dispersal and gene flow in habitat-forming organisms is becoming a focal concern for conservation and management strategies as anthropogenic impacts drive change in coastal ecosystems. Here, we use six microsatellite markers to characterise dispersal and gene flow across the South Australian distribution of the habitat-forming kelp Ecklonia radiata. Populations of E. radiata on subtidal reefs in South Australia were highly genetically structured on large (100s of km, FST = 0.211) and small (10s of km, FST = 0.042) spatial scales with the extent of differentiation positively correlated with geographic distances among populations. Neither the presence of oceanic currents nor intervening rocky reef habitats appeared to facilitate widespread gene flow. There was a trend for island populations to be more genetically differentiated from those on the mainland and to have slightly greater levels of heterozygosity than mainland populations. Our results show relatively low dispersal and gene flow suggesting that recovery following kelp loss may be slow. Such information not only provides insights into relative rates of recovery, but may also identify which populations may be best used for propagation and restoration efforts.
Entrainment and advection of larval sardine, Sardinops sagax, by the East Australian Current and retention in the western Tasman Front
Publisher: Wiley
Date: 11-2014
DOI: 10.1111/FOG.12089
Otolith shape and elemental composition: Complementary tools for stock discrimination of mulloway (Argyrosomus japonicus) in southern Australia
Publisher: Elsevier BV
Date: 06-2011
Microplastic in fish – A global synthesis
Publisher: Springer Science and Business Media LLC
Date: 20-09-2021
Investigating microplastic contamination and biomagnification in a remote area of South Australia
Publisher: CSIRO Publishing
Date: 08-06-2023
DOI: 10.1071/MF22236
Abstract: Context Microplastics are widespread in aquatic ecosystems and are commonly recorded in water, sediment and a broad spectrum of marine biota. Yet, the extent to which organisms ingest microplastics directly or indirectly by trophic transfer is largely unknown. Aims This study characterises microplastic abundance across intertidal water, sediment, and marine biota species of different trophic levels, and investigates whether biomagnification occurs. Methods Water, sediment, molluscs, crustaceans and fish were s led from a single area in southern Australia. Key results Microplastics were recorded in 35% of water, 45% of sediment and 39% of biota s les. Plastic load was 0.36 ± 0.08 microplastics g−1 DW for sediment, 0.50 ± 0.17 microplastics L−1 for water, and 0.70 ± 0.25 microplastics in idual−1 for biota. Biomagnification was not found, although similarities in plastic characteristics across biota may imply trophic transfer. Most of the microplastics were fibres (97.5%) of blue, black and transparent colour. Spectral analysis (μ-FTIR) indicated that polyester (50%) and polyethylene (42.3%) dominated the polymer compositions. Conclusions There were no significant differences in microplastic contamination among biota species, with no biomagnification identified. Implications We provide information on biomagnification of microplastics alongside a still uncommon characterisation of contamination in water, sediment and biota.
Otolith Biomineralisation: Insights From a Microstructural and Microanalytical Study
Publisher: Oxford University Press (OUP)
Date: 08-2014
Annual Variation in Larval Fish Assemblages in a Heavily Regulated River During Differing Hydrological Conditions
Publisher: Wiley
Date: 18-09-2016
DOI: 10.1002/RRA.2946
Approaches to resolving cephalopod movement and migration patterns
Publisher: Springer Science and Business Media LLC
Date: 16-03-2007
Spatial and habitat-related patterns of temperate reef fish assemblages: Implications for the design of Marine Protected Areas
Publisher: CSIRO Publishing
Date: 2002
DOI: 10.1071/MF01199
Abstract: Patterns of rocky reef fish assemblages (composition and relative abundance of species) were examined to provide data on the design of Marine Protected Areas (MPAs), which aim to protect these organisms. A hierarchical design was used to investigate changes in fish assemblages at scales of metres to kilometres along-shore, and among reef habitat types within two 10-km areas on the central coast of New South Wales, Australia. Influences of physical and biological attributes of a reef on assemblages of fish were also examined. The greatest variation in fish assemblages occurred at scales of 2–6 km along-shore. Eighty percent of species recorded were found within a 6-km section of coastline. The most predictable differences in assemblages were found between reef habitats (urchin-grazed barrens, Ecklonia forest and sponge habitat), and between depths. Marine Protected Areas should ideally incorporate all available habitats over the entire depth range at which they occur. This may require MPAs larger than 2–6 km, or multiple MPAs that have been specifically located to include these features, as representation of habitats was found to vary at scales of kilometres to tens of kilometres along shore.
Spatial variation in abundance of prey and diet of trumpeter (Pelates sexlineatus: Teraponidae) associated with Zostera capricorni seagrass meadows
Publisher: Wiley
Date: 04-2002
Variations in the configuration of algae in subtidal forests: Implications for invertebrate assemblages
Publisher: Wiley
Date: 26-05-2004
The spawning dynamics of snapper (Chrysophrys auratus) in northern Spencer Gulf, South Australia
Publisher: Informa UK Limited
Date: 12-2012
Multi-species response to rapid environmental change in a large estuary system: A biochronological approach
Publisher: Elsevier BV
Date: 10-2016
Impacts of Drought, Flow Regime, and Fishing on the Fish Assemblage in Southern Australia's Largest Temperate Estuary
Publisher: Springer Science and Business Media LLC
Date: 12-01-2013
Distinguishing aquaculture and wild yellowtail kingfish via natural elemental signatures in otoliths
Publisher: CSIRO Publishing
Date: 2005
DOI: 10.1071/MF04133
Abstract: Naturally occurring elemental signatures (or composition) of otoliths may enable aquaculture and wild-caught yellowtail kingfish (Seriola lalandi) to be distinguished from one another, so that in the event of aquaculture escapes, escaped fish could be identified. Yellowtail kingfish were obtained from aquaculture ventures in three regions of Spencer Gulf and from nine areas external to aquaculture throughout the inner and outer Spencer Gulf, South Australia. Elemental signatures (Mg, Mn, Sr, Ba) of otoliths were analysed via LA-ICP-MS (laser ablation-inductively coupled plasma-mass spectrometry). A highly significant difference was detected between elemental signatures of the aquaculture and wild-caught fish, but this difference was largely attributable to wild fish from Port Augusta being different from the other groupings. For in idual elements, it was difficult to detect differences between aquaculture and wild-caught fish, as there was considerable variation between locations within each group. When comparisons between aquaculture and wild fish were made of the inner and outer Spencer Gulf, aquaculture fish could be distinguished from wild fish and classified correctly with a high degree of accuracy (82–100%) the same level of accuracy was not achieved with wild fish. Comparison of elemental transects showed considerable variability between locations, with no features distinguishing aquaculture or wild-caught fish. It would be beneficial to combine naturally occurring signatures with other identification approaches (e.g. artificial elemental signatures) to accurately distinguish aquaculture from wild-caught fish. The impacts of escaped fish could then be determined.
Breeding durations as estimators of adult sex ratios and population size
Publisher: Springer Science and Business Media LLC
Date: 29-07-2010
DOI: 10.1007/S00442-010-1729-7
Abstract: Adult sex ratios (ASRs) and population size are two of the most fundamental parameters in population biology, as they are the main determinants of genetic and demographic viability, and vulnerability of a population to stochastic events. Underpinning the application of population viability analysis for predicting the extinction risk of populations is the need to accurately estimate parameters that determine the viability of populations (i.e. the ASR and population size). Here we demonstrate that a lack of temporal information can confound estimation of both parameters. Using acoustic telemetry, we compared differences in breeding durations of both sexes for a giant Australian cuttlefish Sepia apama breeding aggregation to the strongly male-biased operational sex ratio (4:1), in order to estimate the population ASR. The ratio of breeding durations between sexes was equal to the operational sex ratio, suggesting that the ASR is not strongly male-biased, but balanced. Furthermore, the short residence times of in iduals at the breeding aggregation suggests that previous density-based abundance estimates have significantly underestimated population size. With the current wide application of population viability analysis for predicting the extinction risk of populations, tools to improve the accuracy of such predictions are vital. Here we provide a new approach to estimating the fundamental ASR parameter, and call for temporal considerations when estimating population size.
Incorporation of magnesium into fish otoliths: Determining contribution from water and diet
Publisher: Elsevier BV
Date: 10-2012
Partial migration: Growth varies between resident and migratory fish
Publisher: The Royal Society
Date: 03-2015
Abstract: Partial migration occurs in many taxa and ecosystems and may confer survival benefits. Here, we use otolith chemistry data to determine whether fish from a large estuarine system were resident or migratory, and then examine whether contingents display differences in modelled growth based on changes in width of otolith growth increments. Sixty-three per cent of fish were resident based on Ba : Ca of otoliths, with the remainder categorized as migratory, with both contingents distributed across most age/size classes and both sexes, suggesting population-level bet hedging. Migrant fish were in slightly better condition than resident fish based on Fulton's K condition index. Migration type (resident versus migratory) was 56 times more likely to explain variation in growth than a model just incorporating year- and age-related growth trends. While average growth only varied slightly between resident and migratory fish, year-to-year variation was significant. Such dynamism in growth rates likely drives persistence of both life-history types. The complex relationships in growth between contingents suggest that management of species exhibiting partial migration is challenging, especially in a world subject to a changing climate.
Using elemental chemistry of fish otoliths to determine connectivity between estuarine and coastal habitats
Publisher: Elsevier BV
Date: 07-2005
Global proliferation of cephalopods
Publisher: Elsevier BV
Date: 05-2016
DOI: 10.1016/J.CUB.2016.04.002
Abstract: Human activities have substantially changed the world's oceans in recent decades, altering marine food webs, habitats and biogeochemical processes [1]. Cephalopods (squid, cuttlefish and octopuses) have a unique set of biological traits, including rapid growth, short lifespans and strong life-history plasticity, allowing them to adapt quickly to changing environmental conditions [2-4]. There has been growing speculation that cephalopod populations are proliferating in response to a changing environment, a perception fuelled by increasing trends in cephalopod fisheries catch [4,5]. To investigate long-term trends in cephalopod abundance, we assembled global time-series of cephalopod catch rates (catch per unit of fishing or s ling effort). We show that cephalopod populations have increased over the last six decades, a result that was remarkably consistent across a highly erse set of cephalopod taxa. Positive trends were also evident for both fisheries-dependent and fisheries-independent time-series, suggesting that trends are not solely due to factors associated with developing fisheries. Our results suggest that large-scale, directional processes, common to a range of coastal and oceanic environments, are responsible. This study presents the first evidence that cephalopod populations have increased globally, indicating that these ecologically and commercially important invertebrates may have benefited from a changing ocean environment.
