ORCID Profile
0000-0003-1704-6198
Current Organisation
James Cook University
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Publisher: MDPI AG
Date: 26-04-2019
DOI: 10.3390/D11050067
Abstract: Patterns of age and growth of a sedentary damsel fish Acanthochromis polyacanthus were tested over a latitudinal range of approximately 10 degrees (1200 km) on the Great Barrier Reef (GBR), Australia. Within latitudes, these patterns were also compared on reefs in distance strata (inner, mid, and outer) across a continental shelf that ranged in width from 52 to 128 km. Although variation in length-max (SLMAX), growth, age-max (AMAX), and the von Bertalanffy metrics of Linf and K were found within and among latitudes, the greatest variation in some demographic characteristics was found among distance strata across the shelf regardless of latitude. Fish were always relatively smaller at inner shelf reefs and grew more slowly when compared to mid and outer shelf reefs this was true regardless of the color morph of fish. The oldest fish collected was 11 years old, and there was no consistent variation in age-max among distances from shore. On outer reefs, there was a negative linear relationship with age-max and latitude. This “tropical gradient” of age only explained 34% of the variation furthermore, this was not found when only the oldest group of fish was considered (top 10%). Fish only reached an age-max of six years on the southernmost reefs. There was a trend for a smaller Linf with latitude but it was not significant and Linf did not vary predictably with water temperature. The s ling of marine protected areas (MPAs) and fished zones did not confound the resultant patterns in that fish were not consistently larger or older in MPAs or fished zones. Instantaneous mortality rates were 0.245–0.685 they were highest at inner reefs and also showed no consistent MPA-related patterns. Our study suggested that the mid and outer shelf waters of the GBR appeared best suited for growth of A. polyacanthus. In conclusion, the position on continental shelves dominated other geographical patterns and needs to be considered in spatial models of growth. We suggest that local environmental conditions such as turbidity and the quality and quantity of plankton likely have a strong influence on distance across the shelf-based demographic patterns of planktivores.
Publisher: Springer Science and Business Media LLC
Date: 15-03-2012
Publisher: Springer Science and Business Media LLC
Date: 18-05-2021
DOI: 10.1007/S00338-021-02096-9
Abstract: Cyclones have one of the greatest effects on the bio ersity of coral reefs and the associated species. But it is unknown how stochastic alterations in habitat structure influence metapopulation structure, connectivity and genetic ersity. From 1993 to 2018, the reefs of the Capricorn Bunker Reef group in the southern part of the Great Barrier Reef were impacted by three tropical cyclones including cyclone Hamish (2009, category 5). This resulted in substantial loss of live habitat-forming coral and coral reef fish communities. Within 6–8 years after cyclones had devastated, live hard corals recovered by 50–60%. We show the relationship between hard coral cover and the abundance of the neon damselfish ( Pomacentrus coelestis ), the first fish colonizing destroyed reefs. We present the first long-term (2008–2015 years corresponding to 16–24 generations of P. coelestis ) population genetic study to understand the impact of cyclones on the meta-population structure, connectivity and genetic ersity of the neon damselfish. After the cyclone, we observed the largest change in the genetic structure at reef populations compared to other years. Simultaneously, allelic richness of genetic microsatellite markers dropped indicating a great loss of genetic ersity, which increased again in subsequent years. Over years, metapopulation dynamics were characterized by high connectivity among fish populations associated with the Capricorn Bunker reefs (2200 km 2 ) however, despite high exchange, genetic patchiness was observed with annual strong genetic ergence between populations among reefs. Some broad similarities in the genetic structure in 2015 could be explained by dispersal from a source reef and the related expansion of local populations. This study has shown that alternating cyclone-driven changes and subsequent recovery phases of coral habitat can greatly influence patterns of reef fish connectivity. The frequency of disturbances determines abundance of fish and genetic ersity within species.
Publisher: Springer Science and Business Media LLC
Date: 16-08-2016
Publisher: Elsevier BV
Date: 12-2016
DOI: 10.1016/J.CUB.2016.10.051
Abstract: Many coral reef fish larvae spend days to months in the open ocean before settlement on coral reefs [1]. Early in development, larvae have limited swimming capabilities and will therefore be greatly affected by currents. This can potentially result in dispersal distances of tens of kilometers [2]. Nevertheless, up to 60 % of surviving larvae have been shown to return to their natal reefs [2]. To home, the larvae must develop strong swimming capabilities and appropriate orientation mechanisms. Most late-stage larval reef fish can, after being passively drifted for days to weeks, swim strongly [3], and Ostorhinchus doederleini larvae have been shown to use chemotaxis to identify their natal reef once in its vicinity [2] and a sun compass for longer distance orientation [4] during the day. But how do they orient at night? Here, we show that newly settled fish caught at One Tree Island (OTI) at the Capricorn Bunker Reef Group (Great Barrier Reef) can use geomagnetic compass information to keep a south-east heading. This behavior might help them return to their natal reef in the absence of any celestial cues at night.
Publisher: Inter-Research Science Center
Date: 2003
DOI: 10.3354/MEPS258213
Publisher: Springer Science and Business Media LLC
Date: 22-01-2001
Publisher: Springer Science and Business Media LLC
Date: 09-02-1998
Publisher: Springer Science and Business Media LLC
Date: 02-03-2005
Publisher: Springer Science and Business Media LLC
Date: 08-03-2012
Publisher: CSIRO Publishing
Date: 2018
DOI: 10.1071/MF18037
Abstract: Marine reserves exhibit increases in targeted fish species, but long-term effects on bio ersity are poorly understood. Factors other than reserve status may affect decadal changes, including environmental change. We examined the fish fauna at the iconic Poor Knights Islands over 4 decades (1974–2016) before and after implementation of a no-take marine reserve in 1998. We document a substantial increase in commercially and recreationally targeted Chrysophrys auratus, which was virtually absent before 1994 but by 2016 had reached up to 11 fish per 500m2 (220 per hectare). There were also large changes to the fish community, including the decline of subtropical and coastal wrasses, some species with no change and others that increased significantly. Many declines occurred years before the arrival of abundant C. auratus, suggesting the changes do not represent a trophic cascade. Furthermore, this normally benthic-feeding fish has adopted a mid-water foraging behaviour targeting planktivorous fish. The increase in C. auratus appears to be linked both to reserve status and catch regulations in the wider region. Overall, the data point to long-term environmental fluctuations from the late 1970s having a negative effect on the abundance of more than half the reef fish species at these islands.