Elements and elasmobranchs: hypotheses, assumptions and limitations of elemental analysis
Publisher: Wiley
Date: 13-11-2016
DOI: 10.1111/JFB.13189
Abstract: Quantifying the elemental composition of elasmobranch calcified cartilage (hard parts) has the potential to answer a range of ecological and biological questions, at both the in idual and population level. Few studies, however, have employed elemental analyses of elasmobranch hard parts. This paper provides an overview of the range of applications of elemental analysis in elasmobranchs, discussing the assumptions and potential limitations in cartilaginous fishes. It also reviews the available information on biotic and abiotic factors influencing patterns of elemental incorporation into hard parts of elasmobranchs and provides some comparative elemental assays and mapping in an attempt to fill knowledge gaps. Directions for future experimental research are highlighted to better understand fundamental elemental dynamics in elasmobranch hard parts.
Impacts of seawater desalination on the giant Australian cuttlefish Sepia apama in the upper Spencer Gulf, South Australia
Publisher: Elsevier BV
Date: 05-2009
DOI: 10.1016/J.MARENVRES.2009.02.002
Abstract: With seawater desalination expanding rapidly, it is important that ecological studies are undertaken to determine the effects of brine discharge on the marine species in the area. The abundance of giant Australian cuttlefish (Sepia apama, Gray 1849) eggs and environmental data were recorded at nine sites near Point Lowly, Spencer Gulf, South Australia, an area where the largest desalination plant in the Southern hemisphere is proposed. In addition, the effects of different concentrations of desalination brine on the growth, survival and condition of cuttlefish embryos were investigated. The primary egg-laying sites for the cuttlefish were in the vicinity of Stony Point (sites 4 and 3) and the area with the least egg abundance was on the eastern and western areas around Point Lowly (sites 9 and 7) where no eggs were found. The survival of embryos decreased with an increase in salinity, with no embryos surviving to full term in salinities greater than 50 per thousand. Mean weight and mantle length also decreased with increasing salinity. Besides elevated salinity, the brine also had increased concentrations of Ba, Ca, K, Sr and Mg relative to water near Point Lowly. Brine discharge from seawater desalination poses a potential threat to the unique spawning aggregation of the giant Australian cuttlefish, in the upper Spencer Gulf, South Australia.
Metabolic effects on carbon isotope biomarkers in fish
Publisher: Elsevier BV
Date: 02-2019
Diving into the vertical dimension of elasmobranch movement ecology.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 19-08-2022
Abstract: Knowledge of the three-dimensional movement patterns of elasmobranchs is vital to understand their ecological roles and exposure to anthropogenic pressures. To date, comparative studies among species at global scales have mostly focused on horizontal movements. Our study addresses the knowledge gap of vertical movements by compiling the first global synthesis of vertical habitat use by elasmobranchs from data obtained by deployment of 989 biotelemetry tags on 38 elasmobranch species. Elasmobranchs displayed high intra- and interspecific variability in vertical movement patterns. Substantial vertical overlap was observed for many epipelagic elasmobranchs, indicating an increased likelihood to display spatial overlap, biologically interact, and share similar risk to anthropogenic threats that vary on a vertical gradient. We highlight the critical next steps toward incorporating vertical movement into global management and monitoring strategies for elasmobranchs, emphasizing the need to address geographic and taxonomic biases in deployments and to concurrently consider both horizontal and vertical movements.
Innate response to first feeding in Octopus berrima hatchlings despite embryonic food imprinting
Publisher: Brill
Date: 27-06-2023
DOI: 10.1163/1568539X-BJA10227
Abstract: Food imprinting has both ecological and evolutionary significance but the generality of these patterns for octopods remains unknown. We aim to determine the prey preference of Octopus berrima hatchlings and whether it may be modified through imprinting. Firstly, hatchlings were given isopods, hipods and mussels to determine their prey preference ranking. In a separate experiment, embryos were exposed to the visual and chemical stimuli of either isopods, hipods or mussels separately at least a week before hatching. A prey preference test on hatchlings using all three prey types was conducted. We found that O. berrima had a preference ranking of isopods hipods mussels. However, they retained their isopod prey preference regardless of the prey type they were embryonically exposed to, indicating that it is likely pre-determined as a result of innate biological processes rather than from life experience, providing evidence that imprinting does not occur in O. berrima .
Exploiting the innate behaviour of common carp, Cyprinus carpio, to limit invasion and spawning in wetlands of the River Murray, Australia
Publisher: Wiley
Date: 28-10-2016
DOI: 10.1111/FME.12184
Optimising exclusion screens to control exotic carp in an Australian lowland river
Publisher: CSIRO Publishing
Date: 2010
DOI: 10.1071/MF09017
Abstract: Carp exclusion screens (CES) are used to restrict adult common carp from entering wetlands, thereby minimising their ecological impacts and spawning and recruitment potential, but there is marked variation in current CES design and management. We quantified current CES designs, dimensions and locations within the Murray–Darling Basin, Australia. Directional fyke nets at inlets of six permanently inundated wetlands were used to identify fish using wetlands and therefore potentially vulnerable to CES. Morphometric data from captured fish were then used to design CES that excluded sexually mature carp. The ability of optimised and existing CES designs to exclude large-bodied fishes that used wetlands was then assessed. Fifty-four CES with eight mesh designs and varied dimensions were identified. We recorded 18 species comprising 212 927 fish in the wetland inlets. Two optimised meshes to exclude sexually mature carp were developed: a 44-mm square grid mesh and a ‘jail bar’ mesh with 31.4-mm gaps. Modelling revealed that up to 92% of carp could be excluded by either optimised mesh design, although few young-of-year carp were caught. Optimised and existing CES designs would also exclude 2–65% of large-bodied native fishes. Optimised CES may allow localised carp control without restricting passage of some key native fishes.
Predicting sustainable shark harvests when stock assessments are lacking
Publisher: Oxford University Press (OUP)
Date: 22-03-2018
Abstract: Effective fisheries management generally requires reliable data describing the target species’ life-history characteristics, the size of its harvested populations, and overall catch estimates, to set sustainable quotas and management regulations. However, stock assessments are often not available for long-lived marine species such as sharks, making predictions of the long-term population impacts of variable catch rates difficult. Fortunately, stage- or age-structured population models can assist if sufficient information exists to estimate survival and fertility rates. Using data collected from the bronze whaler (Carcharhinus brachyurus) fishery in South Australia as a case study, we estimated survival probabilities from life tables of harvested in iduals, as well as calculated natural mortalities based on allometric predictions. Fertility data (litter size, proportion mature) from previous studies allowed us to build a fertility vector. Deterministic matrices built using estimates of life-table data or natural mortality (i.e. harvested-augmented and natural mortality) produced instantaneous rates of change of 0.006 and 0.025, respectively. Assuming an incrementing total catch at multiples of current rates, stochastic simulations suggest the relative rate of population decline starts to become precipitous around 25% beyond current harvest rates. This is supported by a sharp increase in weighted mean age of the population around 25% increase on current catches. If the catch is assumed to be proportional (i.e. a constant proportion of the previous year’s population size), the relative r declines approximately linearly with incrementing harvest beyond the current rate. A global sensitivity analysis based on a Latin-hypercube s ling design of seven parameters revealed that variation in the survival estimates derived from the life tables was by far the dominant (boosted-regression tree relative influence score = 91.14%) determinant of model performance (measured as variation in the long-term average rate of population change r). While current harvest rates therefore appear to be sustainable, we recommend that fisheries-management authorities attempt to s le a broader size range of in iduals (especially older animals) and pursue stock assessments. Our models provide a framework for assessing the relative susceptibility of long-lived fishes to harvest pressure when detailed stock data are missing.
Integrated approach to determining stock structure: implications for fisheries management of sardine, Sardinops sagax, in Australian waters
Publisher: Springer Science and Business Media LLC
Date: 27-01-2017
Using a biophysical model to investigate connectivity between spawning grounds and nursery areas of King George whiting (Sillaginodes punctatus: Perciformes) in South Australia’s gulfs
Publisher: Wiley
Date: 17-09-2020
DOI: 10.1111/FOG.12502
Size at maturity and seasonal changes in gonad activity of yellowtail kingfish(Seriola lalandi;Carangidae) in New South Wales, Australia
Publisher: Informa UK Limited
Date: 09-1999
Variation in Telomere Length of the Common Carp, Cyprinus carpio (Cyprinidae), in Relation to Body Length
Publisher: American Society of Ichthyologists and Herpetologists (ASIH)
Date: 03-2014
DOI: 10.1643/CI-11-162
A meta-analysis of multiple stressors on seagrasses in the context of marine spatial cumulative impacts assessment
Publisher: Springer Science and Business Media LLC
Date: 20-07-2020
DOI: 10.1038/S41598-020-68801-W
Abstract: Humans are placing more strain on the world’s oceans than ever before. Furthermore, marine ecosystems are seldom subjected to single stressors, rather they are frequently exposed to multiple, concurrent stressors. When the combined effect of these stressors is calculated and mapped through cumulative impact assessments, it is often assumed that the effects are additive. However, there is increasing evidence that different combinations of stressors can have non-additive impacts, potentially leading to synergistic and unpredictable impacts on ecosystems. Accurately predicting how stressors interact is important in conservation, as removal of certain stressors could provide a greater benefit, or be more detrimental than would be predicted by an additive model. Here, we conduct a meta-analysis to assess the prevalence of additive, synergistic, and antagonistic stressor interaction effects using seagrasses as case study ecosystems. We found that additive interactions were the most commonly reported in seagrass studies. Synergistic and antagonistic interactions were also common, but there was no clear way of predicting where these non-additive interactions occurred. More studies which synthesise the results of stressor interactions are needed to be able to generalise interactions across ecosystem types, which can then be used to improve models for assessing cumulative impacts.