Publisher: JSTOR
Date: 07-05-1999
DOI: 10.2307/1447480
Publisher: Springer Science and Business Media LLC
Date: 14-01-2009
Publisher: Springer Science and Business Media LLC
Date: 12-12-2000
Publisher: Canadian Science Publishing
Date: 06-2004
DOI: 10.1139/F04-036
Abstract: To determine how ocean and lagoonal plume waters from within the same reef were reflected in the chemical composition of otoliths, we conducted an experiment over three consecutive summers where conditions of temperature and food were held constant. Presettlement Pomacentrus coelestis were held in replicate tanks of the two water masses for 9 days. The sagittae were then analyzed at high spatial resolution (5 µm × 50 µm × 4 µm) using laser ablation inductively coupled plasma mass spectrometry. Ba/Ca and Sr/Ca varied between water masses and the rank of these elemental ratios changed among years. Although the reason for this change in rank is not known, likely mechanisms include upwelling and (or) the episodic appearance of phytoplankton blooms inside the lagoon. This is the first demonstration that the elemental signatures of otoliths can vary significantly over small spatial scales in reef systems in the absence of confounding factors, thus complicating studies attempting to discriminate reef-based stocks or elucidate natal origins using otolith chemistry.
Publisher: Elsevier BV
Date: 1996
Publisher: Springer Science and Business Media LLC
Date: 05-06-2008
Publisher: Springer Science and Business Media LLC
Date: 08-08-2016
Publisher: Inter-Research Science Center
Date: 2007
DOI: 10.3354/MEPS341233
Publisher: Inter-Research Science Center
Date: 2004
DOI: 10.3354/MEPS270229
Publisher: Informa UK Limited
Date: 12-1986
Publisher: Wiley
Date: 12-1994
Publisher: Springer Science and Business Media LLC
Date: 21-12-2012
Publisher: Springer Science and Business Media LLC
Date: 29-10-1998
Publisher: Wiley
Date: 02-02-2021
DOI: 10.1002/EDN3.181
Abstract: Stings from certain species of cubozoan jellyfish are dangerous to humans and their seasonal presence in tropical marine waters poses a significant risk to coastal communities. The detection of cubozoans is difficult due to high spatial and temporal variation in their occurrence and abundance. Environmental DNA (eDNA) has the potential to detect rare species and therefore offers potential to detect cubozoans, not only pelagic medusae, but presence of cryptic polyp life stages. The objective of this study was to validate the use of eDNA as a viable detection method for four cubozoan species ( Chironex fleckeri , Copula sivickisi , Carybdea xaymacana, and Carukia barnesi ). Species‐specific primers were developed for each of these four cubozoans and an eDNA approach validated utilizing both laboratory and field trials. Laboratory DNA degradation experiments demonstrated that C . sivickisi DNA degraded quickly but could still be detected in sea water for up to 9 days post‐jellyfish removal. Positive detection was found for C . fleckeri , C. xaymacana, and C. sivickisi medusae in the waters surrounding Magnetic Island, Queensland, in the Austral spring/summer (September‐January). Based on visual surveys, there was a poor relationship between concentration of eDNA and abundance of jellyfish. Positive eDNA lification was also found from water s led near the substratum when C. sivickisi medusae were out of season and absent. This suggests the eDNA analysis was likely detecting C. sivickisi polyps located within the substratum. Consequently, eDNA is an effective tool to detect both the medusae and likely polyps of cubozoans. This approach provides the means to reduce the risk of envenomation to swimmers and enhance our knowledge of cubozoan ecology.
Publisher: Wiley
Date: 06-1992
Publisher: Springer Netherlands
Date: 28-09-2013
Publisher: Inter-Research Science Center
Date: 12-06-2013
DOI: 10.3354/MEPS10300
Publisher: Wiley
Date: 20-11-2008
Publisher: Elsevier BV
Date: 04-2012
Publisher: Inter-Research Science Center
Date: 2000
DOI: 10.3354/MEPS201273
Publisher: Wiley
Date: 09-2013
DOI: 10.1111/JFB.12200
Abstract: This study focussed on the demography and ecology of Scolopsis bilineatus at three locations on the Great Barrier Reef: the Lizard Island Group, Orpheus Island and One Tree Island. Scolopsis bilineatus lived for up to 16 years and had four distinct life-history stages, which varied in their distribution patterns, habitat use and reproductive behaviour. Pre-maturational sex change occurred whereby all males were derived from immature females, and males grew faster and larger than females. Small females and larger males generally formed pairs, which influenced their spatial distributions at small scales. Distributions of S. bilineatus were influenced by depth and exposure within reefs, particularly for juveniles, and most fish were found in shallow, sheltered habitats. Abundance was influenced by benthic cover, and was higher in areas of high coral cover and low where algae were abundant. Habitat associations were stronger at the microhabitat scale, and shelter sites were important for adults. Ontogenetic changes in microhabitat associations were found: juveniles occupied sand and rubble, and adults occupied shelters such as caves and overhangs. Adults showed site fidelity for shelter sites over a period of 4 days and returned to specific shelter sites repeatedly. These findings illustrate the importance of understanding the spatial ecology and habitat use of coral reef fishes, particularly with reference to size-based changes within species.