Patterns of abundance and size structure in the blue groper, Achoerodus viridis (Pisces, Labridae): evidence of links between estuaries and coastal reefs
Publisher: Springer Science and Business Media LLC
Date: 06-1997
Age‐related movement patterns and population structuring in southern garfish, Hyporhamphus melanochir, inferred from otolith chemistry
Publisher: Wiley
Date: 09-07-1970
Interactive effects of food quality, temperature and rearing time on condition of juvenile black bream Acanthopagrus butcheri
Publisher: Wiley
Date: 18-05-2010
DOI: 10.1111/J.1095-8649.2010.02632.X
Abstract: A laboratory experiment was conducted to determine the interactive effects of temperature and diet on condition indices of juvenile black bream Acanthopagrus butcheri, reared for time periods ranging from 2 to 42 days. After fish were reared for varying periods, growth, morphometric (Fulton's K) and biochemical [RNA:DNA (R:D) ratios] indices were measured. Fulton's K responded primarily to temperature, with progressive decrease in condition over time for fish reared at high temperatures. In contrast, R:D ratios were primarily affected by diet composition, with the highest values observed for fish reared on fish-based diets as opposed to vegetable-based diets. Significant effects of rearing time were also observed for Fulton's K and R:D ratios, as were some interactive treatment effects. In addition, Fulton's K and R:D ratios were not significantly correlated, perhaps due to the different periods of time integrated by each index or their relative sensitivity to lipid and protein deposition. These results highlight the complex responses of these condition indices to environmental variables and nutritional status.
Reconciling differences in natural tags to infer demographic and genetic connectivity in marine fish populations
Publisher: Springer Science and Business Media LLC
Date: 09-07-2018
DOI: 10.1038/S41598-018-28701-6
Abstract: Processes regulating population connectivity are complex, ranging from extrinsic environmental factors to intrinsic in idual based features, and are a major force shaping the persistence of fish species and population responses to harvesting and environmental change. Here we developed an integrated assessment of demographic and genetic connectivity of European flounder Platichthys flesus in the northeast Atlantic (from the Norwegian to the Portuguese coast) and Baltic Sea. Specifically, we used a Bayesian infinite mixture model to infer the most likely number of natal sources of in iduals based on otolith near core chemical composition. Simultaneously, we characterised genetic connectivity via microsatellite DNA markers, and evaluated how the combined use of natural tags informed in idual movement and long-term population exchange rates. In idual markers provided different insights on movement, with otolith chemistry delineating Norwegian and Baltic Sea sources, whilst genetic markers showed a latitudinal pattern which distinguished southern peripheral populations along the Iberian coast. Overall, the integrated use of natural tags resulted in outcomes that were not readily anticipated by in idual movement or gene flow markers alone. Our ecological and evolutionary approach provided a synergistic view on connectivity, which will be paramount to align biological and management units and safeguard species’ biocomplexity.
Variation in the strength of continental boundary currents determines continent-wide connectivity in kelp
Publisher: Wiley
Date: 17-03-2011
Culture-Level Dimensions of Social Axioms and Their Correlates across 41 Cultures
Publisher: SAGE Publications
Date: 09-2004
Abstract: Leung and colleagues have revealed a five-dimensional structure of social axioms across in iduals from five cultural groups. The present research was designed to reveal the culture level factor structure of social axioms and its correlates across 41 nations. An ecological factor analysis on the 60 items of the Social Axioms Survey extracted two factors: Dynamic Externality correlates with value measures tapping collectivism, hierarchy, and conservatism and with national indices indicative of lower social development. Societal Cynicism is less strongly and broadly correlated with previous values measures or other national indices and seems to define a novel cultural syndrome. Its national correlates suggest that it taps the cognitive component of a cultural constellation labeled maleficence, a cultural syndrome associated with a general mistrust of social systems and other people. Discussion focused on the meaning of these national level factors of beliefs and on their relationships with in idual level factors of belief derived from the same data set.
The response of encrusting coralline algae to canopy loss: an independent test of predictions on an Antarctic coast
Publisher: Springer Science and Business Media LLC
Date: 09-07-2005
Contribution of water chemistry and fish condition to otolith chemistry: Comparisons across salinity environments
Publisher: Wiley
Date: 06-2015
DOI: 10.1111/JFB.12672
Abstract: This study quantified the per cent contribution of water chemistry to otolith chemistry using enriched stable isotopes of strontium ((86) Sr) and barium ((137) Ba). Euryhaline barramundi Lates calcarifer, were reared in marine (salinity 40), estuarine (salinity 20) and freshwater (salinity 0) under different temperature treatments. To calculate the contribution of water to Sr and Ba in otoliths, enriched isotopes in the tank water and otoliths were quantified and fitted to isotope mixing models. Fulton's K and RNA:DNA were also measured to explore the influence of fish condition on sources of element uptake. Water was the predominant source of otolith Sr (between 65 and 99%) and Ba (between 64 and 89%) in all treatments, but contributions varied with temperature (for Ba), or interactively with temperature and salinity (for Sr). Fish condition indices were affected independently by the experimental rearing conditions, as RNA:DNA differed significantly among salinity treatments and Fulton's K was significantly different between temperature treatments. Regression analyses did not detect relations between fish condition and per cent contribution values. General linear models indicated that contributions from water chemistry to otolith chemistry were primarily influenced by temperature and secondly by fish condition, with a relatively minor influence of salinity. These results further the understanding of factors that affect otolith element uptake, highlighting the necessity to consider the influence of environment and fish condition when interpreting otolith element data to reconstruct the environmental histories of fish.
Introgressive hybridisation between two widespread sharks in the east Pacific region
Publisher: Elsevier BV
Date: 07-2019
DOI: 10.1016/J.YMPEV.2019.04.013
Abstract: With just a handful of documented cases of hybridisation in cartilaginous fishes, shark hybridisation remains poorly investigated. Small amounts of admixture have been detected between Galapagos (Carcharhinus galapagensis) and dusky (Carcharhinus obscurus) sharks previously, generating a hypothesis of ongoing hybridisation. We s led a large number of in iduals from areas where the species co-occur (contact zones) across the Pacific Ocean and used both mitochondrial and nuclear-encoded SNPs to examine genetic admixture and introgression between the two species. Using empirical analytical approaches and simulations, we first developed a set of 1873 highly informative SNPs for these two species to evaluate the degree of admixture between them. Overall, results indicate a high discriminatory power of nuclear SNPs (F
Determining reproductive parameters for population assessments of chondrichthyan species with asynchronous ovulation and parturition: piked spurdog (Squalus megalops) as a case study
Publisher: CSIRO Publishing
Date: 2006
DOI: 10.1071/MF05076
Abstract: Population assessments of chondrichthyan species require several key parameters of their reproductive biology, which were estimated for Squalus megalops (Macleay, 1881). Length-at-maturity differed depending on the criterion adopted for defining maturity. In the case of males, length-at-maturity was smallest when condition of seminal vesicles was adopted as a maturity criterion. For females, length-at-maturity was smallest when the largest follicle diameter mm was adopted as the criterion for maturity this was appropriate only as an indicator of the onset of maturity. Mature males are capable of mating throughout the year. Females have a continuous asynchronous reproductive cycle. The sex ratio of embryos is 1 : 1 and litter size and near-term embryo length increase with maternal length. Females have an ovarian cycle and gestation period of two years. This was reflected in the differences found between the maturity and maternity ogives. Although all females are mature at 600 mm, only 50% of them contribute to annual recruitment each year. Hence, for chondrichthyan species with reproductive cycles of two, three or more years, if maturity ogives are used in population assessments instead of maternity ogives, the models will overestimate recruitment rates.
Marine nurseries and effective juvenile habitats: concepts and applications
Publisher: Inter-Research Science Center
Date: 24-04-2006
DOI: 10.3354/MEPS312291
Estimates of movement and life-history parameters of yellowtail kingfish (Seriola lalandi): how useful are data from a cooperative tagging programme?
Publisher: CSIRO Publishing
Date: 2001
DOI: 10.1071/MF99153
Abstract: Tag—recapture data for kingfish obtained from a cooperative tagging programme were used to assess the usefulness of such information for estimating movement and life-history parameters. Numbers tagged and recaptured varied among fishing zones, seasons and years. Recapture rates varied among areas, fishers and sizes of fish. Small fish showed less movement than large fish, but few fish mm TL were tagged. The majority of fish were recaptured within 50 km of where they were tagged, although there was an indication that fish that were at large longer moved further. The maximum distance moved was 3000 km and the maximum time at liberty was 1742 days. Quantitative analyses of life-history parameters from data collected in cooperative tagging programmes are generally not possible because there are usually no estimates of fishing effort, tag-related mortality and tag loss. These are likely to vary not only along the coast, but also among taggers. Cooperative tagging programmes provide some useful biological data (e.g.movement from point x to point y , and growth), but dedicated tagging programmes may be needed for estimates of other life-history parameters (e.g.mortality) and of abundance.
Seasonal Variation in Standing Crop, Reproduction and Population Structure of Xiphophora gladiata (Phaeophyceae: Fucales)
Publisher: Walter de Gruyter GmbH
Date: 1994
Determining climate-growth relationships in a temperate fish: A sclerochronological approach
Publisher: Elsevier BV
Date: 02-2017
Mechanisms of Population Structuring in Giant Australian Cuttlefish Sepia apama
Publisher: Public Library of Science (PLoS)
Date: 11-03-2013
Using genomics and morphometrics to monitor data-poor and commercially exploited octopod populations
Publisher: Springer Science and Business Media LLC
Date: 26-08-2023
DOI: 10.1007/S00227-023-04270-9
Abstract: Over 150 species of benthic octopods have been described within the ‘catch-all’ Octopus genus (Family: Octopodidae) and yet, many Octopus species harvested by fisheries remain unidentified to species-level due to a lack of distinguishing traits. Within species, there is also limited information on how populations differ genetically and the level of connectivity between populations. Therefore, we s led octopods from commercial fisheries in southeast Australia, in order to identify the species, examine the phylogeographic relationships among species and the level of population genetic structuring within species, as well as to look for any adaptive genetic variation. The mitochondrial gene, cytochrome oxidase subunit III (COIII), was sequenced in 346 octopods along with single nucleotide polymorphisms using double digest restriction site-associated DNA sequencing (ddRADseq). Morphometric traits were also measured in mature specimens. The southern keeled octopus ( ‘Octopus’ berrima ) and pale octopus ( ‘Octopus’ pallidus ) were identified using COIII data. For ‘Octopus’ berrima , we found that some populations whilst being morphologically similar were genetically distinct. In contrast, ‘Octopus’ pallidus populations were both morphologically and genetically distinct across the studied regions. Our results provide key information to better inform conservation and management decisions for developing octopod fisheries in southeast Australia and highlight the importance of genomics tools in the conservation management of commercially and recreationally important species.
Elevated carbon dioxide and temperature affects otolith development, but not chemistry, in a diadromous fish
Publisher: Elsevier BV
Date: 10-2017
Interpreting diel activity patterns from acoustic telemetry: the need for controls
Publisher: Inter-Research Science Center
Date: 30-11-2010
DOI: 10.3354/MEPS08864
A tree-ring based reconstruction of early summer precipitation in southwestern Virginia (1750–1981)
Publisher: Inter-Research Science Center
Date: 31-08-2015
DOI: 10.3354/CR01315
Relationships between taxonomic resolution and spatial scales of multivariate variation
Publisher: Wiley
Date: 23-06-2005
Environmental Water Allocations in regulated lowland rivers may encourage offstream movements and spawning by common carp, Cyprinus carpio: implications for wetland rehabilitation
Publisher: CSIRO Publishing
Date: 2012
DOI: 10.1071/MF12044
Abstract: Environmental Water Allocations (EWAs) are used to enhance native flora and fauna in regulated rivers, but may also benefit alien invasive species like common carp (Cyprinus carpio). We examined the invasion and spawning risk posed by adult common carp during an EWA delivered from the River Murray to a flow-through wetland in South Australia from June to December 2008. Offstream movements of fish and turtles were monitored continuously via the inlet and outlet creeks. Long-necked turtles (Chelodina longicollis, n = 129) dominated at the inlet where few fish were collected (n = 24), whereas much larger numbers of common carp in prime spawning condition (n = 4709), alien goldfish (Carassius auratus, n = 1201) and native bony herring (Nematalosa erebi, n = 93) were attracted to the outlet and displayed distinct movements. Adult common carp movements began in August, in response to increasing water temperatures, peaked in mid-September before spawning, then declined and were close to zero by December. The timing of EWA deliveries potentially could be manipulated to reduce adult carp invasion and spawning potential while providing some advantage to native fish, but the benefits may be short-lived without additional carp management interventions such as wetland drying.
Total and partial length–length, mass–mass and mass–length relationships for the piked spurdog (Squalus megalops) in south-eastern Australia
Publisher: Elsevier BV
Date: 05-2006
Tools for Studying Biological Marine Ecosystem Interactions—Natural and Artificial Tags
Publisher: Springer Netherlands
Date: 2009
Eight habitats, 38 threats and 55 experts: Assessing ecological risk in a multi-use marine region
Publisher: Public Library of Science (PLoS)
Date: 10-05-2017
Otolith chemistry to determine movements of diadromous and freshwater fish
Publisher: EDP Sciences
Date: 07-2005
DOI: 10.1051/ALR:2005033
Testing hypoxia: physiological effects of long-term exposure in two freshwater fishes
Publisher: Springer Science and Business Media LLC
Date: 06-11-2017
DOI: 10.1007/S00442-017-3992-3
Abstract: Hypoxic or oxygen-free zones are linked to large-scale mortalities of fauna in aquatic environments. Studies investigating the hypoxia tolerance of fish are limited and focused on marine species and short-term exposure. However, there has been minimal effort to understand the implications of long-term exposure on fish and their ability to acclimate. To test the effects of long-term exposure (months) of fish to hypoxia we devised a novel method to control the level of available oxygen. Juvenile golden perch (Macquaria ambigua ambigua), and silver perch (Bidyanus bidyanus), two key native species found within the Murray Darling Basin, Australia, were exposed to different temperatures (20, 24 and 28 °C) combined with normoxic (6-8 mgO
Facilitation of barium uptake into fish otoliths: Influence of strontium concentration and salinity
Publisher: Elsevier BV
Date: 08-2005
The effects of temperature and salinity on otolith chemistry of King George whiting
Publisher: Elsevier BV
Date: 12-2017
Dietary generalism accelerates arrival and persistence of coral-reef fishes in their novel ranges under climate change
Publisher: Wiley
Date: 24-07-2020
DOI: 10.1111/GCB.15221
Long-term patterns in estuarine fish growth across two climatically divergent regions
Publisher: Springer Science and Business Media LLC
Date: 06-08-2015
DOI: 10.1007/S00442-015-3411-6
Abstract: Long-term ecological datasets are vital for investigating how species respond to changes in their environment, yet there is a critical lack of such datasets from aquatic systems. We developed otolith growth 'chronologies' to reconstruct the growth history of a temperate estuarine fish species, black bream (Acanthopagrus butcheri). Chronologies represented two regions in south-east Australia: South Australia, characterised by a relatively warm, dry climate, and Tasmania, characterised by a relatively cool, wet climate. Using a mixed modelling approach, we related inter-annual growth variation to air temperature, rainfall, freshwater inflow (South Australia only), and El Niño-Southern Oscillation events. Otolith chronologies provided a continuous record of growth over a 13- and 21-year period for fish from South Australia and Tasmania, respectively. Even though fish from Tasmania were sourced across multiple estuaries, they showed higher levels of growth synchronicity across years, and greater year-to-year growth variation, than fish from South Australia, which were sourced from a single, large estuary. Growth in Tasmanian fish declined markedly over the time period studied and was negatively correlated to temperature. In contrast, growth in South Australian fish was positively correlated to both temperature and rainfall. The stark contrast between the two regions suggests that Tasmanian black bream populations are more responsive to regional scale environmental variation and may be more vulnerable to global warming. This study highlights the importance of examining species response to climate change at the intra-specific level and further validates the emerging use of growth chronologies for generating long-term ecological data in aquatic systems.
Extensive drought negates human influence on nutrients and water quality in estuaries
Publisher: Elsevier BV
Date: 04-2009
DOI: 10.1016/J.SCITOTENV.2009.01.012
Abstract: Impacts of land-use on estuarine environmental parameters and nutrients are well documented, but little is known about these characteristics during extensive periods of low water flow (i.e., drought). Droughts are set to increase in frequency and magnitude with climate change, and understanding their influence on ecosystems is imperative. We investigated differences in environmental parameters and nutrients in urban and rural estuaries during a period of prolonged low flow. S ling was done along each estuary at multiple times to place small-scale variability in the context of land-use differences. No differences were detected between land-use for environmental parameters or nutrients in mean effects or variance structure. Urban estuaries had reduced variation in nutrients over time compared to rural estuaries, which suggested that their concentrations are more stable. Large differences existed within and between in idual estuaries, and over time. Low freshwater flow conditions in estuaries provide a glimpse to future climate change impacts of drought, and a baseline upon which pollution and anthropogenic effects can be assessed.
Variation at local scales need not impede tests for broader scale patterns
Publisher: Springer Science and Business Media LLC
Date: 11-05-2005
'Neo-Europe' and its ecological consequences: The example of systematic degradation in Australia's inland fisheries
Publisher: The Royal Society
Date: 2016
Abstract: The antiquity of human impact on ecosystems is increasingly understood, though the arrival of settlers to new lands remains a defining period. Colonization of the ‘neo-Europes’, a reference from the discipline of history, precipitated changes in aquatic ecosystems through modification of waterways and introductions of non-native species. We considered historical fisheries and fish market records from South Australia (1900–1946) against contemporary production statistics (1987–2011). Native inland species historically contributed large quantities to the market but have deteriorated such that fishing is now limited, and conservation regulations exist. This pattern mirrors the demand-driven transition from freshwater to marine fisheries in Europe hence, we propose that this pattern was predicated on societal expectations and that European settlement and introduction of non-native fishes led to systematic overexploitation and degradation of native inland fisheries species in Australia, representing a further consequence of neo-European colonization to ecology. Accurate interpretation of ecological change can ensure more appropriate management intervention. Concepts, such as neo-Europe, from alternative disciplines can inform the recognition and evaluation of patterns at regional and global scales.
Assemblages of fish along a mangrove - mudflat gradient in temperate Australia
Publisher: CSIRO Publishing
Date: 2009
DOI: 10.1071/MF08124
Abstract: Mangroves are considered to support rich assemblages of fish and invertebrates. Fishes inhabiting mangrove habitats and at various distances from mangroves across mudflats were s led to: (1) compare fish assemblages between habitats and (2) determine the influence of mangrove proximity on fish abundance and ersity in three southern Australian estuaries between November 2005 and January 2006. Based on their distribution, fish species were classified as mangrove residents, mudflat residents, generalists or rare species. The assemblage structure of fish in mangroves differed from assemblages 500 m away however, neither total abundance nor species richness differed significantly between mangroves and mudflats. Mangrove residents and Aldrichetta forsteri (yellow-eyed mullet) displayed strong associations with mangrove habitats, whereas mudflat residents were associated with mudflat habitats. No other fish groups or in idual species occurred in higher abundances in either habitat. Total fish abundance, mangrove residents and A. forsteri were positively correlated with pneumatophore density, indicating that the structural complexity of the mangroves might influence the distributions of certain fish species. The current study demonstrated that mangrove habitats in temperate Australia support no greater abundance or ersity of fish than adjacent mudflat habitats and that mangrove proximity does not influence fish distribution at a habitat scale.