Publisher: Elsevier BV
Date: 2002
DOI: 10.1016/S0269-7491(01)00109-9
Abstract: Concentrations of 10 organochlorine pesticides and hexachlorobenzene (HCB) were determined in the territorial damselfish Parma microlepis at three urban locations and three reference locations centred on the Sydney region. Dieldrin, HCB and DDE were the most frequently detected organochlorines, occurring in 70-100% of s les collected. Alpha and gamma chlordane were also reasonably common and occurred in more than 30% of the s les. Each organochlorine compound investigated had a distinct spatial pattern of distribution. Related chemicals such as alpha and gamma chlordane, and DDT, DDE and DDD tended to have similar patterns of distribution. There were clear differences in patterns of distribution in organochlorines between urban and reference locations shown using non-parametric multivariate techniques. Relative variability of s les from urban locations was higher than at reference locations in 1993, but there was no consistent pattern of differences in the dispersions of s les among urban and reference locations in 1994. Age and condition indices (K) showed no association with total concentrations of organochlorine residues in fish. Significant, but weak associations were found between organochlorine residues and size, gonad somatic and liver somatic indices.
Publisher: Wiley
Date: 02-2022
DOI: 10.1002/ECS2.3919
Abstract: Marine species and ecosystems are widely affected by anthropogenic stressors, ranging from pollution and fishing to climate change. Comprehensive assessments of how species and ecosystems are impacted by anthropogenic stressors are critical for guiding conservation and management investments. Previous global risk or vulnerability assessments have focused on marine habitats, or on limited taxa or specific regions. However, information about the susceptibility of marine species across a range of taxa to different stressors everywhere is required to predict how marine bio ersity will respond to human pressures. We present a novel framework that uses life‐history traits to assess species' vulnerability to a stressor, which we compare across more than 44,000 species from 12 taxonomic groups (classes). Using expert elicitation and literature review, we assessed every combination of each of 42 traits and 22 anthropogenic stressors to calculate each species' or representative species group's sensitivity and adaptive capacity to stressors, and then used these assessments to derive their overall relative vulnerability. The stressors with the greatest potential impact were related to biomass removal (e.g., fisheries), pollution, and climate change. The taxa with the highest vulnerabilities across the range of stressors were mollusks, corals, and echinoderms, while elasmobranchs had the highest vulnerability to fishing‐related stressors. Traits likely to confer vulnerability to climate change stressors were related to the presence of calcium carbonate structures, and whether a species exists across the interface of marine, terrestrial, and atmospheric realms. Traits likely to confer vulnerability to pollution stressors were related to planktonic state, organism size, and respiration. Such a replicable, broadly applicable method is useful for informing ocean conservation and management decisions at a range of scales, and the framework is amenable to further testing and improvement. Our framework for assessing the vulnerability of marine species is the first critical step toward generating cumulative human impact maps based on comprehensive assessments of species, rather than habitats.
Publisher: Springer Science and Business Media LLC
Date: 07-09-2017
DOI: 10.1038/S41598-017-11452-1
Abstract: Tropical mesophotic and sub-mesophotic fish ecology is poorly understood despite increasing vulnerability of deeper fish assemblages. Worldwide there is greater fishing pressure on continental shelf-breaks and the effects of disturbances on deeper fish species have not yet been assessed. Difficult to access, deeper reefs host undocumented fish ersity and abundance. Baited Remote Underwater Video Stations (BRUVS) with lights were used to s le deeper habitats (54–260 m), in the Great Barrier Reef (GBR), Australia. Here we describe fish bio ersity, relative abundance and richness, assessing the prediction that depth would drive assemblage structure in the GBR. Distinct groups of fishes were found with depth whilst overall richness and abundance decreased steeply between 100 and 260 m. Commercially-valuable Lutjanidae species from Pristipomoides and Etelis genera, were absent from shallower depths. Few fish species overlapped between adjacent depth strata, indicating unique assemblages with depth. We also detected new location records and potential new species records. The high bio ersity of fish found in shelf-break environments is poorly appreciated and depth is a strong predictor of assemblage composition. This may pose a challenge for managers of commercial fisheries as distinct depth ranges of taxa may translate to more readily targeted habitats, and therefore, an inherent vulnerability to exploitation.
Publisher: Inter-Research Science Center
Date: 2000
DOI: 10.3354/MEPS196143
Publisher: CSIRO Publishing
Date: 1994
DOI: 10.1071/MF9941007
Abstract: The utility of otoliths and scales for age and growth studies on Northern and Southern Hemisphere forms of Pagrus auratus ( I00 days old) was investigated. A series of illustrations shows the developmental morphology of wild southern larvae at ages ranging from 0 to 40 days. Reared P. Auratus (of both forms) deposited daily increments in otoliths from or within 1 day of the time of hatching until the age of 40 days. Age-length relationships of wild P auratus (2.4-8.5 mm standard length, SL) from northern New Zealand (1985-86) were not significantly different among times and there was little variation in length at age among fish. In contrast, great variation in age-length relationships was found for reared larvae (5-30 days old). The data suggest that slow-growing fish may suffer high mortality rates in the wild. On the basis of age-length relationships of wild P. auratus, recommendations are made for appropriate s ling frequency in studies of larval abundance. Ctenoid scales formed at 8-9 mm SL in both forms of P. auratus. The number of increments in newly settled P. auratus ( days old) closely approximated the number of days since scale formation (i.e. t 2 5 circuli). This may provide a new method for estimation of the timing of a concurrent change in the behaviour of some fish larvae (e.g. a change in vertical distribution). Importantly, the number of circuli was correlated with the growth of juveniles, just as the spacing of circuli is in other species. Thus, circuli in scales potentially provide a history of in idual growth in small fish after the formation of scales (to 100 days old) and an indication of the time since scales appeared.