Hypersaline waters pose new challenges for reconstructing environmental histories of fish based on otolith chemistry
Publisher: Wiley
Date: 07-2012
Predicting sustainable shark harvests when stock assessments are lacking
Publisher: Oxford University Press (OUP)
Date: 13-07-2018
Comparison of deterministic growth models fitted to length-at-age data of the piked spurdog (Squalus megalops) in south-eastern Australia
Publisher: CSIRO Publishing
Date: 2007
DOI: 10.1071/MF06064
Abstract: Age and growth estimates of Squalus megalops were derived from the first dorsal fin spine of 452 sharks, ranging from 274 to 622 mm total length. Age bias plots and indices of precision indicated that the ageing method was precise and unbiased. Edge analysis of the enameled surface of whole spines and similarities in the banding pattern deposited in the enameled surface of spines and in spine sections supported the hypothesis of annual band formation. Multiple versions of two growth models were fitted to length-at-age data, from which a two-phase von Bertalanffy model produced the best fit. For males, the change in growth rate corresponded with size-at-maturity, whereas for females, the change was slightly before size-at-maturity. Regardless of the growth model used, growth rate of females (0.034 to 0.098 years–1) was very low, making S. megalops highly susceptible to overexploitation by fisheries.
Experimental support towards a metabolic proxy in fish using otolith carbon isotopes
Publisher: The Company of Biologists
Date: 15-03-2020
DOI: 10.1242/JEB.217091
Abstract: Metabolic rate underpins our understanding of how species survive, reproduce and interact with their environment, but can be difficult to measure in wild fish. Stable carbon isotopes (δ13C) in ear stones (otoliths) of fish may reflect lifetime metabolic signatures but experimental validation is required to advance our understanding of the relationship. To this end, we reared juvenile Australasian snapper (Chrysophrys auratus), an iconic fishery species, at different temperatures and used intermittent-flow respirometry to calculate standard metabolic rate (SMR), maximum metabolic rate (MMR) and absolute aerobic scope (AAS). Subsequently, we analysed δ13C and oxygen isotopes (δ18O) in otoliths using isotope-ratio mass spectrometry. We found that under increasing temperatures, δ13C and δ18O significantly decreased, while SMR and MMR significantly increased. Negative logarithmic relationships were found between δ13C in otoliths and both SMR and MMR, while exponential decay curves were observed between proportions of metabolically sourced carbon in otoliths (Moto) and both measured and theoretical SMR. We show that basal energy for subsistence living and activity metabolism, both core components of field metabolic rates, contribute towards incorporation of δ13C into otoliths and support the use of δ13C as a metabolic proxy in field settings. The functional shapes of the logarithmic and exponential decay curves indicated that physiological thresholds regulate relationships between δ13C and metabolic rates due to upper thresholds of Moto. Here, we present quantitative experimental evidence to support the development of an otolith-based metabolic proxy, which could be a powerful tool in reconstructing lifetime biological trends in wild fish.
Relationship between otolith chemistry and age in a widespread pelagic teleost Arripis trutta: influence of adult movements on stock structure and implications for management
Publisher: CSIRO Publishing
Date: 2016
DOI: 10.1071/MF14247
Abstract: This study investigated how the stock structure of Arripis trutta is influenced by the movement of adult fish. Five-year-old fish were s led from four regions in south-east Australia encompassing ~1500km of coastline. Transverse otolith sections were analysed using laser-ablation inductively coupled plasma-mass spectrometry, providing age-related elemental profiles. Multivariate analyses showed that for most age groups, the elemental fingerprint of northern New South Wales (NSW) fish was significantly different from those of the other locations. Northern NSW fish also had a different fingerprint from those of all other locations for the first part of the fish’s life. These results indicate that most A. trutta originate in southern NSW, Victoria and Tasmania and move progressively northward with increasing age. Some recruitment occurs in northern NSW but these fish may not mix with immigrants from further south until they are more than 5 years old. When assessed with the strong latitudinal age gradient of the population, these data are consistent with a single, panmictic stock. The data also highlight the utility of otolith transect analysis in understanding the influence of age-related movements on stock structure and appropriate spatial management of exploited fish species.
Transgenerational marking of freshwater fishes with enriched stable isotopes: A tool for fisheries management and research
Publisher: Wiley
Date: 08-2009
DOI: 10.1111/J.1095-8649.2009.02352.X
Abstract: A promising new method of marking larval freshwater fishes with enriched stable isotopes by means of injecting the maternal parent with the marking agent was investigated. The (138)Ba:(137)Ba ratios in the otoliths of larval golden perch Macquaria ambigua were compared to determine the effect of injecting female broodstock with different dosages of enriched (137)Ba at various times before spawning. There was 100% mark success in the progeny of fish injected with 20 microg g(-1) of enriched (137)Ba 24 h before inducing spawning with hormones and 40 microg g(-1) administered at the same time as inducement of spawning. Injection of 40 microg g(-1) enriched (137)Ba 21 days before spawning resulted in only 81% mark success and suggests rapid elimination of barium in M. ambigua. Injection with enriched (137)Ba did not significantly affect the fertilization rate, number of fertilized eggs or hatching rate compared with long-term hatchery records. These results suggest that transgenerational marking is an effective and affordable means of mass-marking larval fishes. Thousands of larval fishes can be permanently marked with a unique artificial isotopic mark via a single injection into the maternal parent, thus avoiding the handling of in idual fishes or having to deal with chemical baths. Because no single mark or tagging method is suitable for all situations, transgenerational marking with enriched stable isotopes provides another method for researchers and managers to discriminate both hatchery-reared and wild fishes.
Towards vibrant fish populations and sustainable fisheries that benefit all: learning from the last 30 years to inform the next 30 years
Publisher: Springer Science and Business Media LLC
Date: 04-03-2023
Connectivity of Estuaries
Publisher: Elsevier
Date: 2012
Nutrients increase epiphyte loads: Broad-scale observations and an experimental assessment
Publisher: Springer Science and Business Media LLC
Date: 15-02-2005
A targeted capture approach to generating reference sequence databases for chloroplast gene regions
Publisher: Wiley
Date: 04-2022
DOI: 10.1002/ECE3.8816
Abstract: Metabarcoding has improved the way we understand plants within our environment, from their ecology and conservation to invasive species management. The notion of identifying plant taxa within environmental s les relies on the ability to match unknown sequences to known reference libraries. Without comprehensive reference databases, species can go undetected or be incorrectly assigned, leading to false‐positive and false‐negative detections. To improve our ability to generate reference sequence databases, we developed a targeted capture approach using the OZBaits_CP V1.0 set, designed to capture chloroplast gene regions across the entirety of flowering plant ersity. We focused on generating a reference database for coastal temperate plant species given the lack of reference sequences for these taxa. Our approach was successful across all specimens with a target gene recovery rate of 92%, which was achieved in a single assay (i.e., s les were pooled), thus making this approach much faster and more efficient than standard barcoding. Further testing of this database highlighted 80% of all s les could be discriminated to family level across all gene regions with some genes achieving greater resolution than others—which was also dependent on the taxon of interest. Thus, we demonstrate the importance of generating reference sequences across multiple chloroplast gene regions as no single loci are sufficient to discriminate across all plant groups. The targeted capture approach outlined in this study provides a way forward to achieve this.
Identifying migratory contingents of fish by combining otolith Sr:Ca with temporal collections of ambient Sr:Ca concentrations
Publisher: Wiley
Date: 16-08-2006
Stock discrimination of Southern Garfish (Hyporhamphus melanochir) by stable isotope ratio analysis of otolith aragonite
Publisher: Springer Science and Business Media LLC
Date: 18-06-2010
Do fish remains provide reliable palaeoenvironmental records? An examination of the effects of cooking on the morphology and chemistry of fish otoliths, vertebrae and scales
Publisher: Elsevier BV
Date: 10-2016
Resolving the early life history of King George whiting (Sillaginodes punctatus: Perciformes) using otolith microstructure and trace element chemistry
Publisher: CSIRO Publishing
Date: 2019
DOI: 10.1071/MF18280
Abstract: Understanding the early life history processes of fish that lead to recruitment is critical for understanding population dynamics. This study explored the early life history of King George whiting (Sillaginodes punctatus) that recruited to an important nursery area in South Australia in 2016 and 2017. The early life history was reconstructed based on the retrospective analysis of otolith microstructure and chemistry for settlement-stage larvae collected fortnightly from July to November. These fish hatched between March and July, but a 3-week period in May led to 52–71% of recruitment. Recruits from successive s ling occasions differed in age, size and growth rate, potentially related to seasonal changes in water temperature and larval food availability. During both years, there were significant changes in otolith elemental chemistry among the groups of recruits that primarily related to changes in Sr:Ca. There are two hypotheses to account for the differences in otolith chemistry: either (1) a single, primary spawning source and within-season environmental change or (2) multiple spawning sources. Further investigation with oceanographic models of larval dispersal will help differentiate between these. The retrospective analysis of otoliths has improved the understanding of early life history for this important species, with implications for fishery management.
Capturing expert uncertainty in spatial cumulative impact assessments /631/158 /631/158/2445 article
Publisher: Springer Science and Business Media LLC
Date: 23-01-2018
DOI: 10.1038/S41598-018-19354-6
Abstract: Understanding the spatial distribution of human impacts on marine environments is necessary for maintaining healthy ecosystems and supporting ‘blue economies’. Realistic assessments of impact must consider the cumulative impacts of multiple, coincident threats and the differing vulnerabilities of ecosystems to these threats. Expert knowledge is often used to assess impact in marine ecosystems because empirical data are lacking however, this introduces uncertainty into the results. As part of a spatial cumulative impact assessment for Spencer Gulf, South Australia, we asked experts to estimate score ranges (best-case, most-likely and worst-case), which accounted for their uncertainty about the effect of 32 threats on eight ecosystems. Expert scores were combined with data on the spatial pattern and intensity of threats to generate cumulative impact maps based on each of the three scoring scenarios, as well as simulations and maps of uncertainty. We compared our method, which explicitly accounts for the experts’ knowledge-based uncertainty, with other approaches and found that it provides smaller uncertainty bounds, leading to more constrained assessment results. Collecting these additional data on experts’ knowledge-based uncertainty provides transparency and simplifies interpretation of the outputs from spatial cumulative impact assessments, facilitating their application for sustainable resource management and conservation.
Sources of variation in the feeding ecology of the piked spurdog (Squalus megalops): implications for inferring predator–prey interactions from overall dietary composition
Publisher: Oxford University Press (OUP)
Date: 03-04-2021
DOI: 10.1016/J.ICESJMS.2005.04.004
Abstract: Sources of variation in dietary composition were examined in the piked spurdog (Squalus megalops). The species is an opportunistic predator that consumes a wide range of prey items. When importance of prey was measured by weight or occurrence, S. megalops preyed largely on molluscs and teleosts. However, when number of prey was considered, the main items were crustaceans. A bootstrap analysis showed that considerable variability can be expected in the importance of prey items in the species' overall diet. Regional, seasonal, and ontogenetic differences in dietary composition were found, but there were no differences between mature and immature sharks or between males and females. The spatial and temporal variation in diet exhibited by S. megalops and the intrinsic natural variability of the dietary composition of this opportunistic predator suggest that studies that infer predator–prey interactions from overall diet are likely to miss information on the ecological relationships among species and thus account for only part of these interactions.
To what extent do geographic and associated environmental variables correlate with kelp morphology across temperate Australia?
Publisher: CSIRO Publishing
Date: 2005
DOI: 10.1071/MF05042
Abstract: Intraspecific variation in morphology is common among marine algae and may allow plants to exist across a wide geography and range of environmental conditions. Morphological variation of Ecklonia radiata has been described over thousands of kilometres of the temperate Australian coastline however, the degree to which this morphological variability is related to geographic and environmental variation is unknown. We tested the hypotheses that: (1) variation in the morphology of Ecklonia radiata, growing in both monospecific and mixed stands, is related to variation in latitude, longitude, wave exposure, temperature, depth and plant density (collectively referred to as ‘physical variables’) and (2) measures of morphological dissimilarity in E. radiata are greatest among locations that are separated by the largest geographic distances. The combined effect of the physical variables accounted for 74% of the variation in both monospecific and mixed stands. The majority of this variation was related to longitude and the remainder to wave exposure, water temperature and plant density. In monospecific stands, measures of morphological dissimilarity were consistently large between locations that were separated by the greatest geographical distances ( km). The existence of such relationships may not indicate causality, but do contribute to a broad based understanding of major ecological patterns across temperate Australia’s coastline.
Potential effects of climate change on Australian estuaries and fish utilising estuaries: a review
Publisher: CSIRO Publishing
Date: 2011
DOI: 10.1071/MF11047
Abstract: Estuaries are especially vulnerable to the impacts of climate change because changes in climatic and hydrologic variables that influence freshwater and marine systems will also affect estuaries. We review potential impacts of climate change on Australian estuaries and their fish. Geographic differences are likely because southern Australian climates are predicted to become warmer and drier, whereas northern regions may see increased precipitation. Environmental factors, including salinity gradients, suspended sediment, dissolved oxygen and nutrient concentrations, will be influenced by changing freshwater input and other climate variables. Potential impacts will vary depending on the geomorphology of the estuary and the level of build-up of sand bars across estuarine entrances. Changes to estuarine fish assemblages will depend on associated changes to salinity and estuarine-mouth morphology. Marine migrants may be severely affected by closure of estuarine mouths, depending on whether species ‘must’ use estuarine habitat and the level of migratory v. resident in iduals. Depending on how fish in coastal waters locate estuaries, there may be reduced cues associated with estuarine mouths, particularly in southern Australia, potentially influencing abundance. In summary, climate change is expected to have major consequences for Australian estuaries and associated fish, although the nature of impacts will show significant regional variation.
Ocean acidification alters fish populations indirectly through habitat modification
Publisher: Springer Science and Business Media LLC
Date: 10-08-2016
DOI: 10.1038/NCLIMATE2757
Implementing marine ecosystem-based management: Lessons from Australia
Publisher: Oxford University Press (OUP)
Date: 12-07-2017
Abstract: Ecosystem-based management (EBM) is now widely accepted as the best means of managing the complex interactions in marine systems. However, progress towards implementing and operationalizing it has been slow. We take a pragmatic approach to EBM. Our simple definition is balancing human activities and environmental stewardship in a multiple-use context. In this paper, we present case studies on the development and implementation of EBM in Australia. The case studies (Australia’s Ocean Policy, the Great Barrier Reef, New South Wales (NSW) marine estate, Gladstone Harbour, and South Australia and Spencer Gulf) span different spatial scales, from national to regional to local. They also cover different levels of governance or legislated mandate. We identify the key learnings, necessary components and future needs to support better implementation. These include requirements for clearly identified needs and objectives, stakeholder ownership, well defined governance frameworks, and scientific tools to deal with conflicts and trade-offs. Without all these components, multi-sector management will be difficult and there will be a tendency to maintain a focus on single sectors. While the need to manage in idual sectors remains important and is often challenging, this alone will not necessarily ensure sustainable management of marine systems confronted by increasing cumulative impacts.
Dispersal Patterns of Coastal Fish: Implications for Designing Networks of Marine Protected Areas
Publisher: Public Library of Science (PLoS)
Date: 15-02-2012
Fish as proxies of ecological and environmental change
Publisher: Springer Science and Business Media LLC
Date: 30-03-2016
Human effects on ecological connectivity in aquatic ecosystems: Integrating scientific approaches to support management and mitigation
Publisher: Elsevier BV
Date: 11-2015
DOI: 10.1016/J.SCITOTENV.2015.04.034
Abstract: Understanding the drivers and implications of anthropogenic disturbance of ecological connectivity is a key concern for the conservation of bio ersity and ecosystem processes. Here, we review human activities that affect the movements and dispersal of aquatic organisms, including damming of rivers, river regulation, habitat loss and alteration, human-assisted dispersal of organisms and climate change. Using a series of case studies, we show that the insight needed to understand the nature and implications of connectivity, and to underpin conservation and management, is best achieved via data synthesis from multiple analytical approaches. We identify four key knowledge requirements for progressing our understanding of the effects of anthropogenic impacts on ecological connectivity: autecology population structure movement characteristics and environmental tolerance henotypic plasticity. Structuring empirical research around these four broad data requirements, and using this information to parameterise appropriate models and develop management approaches, will allow for mitigation of the effects of anthropogenic disturbance on ecological connectivity in aquatic ecosystems.
Temporal variability in estuarine fish otolith elemental fingerprints: Implications for connectivity assessments
Publisher: Elsevier BV
Date: 10-2012
Parasites as biological tags to assess host population structure: Guidelines, recent genetic advances and comments on a holistic approach
Publisher: Elsevier BV
Date: 08-2014
Alternative life-history patterns of estuarine fish: barium in otoliths elucidates freshwater residency
Publisher: Canadian Science Publishing
Date: 05-2005
DOI: 10.1139/F05-029
Abstract: Elemental concentrations in fish otoliths (earstones) can reconstruct environmental histories of fish if predictable relationships between the environment and elemental incorporation are established. We assessed whether fresh water occupancy of black bream (Acanthopagrus butcheri) can be inferred from otolith barium concentrations (Ba was standardized to calcium (Ca) and expressed as a ratio, Ba:Ca). Otolith Ba:Ca of fish was correlated with ambient Ba:Ca. Using the natural relationships of increasing ambient and otolith Ba:Ca with decreasing salinity, fish from fresh- and salt-water environments were distinguishable. Fish caught in fresh water had approximately double the otolith Ba:Ca of those from salt-water estuaries, for both summer and winter collections. Fish with otolith Ba:Ca ≤5 µmol·mol 1 were classified as resident in salt water, and those with ≥6 µmol·mol 1 as resident in fresh water. Transects of Ba:Ca across fish otoliths classified fish to fresh- or salt-water environments. Fish were identified as having migratory patterns typical of residents, migrants with irregular patterns of diadromy, or migrants with cyclic patterns of anadromomy. Multiple migratory behaviours occurred in fish from the same estuary, indicating far more complex migratory behaviours than were previously known. The application of otolith Ba:Ca to infer freshwater occupancy of fish has rarely been studied, yet may provide more accurate classifications of estuarine environments than strontium (Sr) isotopes and otolith Sr:Ca.
Combined effects of extrinsic and intrinsic factors on otolith chemistry: implications for environmental reconstructions
Publisher: Canadian Science Publishing
Date: 08-2013
Abstract: Otolith chemistry is widely used to understand patterns of fish movement and habitat use, with significant progress made in understanding the influence of environmental factors on otolith elemental uptake. However, few studies consider the interactive effect that environmental and genetic influences have on otolith chemistry. This study assessed the influence of salinity, temperature, and genetics on the incorporation of three key elements (strontium (Sr), barium (Ba), and magnesium (Mg)) into the otoliths of two discrete stocks of mulloway (Argyrosomus japonicus) fingerlings reared in captivity. Elemental analysis via laser ablation inductively coupled – plasma mass spectrometry found that stock (genetics) had a significant interactive effect on otolith Sr:Ca (salinity × temperature × stock) and Ba:Ca (salinity × stock), but did not affect Mg:Ca incorporation. Mg:Ca showed a positive relationship with temperature for both stocks. The incorporation of some elements into the otoliths of fish is the result of complex interactions between extrinsic and intrinsic factors. These findings highlight the necessity to also consider stock along with environmental variables when using trace elemental signatures to reconstruct the environmental histories of fish.