Publisher: Inter-Research Science Center
Date: 1991
DOI: 10.3354/MEPS072001
Publisher: Wiley
Date: 06-1991
Publisher: Springer Science and Business Media LLC
Date: 09-03-2010
Publisher: Wiley
Date: 17-06-2005
Publisher: Wiley
Date: 08-06-2004
Publisher: Elsevier BV
Date: 11-1996
Publisher: The Royal Society
Date: 06-09-2014
Abstract: A predictive model of the fate of coral reef fish larvae in a reef system is proposed that combines the oceanographic processes of advection and turbulent diffusion with the biological process of horizontal swimming controlled by olfactory and auditory cues within the timescales of larval development. In the model, auditory cues resulted in swimming towards the reefs when within hearing distance of the reef, whereas olfactory cues resulted in the larvae swimming towards the natal reef in open waters by swimming against the concentration gradients in the smell plume emanating from the natal reef. The model suggested that the self-seeding rate may be quite large, at least 20% for the larvae of rapidly developing reef fish species, which contrasted with a self-seeding rate less than 2% for non-swimming coral larvae. The predicted self-recruitment rate of reefs was sensitive to a number of parameters, such as the time at which the fish larvae reach post-flexion, the pelagic larval duration of the larvae, the horizontal turbulent diffusion coefficient in reefal waters and the horizontal swimming behaviour of the fish larvae in response to auditory and olfactory cues, for which better field data are needed. Thus, the model suggested that high self-seeding rates for reef fish are possible, even in areas where the ‘sticky water’ effect is minimal and in the absence of long-term trapping in oceanic fronts and/or large-scale oceanic eddies or filaments that are often argued to facilitate the return of the larvae after long periods of drifting at sea.
Publisher: Springer Science and Business Media LLC
Date: 1986
DOI: 10.1007/BF00569432
Publisher: Elsevier BV
Date: 08-2003
Publisher: Elsevier BV
Date: 04-2020
Publisher: Wiley
Date: 11-1992
Publisher: Springer Science and Business Media LLC
Date: 09-2004
Publisher: Elsevier BV
Date: 07-1996
Publisher: MDPI AG
Date: 20-02-2019
DOI: 10.3390/D11020026
Abstract: The ecology of habitats along the Great Barrier Reef (GBR) shelf-break has rarely been investigated. Thus, there is little understanding of how associated fishes interact with deeper environments. We examined relationships between deep-reef fish communities and benthic habitat structure. We s led 48 sites over a large depth gradient (54–260 m) in the central GBR using Baited Remote Underwater Video Stations and multibeam sonar. Fish community composition differed both among multiple shelf-break reefs and habitats within reefs. Epibenthic cover decreased with depth. Deep epibenthic cover included sponges, corals, and macro-algae, with macro-algae present to 194 m. Structural complexity decreased with depth, with more calcified reef, boulders, and bedrock in shallower depths. Deeper sites were flatter and more homogeneous with softer substratum. Habitats were variable within depth strata and were reflected in different fish assemblages among sites and among locations. Overall, fish trophic groups changed with depth and included generalist and benthic carnivores, piscivores, and planktivores while herbivores were rare below 50 m. While depth influenced where trophic groups occurred, site orientation and habitat morphology determined the composition of trophic groups within depths. Future conservation strategies will need to consider the vulnerability of taxa with narrow distributions and habitat requirements in unique shelf-break environments.
Publisher: Springer Science and Business Media LLC
Date: 1989
DOI: 10.1007/BF00297173
Publisher: Editorial CSIC
Date: 30-12-1999
Publisher: Proceedings of the National Academy of Sciences
Date: 16-01-2007
Abstract: Many marine fish and invertebrates show a dual life history where settled adults produce dispersing larvae. The planktonic nature of the early larval stages suggests a passive dispersal model where ocean currents would quickly cause panmixis over large spatial scales and prevent isolation of populations, a prerequisite for speciation. However, high bio ersity and species abundance in coral reefs contradict this panmixis hypothesis. Although ocean currents are a major force in larval dispersal, recent studies show far greater retention than predicted by advection models. We investigated the role of animal behavior in retention and homing of coral reef fish larvae resulting in two important discoveries: ( i ) Settling larvae are capable of olfactory discrimination and prefer the odor of their home reef, thereby demonstrating to us that nearby reefs smell different. ( ii ) Whereas one species showed panmixis as predicted from our advection model, another species showed significant genetic population substructure suggestive of strong homing. Thus, the smell of reefs could allow larvae to choose currents that return them to reefs in general and natal reefs in particular. As a consequence, reef populations can develop genetic differences that might lead to reproductive isolation.
Publisher: Frontiers Media SA
Date: 18-06-2019
Publisher: CSIRO Publishing
Date: 31-01-2022
DOI: 10.1071/MF21282
Abstract: Multifactorial s ling designs were used to determine the vertical distribution of ichthyoplankton at multiple temporal and spatial scales in New Zealand. Hypotheses concerning the vertical distribution of fish larvae were tested in the following: depth strata, surface, near-surface, mid-depth and deep, and near the substratum. The consistency of abundance patterns was examined at three sites separated by 2–20 km over 2 months. We also tested for differences in shallow water columns of two depths (20 and 40 m) and both day and night. Although peak abundance of total larval fish was found at upper and lower strata, regardless of total depth of the water column, consistent taxa specific patterns of vertical distribution were also found. Some taxa were most abundant at the surface (e.g. mullids, hemir hids, and kyphosids), whereas others were found at multiple depths below the surface and throughout the water column, regardless of site, time or depth of water column (e.g. carangids, engraulids, clupeids, scombrids, sparids and pleuronectids). Some taxa were most abundant in shallow water columns (e.g. mullids, tripterygiids and gobiids). Rank abundance by depth stratum for non-surface dwelling species varied among sites and times. Diel vertical movements were detected, some taxa (e.g. clupeids, scombrids and bothids) that were most abundant at the surface at night whereas for other taxa this pattern was more variable (e.g. carangids). We conclude that diel depth-related patterns in shallow water columns will influence interactions among taxa and the importance of different transport mechanisms for larval transport.