Effect of an artificial reef in Posidonia meadows on fish assemblage and diet of Diplodus annularis
Publisher: Oxford University Press (OUP)
Date: 10-2002
The effect of parasitism by a blood-feeding isopod on the otolith chemistry of host fish
Publisher: CSIRO Publishing
Date: 2013
DOI: 10.1071/MF12123
Abstract: Otolith chemistry is widely used to discriminate fish stocks or populations, although many of the factors that determine trace-element concentrations within the otolith remain poorly understood. We investigated the effect of a blood-feeding isopod ectoparasite, Ceratothoa sp., on the otolith chemistry of yellowtail scad, Trachurus novaezelandiae. We s led 65 fish from three subpopulations of T. novaezelandiae from Jervis Bay in south-eastern Australia, and used laser ablation (LA)–inductivelycoupled plasma mass spectrometry (ICPMS) to measure otolith lithium (Li) : calcium (Ca), magnesium (Mg) : Ca, strontium (Sr) : Ca and barium (Ba) : Ca from four consecutive summer and winter growth bands. Otoliths of parasitised fish were characterised by significantly lower Li : Ca and Mg : Ca, and higher Sr : Ca, than those of unparasitised in iduals from the same subpopulation. The consistency of trends in otolith chemistry across ablation points and among subpopulations suggests that there is a consistent physiological mechanism through which Ceratothoa parasites affect the otolith chemistry of infected in iduals. It is likely that a range of physical, metabolic, chemical and behavioural processes act in concert to influence the otolith chemistry of parasitised fish. Given the ubiquitous distribution of parasites in the marine environment, differential rates of parasitism among fish stocks, populations or migratory contingents may be an important but unappreciated factor driving stock- or population-based differences in otolith chemistry.
Dicyemid fauna composition and infection patterns in relation to cephalopod host biology and ecology
Publisher: Biology Centre, AS CR
Date: 06-08-2014
DOI: 10.14411/FP.2014.034
Elemental uptake via immersion: a mass-marking technique for the early life-history stages of cephalopods
Publisher: Inter-Research Science Center
Date: 31-08-2011
DOI: 10.3354/MEPS09235
Patterns of association between canopy-morphology and understorey assemblages across temperate Australia
Publisher: Elsevier BV
Date: 04-2005
Connectivity within estuaries: An otolith chemistry and muscle stable isotope approach
Publisher: Elsevier BV
Date: 12-2015
Development and evaluation of methods for osmotic induction marking of golden perch Macquaria Ambigua with calcein and Alizarin Red S
Publisher: Wiley
Date: 04-2009
DOI: 10.1577/M07-224.1
Quantitative electron microprobe mapping of otoliths suggests elemental incorporation is affected by organic matrices: implications for the interpretation of otolith chemistry
Publisher: CSIRO Publishing
Date: 2016
DOI: 10.1071/MF15074
Abstract: In an effort to understand the mechanism of otolith elemental incorporation, the distribution of strontium (Sr) and sulfur (S) in otoliths of Platycephalus bassensis was investigated in conjunction with otolith growth patterns. Optimisation of electron probe microanalysis (EPMA) quantitative mapping achieved both high spatial resolution ( µm) and two-dimensional visualisation of the fine scale Sr and S distributions in otoliths of P. bassensis with minimal damage. Electron backscatter diffraction (EBSD) mapping confirmed that grain growth is aligned with the otolith c-axis, with grain orientation independent of both otolith elemental composition and growth patterns. Results showed a linear correlation between Sr and S distribution (R2=0.86), and a clear association with the otolith growth patterns determined by scanning electron microscopy. Further examination by laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) showed that incorporation of Mg and Ba appeared independent of both S distribution and the growth patterns. The results suggest that element incorporation into the otolith is linked to the organic composition in the endolymph during mineralisation, and the organic matrices may assist, in part, the uptake of Sr. Thus, these findings may have significant implications for the interpretation of otolith Sr chemistry.
Determining mark success of 15 combinations of enriched stable isotopes for the batch marking of larval otoliths
Publisher: Wiley
Date: 10-2011
Production of external fluorescent marks on golden perch fingerlings through osmotic induction marking with alizarin red S
Publisher: Wiley
Date: 05-2007
DOI: 10.1577/M06-053.1
Otolith chemistry does not just reflect environmental conditions: A meta‐analytic evaluation
Publisher: Wiley
Date: 05-01-2018
DOI: 10.1111/FAF.12264
Selected Papers from the Sixth World Fisheries Congress
Publisher: Wiley
Date: 10-2013
DOI: 10.1111/JFB.12244
Chemical tags in otoliths indicate the importance of local and distant settlement areas to populations of a temperate sparid, Pagrus auratus
Publisher: Canadian Science Publishing
Date: 03-2005
DOI: 10.1139/F04-221
Abstract: Understanding geographic origins of fish is essential to the management of fisheries and protection of critical juvenile habitats. We used natural chemical tags (Mn, Sr, and Ba), characterized from otoliths of 0+ snapper (Pagrus auratus) (approximately 13 months postsettlement), to determine the origins of 1- and 2-year-old (subadult) fish about to recruit to the Victorian fishery. We s led subadults from eight areas across 700 km of coastline and within the major Victorian fishery, Port Phillip Bay. Maximum likelihood analyses indicated for both cohorts that most subadults in Port Phillip Bay and a significant proportion from west Victorian coastal waters had settled within Port Phillip Bay. The contribution of the Port Phillip Bay settlement area to coastal populations, however, decreased with distance to the west, varied between cohorts, and was negligible at locations over 200 km to the east of the bay. Comparison of elemental tags between 0+ fish of known settlement origin and the subadults indicated that unknown settlement areas may have contributed recruitment to one of the cohorts. These results have highlighted the importance of local settlement areas to sustaining the major Victorian fishery, but small juveniles can migrate large distances from this settlement area and contribute to coastal populations.
Fish otolith chemistry influenced by exposure to multiple environmental variables
Publisher: Elsevier BV
Date: 12-2004
Telomere length and age in pinnipeds: The endangered Australian sea lion as a case study
Publisher: Wiley
Date: 07-02-2011
Temporal and spatial variability in elemental composition of otoliths: implications for determining stock identity and connectivity of populations
Publisher: Canadian Science Publishing
Date: 04-2002
DOI: 10.1139/F02-040
Abstract: Interannual variability in elemental composition of otoliths may confound spatial interpretations. The elemental fingerprints of otoliths of juvenile fish were determined for fish collected from 12 to 15 estuaries in each of three consecutive recruitment years to determine temporal variation in otolith chemistry for each estuary. It was also examined whether there is overlap in elemental fingerprints of fish collected in different years and from different estuaries that may confound subsequent spatial comparisons. Significant differences in otolith chemistry were found among years for in idual elements (lithium, manganese, strontium, and barium) and for multi-element fingerprints. Some estuaries showed large variation in multi-element fingerprints among years, whereas others showed little variation among years. There was some overlap of elemental fingerprints of different estuaries, but these were not always for fish collected in the same year. The significant spatial and temporal variation in elemental fingerprints meant that it was possible to confound spatial differences with temporal differences. Therefore, if the natal estuary of the adults is to be determined, a library of elemental fingerprints needs to be built up over time for each estuary rather than a single year-class of juveniles being used as the elemental fingerprint for a number of year-classes of adults.
Screening of human and veterinary pharmaceuticals in estuarine waters: A baseline assessment for the Tejo estuary
Publisher: Elsevier BV
Date: 10-2018
DOI: 10.1016/J.MARPOLBUL.2018.08.036
Abstract: We investigated the presence of 66 human and veterinary pharmaceuticals from seven therapeutic groups in surface waters of the Tejo estuary. Collection sites covered the entire estuary and included areas near main river inflows and wastewater treatment outfalls, traversing urban, agriculture, aquaculture, and nature reserve areas. Detection of pharmaceuticals was performed via UHPLC-TOF-MS. Pharmaceuticals were found in all sites (32 different compounds in total). Antibiotics, β-blockers, antihypertensives and anti-inflammatories were the most frequently detected (>90%), with variation in concentrations reflecting the multifaceted nature of estuarine surroundings (accumulated site contamination between 15 and 351 ng L
Historical changes in mean trophic level of southern Australian fisheries
Publisher: CSIRO Publishing
Date: 2014
DOI: 10.1071/MF13246
Abstract: Decreases in the mean trophic level (MTL) of fishery catches have been used to infer reductions in the abundance of high trophic level species caused by fishing pressure. Previous assessments of southern Australian fisheries have been inconclusive. The objectives of the present study were to provide more accurate estimates of MTL using disaggregated taxonomic and spatial data. We applied the model of MTL to fisheries catch statistics for the state of South Australia from 1951 to 2010 and a novel set of historical market data from 1936 to 1946. Results show that from 1951 to 2010, MTL declined by 0.16 of a trophic level per decade a rate greater than the global average of 0.10 but equivalent to similar regional investigations in other areas. This change is mainly attributable to large increases in catches of sardine, rather than reductions in the catches of high trophic level species. The pattern is maintained when the historical data is included, providing a time line from 1936 to 2010. Our results show a broadening of the catch of lower trophic levels and suggest care in interpretation of MTL of catches because reductions do not necessarily reflect change in high trophic level species by fishing pressure.