Publisher: Oxford University Press (OUP)
Date: 06-1994
DOI: 10.1093/ICB/34.3.463
Publisher: Inter-Research Science Center
Date: 19-03-2018
DOI: 10.3354/MEPS12305
Publisher: Informa UK Limited
Date: 09-1988
Publisher: Springer Science and Business Media LLC
Date: 16-10-2000
Publisher: Wiley
Date: 12-02-2009
DOI: 10.1111/J.1755-0998.2008.02509.X
Abstract: Microsatellites are high-resolution genetic markers that may be applied to examine parentage, population structure and the direction and extent of dispersal. Here we present eight polymorphic microsatellite loci developed for the carybdeid jellyfish, Carukia barnesi. The loci were developed from a microsatellite-enriched, partial genomic DNA library and tested for polymorphism on animals from each of two geographically distinct populations, Lizard Island and Double Island, from the Great Barrier Reef. The number of alleles observed for each locus ranged from 7 to 19.
Publisher: Inter-Research Science Center
Date: 27-01-2014
DOI: 10.3354/MEPS10645
Publisher: Informa UK Limited
Date: 02-10-2013
Publisher: Elsevier BV
Date: 03-2010
DOI: 10.1016/J.MARENVRES.2009.08.001
Abstract: Jellyfishes are robust, short-lived animals, tolerant to a wide range of environmental conditions and pollutants. The benthic jellyfish, Cassiopea sp. was collected from five locations along the north and eastern coast of Australia and analysed for trace elements to determine if this species has potential as a marine biomonitor. Both the oral arm and bell tissues readily accumulated aluminium, arsenic, barium, cadmium, chromium, copper, iron, manganese and zinc above ambient seawater levels. In contrast, lithium appeared to be actively regulated within the tissues while calcium, magnesium and strontium reflected the ambient environment. The multi-element signatures showed spatial variation, reflecting the geographical separations between locations, with locations closer together showing more similar elemental patterns. The combination of bioaccumulative capacity, life history traits and biophysical aspects indicate that this species has high potential as a biomonitor in coastal marine systems.
Publisher: Wiley
Date: 04-07-2008
Publisher: Springer Science and Business Media LLC
Date: 28-07-2020
Publisher: Wiley
Date: 31-03-2005
Publisher: Inter-Research Science Center
Date: 2002
DOI: 10.3354/MEPS241151
Publisher: Wiley
Date: 16-05-2022
DOI: 10.1111/JFB.15059
Abstract: Marine resources are often shared among countries, with some fish stocks straddling multiple Exclusive Economic Zones, therefore understanding the structure of populations is important for the effective management of fish stocks. Otolith chemical analyses could discriminate among populations based on differences in the chemical composition of otoliths. We used otoliths from two deepwater snappers (flame snapper Etelis coruscans and ruby snapper Etelis boweni ) to examine the evidence for population structure across six Pacific Island countries using solution‐based inductively coupled plasma mass spectrometry (ICP‐MS) for otolith core and whole otolith s les and laser ablation ICP‐MS (LA‐ICP‐MS) for core and edge areas of a cross‐sectioned otolith. The inter‐species comparison of these methods is important as the two species are often managed under the same regulations. For both species, the two methods demonstrated separation among the locations s led with high classification accuracy. Smaller laser ablation spot size gave greater temporal resolution over the life‐history transect. Comparing the early life‐history section of the otoliths ( i.e. , the core), one interpretation is that young fish experienced more uniform environments in the open ocean as larvae than adults, as the elemental fingerprints had greater overlap among multiple locations. LA‐ICP‐MS methods had some advantages over solution‐based ICP‐MS and generally better discrimination for the trace elements investigated. There were substantial differences between species, but both methods suggested nonmixing populations at the regional scale. Otolith chemistry can be an effective tool in discriminating variation for deepwater marine species in multispecies fisheries, and edge measurements from LA‐ICP‐MS provided the greatest resolution. Although caution should be taken in interpreting the results from relatively small s les sizes, otolith chemical analyses could be useful at these spatial scales to investigate population structure. This information on separate or overlapping populations could be used in future regional fishery management plans.
Publisher: Elsevier BV
Date: 05-2019
Publisher: Informa UK Limited
Date: 29-12-2018
Publisher: CSIRO Publishing
Date: 1996
DOI: 10.1071/MF9960423
Abstract: Settlement and recruitment of the apogonids Apogon doederleini (Jordan & Snyder) and Cheilodipterus quinquelineatus (Cuvier) to continuous reef were examined at One Tree Island, southern Great Barrier Reef. Many settled to patch reefs in sand habitat. Moreover, peaks in settlement (over five to six days) corresponded to peak catches of potential settlers in ichthyoplankton nets at the reef crest. Few newly settled ( mm standard length) apogonids were found on continuous reef where juveniles and adults were abundant. A similar pattern was found on the reef slope outside the lagoon, but total abundance of both species was low in this environment. Results of tagging with tetracycline, diel censuses of patch reefs, and examination of gut contents indicated that fish of all size classes moved from daytime sites and foraged at night. Recruitment to continuous reef appears, particularly in A. doederleini, to take place in two phases: potential settlers enter the lagoon at night and settle into sand rubble habitats fish feed at night and their night-time excursions increase with the size of the fish until they move to continuous reef as Phase 2. The monitoring of continuous reef would not have detected patterns of settlement to One Tree Island.
Publisher: Elsevier BV
Date: 07-2009
DOI: 10.1016/J.CUB.2009.05.046
Abstract: Human activities are releasing gigatonnes of carbon to the Earth's atmosphere annually. Direct consequences of cumulative post-industrial emissions include increasing global temperature, perturbed regional weather patterns, rising sea levels, acidifying oceans, changed nutrient loads and altered ocean circulation. These and other physical consequences are affecting marine biological processes from genes to ecosystems, over scales from rock pools to ocean basins, impacting ecosystem services and threatening human food security. The rates of physical change are unprecedented in some cases. Biological change is likely to be commensurately quick, although the resistance and resilience of organisms and ecosystems is highly variable. Biological changes founded in physiological response manifest as species range-changes, invasions and extinctions, and ecosystem regime shifts. Given the essential roles that oceans play in planetary function and provision of human sustenance, the grand challenge is to intervene before more tipping points are passed and marine ecosystems follow less-buffered terrestrial systems further down a spiral of decline. Although ocean bioengineering may alleviate change, this is not without risk. The principal brake to climate change remains reduced CO(2) emissions that marine scientists and custodians of the marine environment can lobby for and contribute to. This review describes present-day climate change, setting it in context with historical change, considers consequences of climate change for marine biological processes now and in to the future, and discusses contributions that marine systems could play in mitigating the impacts of global climate change.