Developing baseline data to understand environmental change: A geochemical study of archaeological otoliths from the Coorong, South Australia
Publisher: Elsevier BV
Date: 08-2011
Development of 15 microsatellite loci from mulloway, Argyrosomus japonicus (Pisces: Sciaenidae) using next generation sequencing and an assessment of their cross amplification in other sciaenids
Publisher: Springer Science and Business Media LLC
Date: 09-11-2014
Ecological performance of construction materials subject to ocean climate change
Publisher: Elsevier BV
Date: 10-2017
DOI: 10.1016/J.MARENVRES.2017.09.011
Abstract: Artificial structures will be increasingly utilized to protect coastal infrastructure from sea-level rise and storms associated with climate change. Although it is well documented that the materials comprising artificial structures influence the composition of organisms that use them as habitat, little is known about how these materials may chemically react with changing seawater conditions, and what effects this will have on associated biota. We investigated the effects of ocean warming, acidification, and type of coastal infrastructure material on algal turfs. Seawater acidification resulted in greater covers of turf, though this effect was counteracted by elevated temperatures. Concrete supported a greater cover of turf than granite or high-density polyethylene (HDPE) under all temperature and pH treatments, with the greatest covers occurring under simulated ocean acidification. Furthermore, photosynthetic efficiency under acidification was greater on concrete substratum compared to all other materials and treatment combinations. These results demonstrate the capacity to maximise ecological benefits whilst still meeting local management objectives when engineering coastal defense structures by selecting materials that are appropriate in an ocean change context. Therefore, mitigation efforts to offset impacts from sea-level rise and storms can also be engineered to alter, or even reduce, the effects of climatic change on biological assemblages.
El Niño – Southern Oscillation drives variations in growth and otolith chemistry in a top predatory fish
Publisher: Elsevier BV
Date: 02-2021
Extrinsic and intrinsic factors shape the ability of using otolith chemistry to characterize estuarine environmental histories
Publisher: Elsevier BV
Date: 09-2018
DOI: 10.1016/J.MARENVRES.2018.06.002
Abstract: Reconstructing habitat use and environmental histories of fish via otolith chemistry relies on linking otolith chemical composition to the surrounding environment, as well as disentangling the consequences of ontogenetic or physiological effects that may mask environmental signals. We used multiple linear and linear mixed models to analyse the importance of environmental (temperature, salinity, water chemistry) and in idual based (fish size) factors on otolith chemical composition and incorporation (Li, Mg, Mn, Sr, and Ba) of juvenile Dicentrarchus labrax, over their time within an estuarine nursery area. Multi model inference highlighted the importance of ontogeny, as well as the influence of temperature and salinity on otolith chemistry and elemental incorporation, with results indicating that intrinsic effects may potentially outweigh environmental effects. Ultimately, understanding if otolith chemistry accurately reflects fine-scale environmental variation is key to reconstruct environmental histories of juvenile fishes in estuaries and will contribute to determining the impact changing estuarine conditions may have on growth and survival.
Connectivity between estuarine and coastal fish populations: contributions of estuaries are not consistent over time
Publisher: Inter-Research Science Center
Date: 02-10-2013
DOI: 10.3354/MEPS10458
Hierarchical approach to the assessment of fishing effects on non-target chondrichthyans: case study of Squalus megalops in southeastern Australia
Publisher: Canadian Science Publishing
Date: 11-2006
DOI: 10.1139/F06-141
Abstract: A three-levelled hierarchical risk assessment approach was trialed using piked spurdog (Squalus megalops) to evaluate the suitability of the approach for chondrichthyan species. At level 1, a qualitative assessment indicated that the only fishing-related activity to have moderate or high impact on S. megalops was "capture fishing" by otter trawl, Danish seine, gillnet, and automatic longline methods. At level 2, a semi-quantitative assessment ranked S. megalops at risk because of its low biological productivity and, possibly, its catch susceptibility from cumulative effects across the separate fishing methods. Finally, at level 3, a quantitative assessment showed that population growth is slow even under the assumption of density-dependent compensation where the fishing mortality rate equals the natural mortality rate. Although published information indicates that relative abundance has been stable in several regions of southern Australia, it is concluded that given its low biological productivity, changed fishing practices leading to increased fishing mortality could quickly put S. megalops at high risk. The hierarchical approach appears particularly useful for assessment of chondrichthyan species in data-limited fisheries. This approach allows for a management response at any level, optimizing research and management efforts by identifying and excluding low-risk species from data intensive assessments.
Embryo development and maternal–embryo nutritional relationships of piked spurdog (Squalus megalops)
Publisher: Springer Science and Business Media LLC
Date: 11-07-2006
Diverse migration tactics of fishes within the large tropical Mekong River system
Publisher: Wiley
Date: 02-06-2022
DOI: 10.1111/FME.12566
Abstract: Fish often migrate to feed, reproduce and seek refuge from predators and prevailing environmental conditions. As a result, migration tactics often vary among species based on a ersity of life history needs, although variation within species is increasingly being recognised as important to population resilience. In this study, within‐ and among‐species ersity in life history migratory tactics of six Mekong fish genera was examined using otolith microchemistry to explore diadromous and potamodromous traits. Two species were catadromous and one species was an estuarine resident, while the remaining three species were facultative in their migration strategies, with up to four tactics within a single species. Migrant and resident contingents co‐existed within the same species. Management, conservation and mitigation strategies that maintain connectivity in large tropical rivers, such as effective fishway design, should consider a ersity of migration tactics at the in idual level for improved outcomes.
First comparative insight into the architecture of COI mitochondrial minicircle molecules of dicyemids reveals marked inter-species variation
Publisher: Cambridge University Press (CUP)
Date: 16-04-2015
DOI: 10.1017/S0031182015000384
Abstract: Dicyemids, poorly known parasites of benthic cephalopods, are one of the few phyla in which mitochondrial (mt) genome architecture departs from the typical ~16 kb circular metazoan genome. In addition to a putative circular genome, a series of mt minicircles that each comprises the mt encoded units (I–III) of the cytochrome c oxidase complex have been reported. Whether the structure of the mt minicircles is a consistent feature among dicyemid species is unknown. Here we analyse the complete cytochrome c oxidase subunit I ( COI ) minicircle molecule, containing the COI gene and an associated non-coding region (NCR), for ten dicyemid species, allowing for first time comparisons between species of minicircle architecture, NCR function and inferences of minicircle replication. Divergence in COI nucleotide sequences between dicyemid species was high (average net ergence = 31·6%) while within species ersity was lower (average net ergence = 0·2%). The NCR and putative 5′ section of the COI gene were highly ergent between dicyemid species (average net nucleotide ergence of putative 5′ COI section = 61·1%). No tRNA genes were found in the NCR, although palindrome sequences with the potential to form stem-loop structures were identified in some species, which may play a role in transcription or other biological processes.
Notes on the population structure of the piked spurdog (Squalus megalops) in southeastern Australia
Publisher: Instituto de Investigaciones Oceanologicas
Date: 16-11-2006
Abstract: Opportunistic s ling suggested a complex population structure for Squalus megalops in southeastern Australia. A total of 929 sharks were analyzed. The sex ratio was biased towards females and there was sexual size dimorphism, with females attaining a larger maximum size than males. In idual analysis of selected fishing shots suggested that S. megalops had a complex population structure, and was segregated by sex, size and breeding condition. Small females and males segregated from large females. In addition, large females in the first year of pregnancy seemed to be separated from those in the second year of pregnancy.
Temperature and diet affect carbon and nitrogen isotopes of fish muscle: can amino acid nitrogen isotopes explain effects?
Publisher: Elsevier BV
Date: 03-2011
Fish otoliths as indicators in ecosystem based management: results of the 5th International Otolith Symposium (IOS2014)
Publisher: CSIRO Publishing
Date: 2016
DOI: 10.1071/MFV67N7_ED
Natural tags reveal populations of Conservation Dependent school shark use different pupping areas
Publisher: Inter-Research Science Center
Date: 12-07-2018
DOI: 10.3354/MEPS12626
Calibrating the element composition of Donax deltoides shells as a palaeo-salinity proxy
Publisher: Elsevier BV
Date: 10-2017
Effects of temperature, salinity and water composition on otolith elemental incorporation of Dicentrarchus labrax
Publisher: Elsevier BV
Date: 08-2013
Determining population structure and connectivity through otolith chemistry of stout whiting, Sillago robusta
Publisher: Wiley
Date: 23-06-2022
DOI: 10.1111/FME.12577
Abstract: Fish otoliths encode information on surrounding environmental conditions. This study used otolith chemistry to investigate population structure and potential connectivity in stout whiting ( Sillago robusta ) along the east coast of Australia. Otoliths were analysed for both minor and trace elements, targeting the otolith core (location of birth) and otolith edge (location of capture), along with Ba:Ca transects to investigate life histories. Significant differences were found between core and edge signatures as well as among s le zones for select trace and minor elements. Otolith edge signatures showed evidence of some heterogeneity among zones, likely influenced by both environmental and physiological factors. This combination of factors is reflected in poor separation of s le zones from the multielement analysis, suggesting that future research may benefit from incorporating additional natural markers. Transects reflected some degree of in iduality in Ba:Ca profiles, with evidence for potential exposure to upwelling events, or movement from shallow, inshore habitats into deeper waters. The variation in Ba:Ca profiles among fish suggests that populations are comprised of both resident and migratory in iduals. While analysis of otolith chemistry could not reliably separate capture locations, patterns in the data suggest that inshore juvenile habitats are likely to be important in supporting exploited populations.
Validating age in southern calamary (Sepioteuthis australis) over seasonal and life history extremes
Publisher: Cambridge University Press (CUP)
Date: 14-07-2010
DOI: 10.1017/S002531541000113X
Abstract: Through rearing known age in iduals and maintaining chemically marked adults in captivity, this study explored the rate of increment formation in southern calamary ( Sepioteuthis australis ) statoliths over seasonal (summer and winter) and ontogenetic (hatchlings and adults) extremes. A ‘one increment–one day’ relationship was verified for captive-reared hatchlings up to 40 days post-hatching which remained stable across the seasonal extremes. This relationship, however, was not evident in the chemically marked adults as inconsistencies of up to 44 days were detected between the number of days elapsed post-stain and the increment count. No seasonal effect was detected in the ratio between increment count and days elapsed, however, the degree of underestimation was consistently greater for winter-caught adults by approximately 2.5 increments relative to summer-caught adults. This less-than-daily increment formation in adults may be due to: (1) the periodicity of increment formation changing throughout the squid's lifespan (2) deleterious effects associated with rearing squid in captivity and/or (3) compromised interpretation of the statolith microstructure as a result of the preparation method.
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Universidade Do Estado De Minas Gerais Unidade Carangola
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