Publisher: CSIRO Publishing
Date: 1996
DOI: 10.1071/MF9960145
Publisher: Springer Science and Business Media LLC
Date: 19-11-2015
Publisher: CSIRO Publishing
Date: 2004
DOI: 10.1071/MF04071
Abstract: The importance of drifting objects to small juvenile pelagic fish was investigated off the coast of New South Wales, Australia. Distance-related and temporal patterns in the distribution of clumps of drifting algae were investigated with 5000 m2 transects at five distances from shore (0.1, 0.5, 1, 5 and 10 km), two to three times per season for 2 years. Juvenile fish associated with drift algae were collected. Clumps of algae, predominantly Sargassum spp., were most abundant in spring, which coincided with the highest abundance of alga-associated post-flexion juvenile fish. Drift algae were also most abundant close to shore, probably due to the proximity to source and the dominant onshore winds. Fish were quickly attracted to drifting artificial objects (fish aggregation device FADs), although the magnitude of attraction varied greatly among days. The relative abundance of small fish in open waters available to colonise FADs and differing weather conditions may explain much of this variability. More fish colonised FADs with an odour source than unscented control FADs, indicating small fish may use chemical cues to locate drifting structures. We conclude that juvenile fish actively seek drifting objects as pre-settlement habitat, which may reduce predation and enhance settlement opportunities.
Publisher: Wiley
Date: 05-1985
Publisher: Informa UK Limited
Date: 09-2013
Publisher: Public Library of Science (PLoS)
Date: 26-06-2013
Publisher: Inter-Research Science Center
Date: 1992
DOI: 10.3354/MEPS080041
Publisher: CSIRO Publishing
Date: 19-01-2023
DOI: 10.1071/MF22220
Abstract: Rocky reefs of New South Wales (NSW) are characterised by a mosaic of habitats, including kelp forest and urchin-grazed barrens. These habitats support a ersity of dependent species. Decades of research have demonstrated that kelps form extensive forests with distinctive fish and invertebrate faunas and the ‘barrens’ boulder habitat provides shelter and other resources for commercial fishes, charismatic fishes and invertebrates the barrens are not deserts! The feeding activities of herbivorous invertebrates, particularly the black sea urchin (Centrostephanus rodgersii) determine the presence of barrens habitat. Some invertebrates survive only in the presence of urchins and are the food resources for many predatory fishes. The barrens habitat in NSW has been highly stable for decades and is critical for the ersity of reef-based organisms. Because of climate change, Tasmanian waters have warmed and as a result C. rodgersii larvae have dispersed southward from NSW. Importantly, the situation regarding C. rodgersii in Tasmania differs from the established pattern in NSW and this needs to be recognised in the approach to management of this species in the two states. Urchins in NSW should be appreciated as important habitat determiners and the removal of them for whatever purpose would have to be managed carefully.
Publisher: Springer Science and Business Media LLC
Date: 21-01-2019
Publisher: Springer Science and Business Media LLC
Date: 10-1990
DOI: 10.1007/BF01314345
Publisher: Springer Science and Business Media LLC
Date: 23-12-2010
Publisher: Elsevier BV
Date: 09-2003
Publisher: Wiley
Date: 16-03-2017
DOI: 10.1111/JFB.13288
Abstract: Daily increments of Pomacentrus coelestis, an abundant and well-studied fish, were validated for the life of the fish and depending on the location, age-maxima were estimated to be 127-160 days on reefs separated by tens to hundreds of kilometres on the Great Barrier Reef. This contrasts with congeners and other damselfishes that live for 5 years or more. Otoliths of P. coelestis were thinner and had different patterns of banding when compared with relatively long-lived congeners. It is suggested that banding patterns in P. coelestis may be related to patterns of maturation and spawning. The consequences of a short life would have a great influence on the population dynamics of this widespread species. Further, the demographics and habitat preferences of this species suggest rapid colonization and establishment of breeding populations that would quickly change the relative abundance of sympatric fishes.
Publisher: MDPI AG
Date: 19-12-2022
DOI: 10.3390/D14121139
Abstract: Cubozoan jellyfish pose a risk of envenomation to humans and a threat to many businesses, yet crucial gaps exist in determining threats to stakeholders and understanding their ecology. Environmental DNA (eDNA) provides a cost-effective method for detection that is less labour intensive and provides a higher probability of detection. The objective of this study was to develop, optimise and trial the use of eDNA to detect the Australian box jellyfish, Chironex fleckeri. This species was the focus of this study as it is known to have the strongest venom of any cubozoan it is responsible for more than 200 recorded deaths in the Indo-Pacific region. Further, its ecology is poorly known. Herein, a specific and sensitive probe-based assay, multiplexed with an endogenous control assay, was developed, and successfully utilised to detect the deadly jellyfish species and differentiate them from closely related taxa. A rapid eDNA decay rate of greater than 99% within 27 h was found with no detectable influence from temperature. The robustness of the technique indicates that it will be of high utility for detection and to address knowledge gaps in the ecology of C. fleckeri further, it has broad applicability to other types of zooplankton.
Publisher: Springer Science and Business Media LLC
Date: 09-03-2012
Publisher: Informa UK Limited
Date: 12-1985
Publisher: Springer Science and Business Media LLC
Date: 22-09-2008
Publisher: CSIRO Publishing
Date: 2010
DOI: 10.1071/MF08301
Abstract: Although the movements of fishes on coral reefs have been well studied, there are few data on the movement of elasmobranchs on and around cleaning stations. The visitation to cleaning stations by elasmobranchs was documented by direct observation and remote video capture at an oceanic reef in the Coral Sea and the outer Great Barrier Reef at time scales of hours to weeks. Cleaning was only observed at Osprey Reef and duration of occupancy was recorded for all elasmobranch clients. Strong tidal patterns were detected, with 49% of sharks and 59% of mantas engaging in cleaning interactions on ebb tides. Forty-four per cent of non-cleaned sharks were also observed on ebb tides. Some manta rays (n = 19) were in idually identified through ventral skin pigmentation to determine site fidelity three were seen more than once with repeat observations occurring within days. This was consistent among weeks and days within weeks, regardless of time of day. Hypotheses for tidal behaviour are discussed and we argue that these observations are critical in elucidating previously unknown behaviours in elasmobranch ecology. Our study indicates that observations of large elasmobranchs at cleaning stations are another tool to elucidate elasmobranch ecology.
Publisher: Public Library of Science (PLoS)
Date: 24-07-2013
Publisher: Inter-Research Science Center
Date: 06-12-2007
DOI: 10.3354/MEPS07298
Publisher: Elsevier BV
Date: 12-2021
DOI: 10.1016/J.MARPOLBUL.2021.113056
Abstract: Jellyfish are abundant in coastal waters across broad latitudinal ranges and are often considered pests and a group that can cause phase shifts in marine ecosystems. Recent studies have highlighted their potential as biomonitors of contaminants including metals, herbicides and nutrients. Traditionally, sedentary organisms like molluscs and annelid worms have been used, but some jellyfish have similar characteristics of localised distributions and in some cases sedentary behaviour. Broad gradients in contaminant accumulation have been shown for a number of planktonic jellyfish species. An alternative biomonitoring candidate is the tropical/sub-tropical upside-down jellyfish (Cassiopea spp.). In laboratory and field deployments, Cassiopea accumulate measurable contaminants over days to weeks, making them ideal for detecting short-term pulses. Furthermore, the decay curve of contaminants varies temporally post-exposure and contaminant type. This can provide an estimate of the timing of exposure. Cassiopea, along with other jellyfish, have the potential to be an interesting and valuable group of organisms for monitoring coastal impacts.
Publisher: Springer Science and Business Media LLC
Date: 30-04-2021
Publisher: Informa UK Limited
Date: 05-2011
Publisher: Elsevier BV
Date: 06-2020
Publisher: Springer Science and Business Media LLC
Date: 15-04-2016
Publisher: Elsevier BV
Date: 06-2016
DOI: 10.1016/J.MARPOLBUL.2016.03.027
Abstract: Local sources of pollution can vary immensely on small geographic scales and short time frames due to differences in runoff and adjacent land use. This study examined the rate of uptake and retention of trace metals in Cassiopea maremetens, a benthic marine jellyfish, over a short time frame and in the presence of multiple pollutants. This study also validated the ability of C. maremetens to uptake metals in the field. Experimental manipulation demonstrated that metal accumulation in jellyfish tissue began within 24h of exposure to treated water and trended for higher accumulation in the presence of multiple pollutants. C. maremetens was found to uptake trace metals in the field and provide unique signatures among locations. This fine-scale detection and rapid accumulation of metals in jellyfish tissue can have major implications for both biomonitoring and the trophic transfer of pollutants through local ecosystems.
Publisher: Springer Science and Business Media LLC
Date: 30-12-2012
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.
Publisher: Elsevier BV
Date: 06-2023
Publisher: Wiley
Date: 04-2002
Publisher: Wiley
Date: 04-2015
DOI: 10.1890/ES14-00292.1
Publisher: IEEE
Date: 2007
Publisher: Springer Science and Business Media LLC
Date: 09-06-2015
DOI: 10.1007/S10661-015-4657-5
Abstract: Jellyfish have a demonstrated capability to accumulate metals within their tissues, but to date, there have been no quantitative assessments of accumulation and retention rates and patterns. Bioconcentration patterns of copper and zinc in the upside-down jellyfish Cassiopea maremetens were modelled over a 28-day study (14 days exposure followed by 14 days clearance). C. maremetens accumulated copper over 14 days with the maximum calculated copper concentrations at 33.78 μg g(-1) dry weight and bioconcentrated to 99 times water concentrations. Zinc was also accumulated during the exposure period and retained for longer. The maximum theoretical zinc concentration was 125.1 μg g(-1) dry weight with a kinetic bioconcentration factor of 104. The patterns of uptake and retention were different between the elements. The use of kinetic models provided adequate predictions of aqueous metal uptake and retention in C. maremetens. This species has the capacity to very rapidly absorb measurable metals from short-term water-metal exposure.
Publisher: Springer Science and Business Media LLC
Date: 03-03-2020
Publisher: Springer Science and Business Media LLC
Date: 29-05-2010
Publisher: CSIRO Publishing
Date: 2003
DOI: 10.1071/MF02110
Abstract: The timing of recruitment and growth of medusae of the commercially harvested jellyfish, Catostylus mosaicus (Scyphozoa), was examined over a period of 8 years at Botany Bay and 2.5 years at Lake Illawarra in New South Wales, Australia. Recruitment events occurred sporadically during December and between March and July at Botany Bay and between February and July at Lake Illawarra. Recruitment did not occur during late winter or spring at either location, although small numbers of recruit medusae could potentially occur during any time of year. Despite anecdotal observations that recruitment sometimes occurred after periods of heavy rain, we found no correlation between the timing of recruitment and rainfall in Botany Bay over a period of 8 years. Cohort analyses indicated growth of small medusae was very rapid (max. 4.81 mm day–1), with growth rates decreasing as medusae grew larger. Medusae appeared to grow faster at Botany Bay than Lake Illawarra. A conservative estimate indicated medusae of C. mosaicus can live for up to 13 months.
Publisher: Springer Science and Business Media LLC
Date: 24-04-2012
Publisher: Springer Science and Business Media LLC
Date: 12-1992
DOI: 10.1007/BF00301993
Publisher: Elsevier BV
Date: 11-2013
Publisher: Wiley
Date: 25-06-2016
DOI: 10.1002/LOM3.10119
Publisher: Public Library of Science (PLoS)
Date: 18-05-2016
Publisher: Springer Science and Business Media LLC
Date: 20-02-2019
Publisher: Springer Science and Business Media LLC
Date: 02-2005
Publisher: Springer Science and Business Media LLC
Date: 27-08-2020
Publisher: Elsevier BV
Date: 09-2017
DOI: 10.1016/J.CHEMOSPHERE.2017.05.001
Abstract: Herbicides from agricultural run-off have been measured in coastal systems of the Great Barrier Reef over many years. Non-target herbicide exposure, especially photosystem II herbicides has the potential to affect seagrasses and other marine species. The symbiotic benthic jellyfish Cassiopea maremetens is present in tropical/sub-tropical estuarine and marine environments. Jellyfish (n = 8 per treatment) were exposed to four separate concentrations of agricultural formulations of diuron or hexazinone to determine their sensitivity and potential for recovery to pulsed herbicide exposure. Jellyfish growth, symbiont photosynthetic activity and zooxanthellae density were analysed for herbicide-induced changes for 7 days followed by a 7 day recovery period. Both the jellyfish and endosymbiont were more sensitive to diuron than hexazinone. The 7-day EC
Publisher: Springer Science and Business Media LLC
Date: 04-2022
DOI: 10.1007/S10641-022-01246-4
Abstract: Clupeiformes are the most important food fish in the world, and provide a key trophic link in marine food chains. Here we describe broad scale patterns of clupeiform demographic characteristics of the delicate round herring sprat Spratelloides delicatulus on the Great Barrier Reef (GBR). S ling was conducted over 10° of latitude and two seasons at multiple distances across the GBR shelf. The oldest S. delicatulus s led was 152 days and the maximum standard length was 74 mm. Age and length maxima increased with latitude conforming with ‘counter gradient theory’ and these patterns were consistent between years. von Bertalanffy relationships showed that growth rates were highest at Northern GBR sites growth coefficients ranged from 2–6 K year −1 , and were lowest on southern reefs, i.e. ‘tropical gradient of growth’. Daily survivorship ranged from 91–97% day −1 at all sites. Hatching dates estimated from counts of daily otolith increments indicated a prolonged spawning season of at least 9 months. Reproductive development indicated a size-based relationship. Males and females matured at similar sizes ranging from 36–38 mm, but fish from southern sites were 30–40 days older. Tropical clupeiforms live fast and die young, and patterns of abundance, composition and demography followed strong environmental gradients which conformed to some existing models.
Publisher: Springer Science and Business Media LLC
Date: 23-04-2001
Publisher: Springer Science and Business Media LLC
Date: 05-1989
DOI: 10.1007/BF00428124
Publisher: Public Library of Science (PLoS)
Date: 28-08-2013
Publisher: MDPI AG
Date: 19-04-2021
DOI: 10.3390/D13040174
Abstract: Understanding the hierarchy of populations from the scale of metapopulations to mesopopulations and member local populations is fundamental to understanding the population dynamics of any species. Jellyfish by definition are planktonic and it would be assumed that connectivity would be high among local populations, and that populations would minimally vary in both ecological and genetic clade-level differences over broad spatial scales (i.e., hundreds to thousands of km). Although data exists on the connectivity of scyphozoan jellyfish, there are few data on cubozoans. Cubozoans are capable swimmers and have more complex and sophisticated visual abilities than scyphozoans. We predict, therefore, that cubozoans have the potential to have finer spatial scale differences in population structure than their relatives, the scyphozoans. Here we review the data available on the population structures of scyphozoans and what is known about cubozoans. The evidence from realized connectivity and estimates of potential connectivity for scyphozoans indicates the following. Some jellyfish taxa have a large metapopulation and very large stocks ( s of km), while others have clade-level differences on the scale of tens of km. Data on distributions, genetics of medusa and polyps, statolith shape, elemental chemistry of statoliths and biophysical modelling of connectivity suggest that some of the ~50 species of cubozoans have populations of surprisingly small spatial scales and low levels of connectivity. Despite their classification as plankton, therefore, some scyphozoans and cubozoans have stocks of small spatial scales. Causal factors that influence the population structure in many taxa include the distribution of polyps, behavior of medusa, local geomorphology and hydrodynamics. Finally, the resolution of patterns of connectivity and population structures will be greatest when multiple methods are used.
Publisher: Editorial CSIC
Date: 30-12-1999
Publisher: Springer Science and Business Media LLC
Date: 19-10-2013
Publisher: Springer Science and Business Media LLC
Date: 24-04-2022
DOI: 10.1007/S00338-022-02253-8
Abstract: Sponges (Porifera) are a key component of many coral reef ecosystems. In some biogeographic regions, they are considered the dominant benthic fauna and they have the capacity to fulfil many similar roles to reef-building scleractinians. Certainly, sponges predominate at depth, below the critical thresholds of most coral species. The biological and physical attributes of these biogenic communities contribute essential resources for many reef-associated fishes. However, while fish–sponge interactions have been widely documented, there is no global synthesis of the literature on these interrelationships from the perspective of fish ecology. Here we evaluate coral reef fish–sponge relationships, including the role of sponges in providing food and shelter for fishes, the influence fishes have on sponge distribution and abundance and possible outcomes of climate change on fish–sponge interactions. To date, 16 fish families have been shown to associate with 56 different sponge genera, using them as either a source of shelter ( n = 17) or a food source ( n = 50), although methodologies for the latter currently lack consistency. We demonstrate that a more comprehensive understanding of fish–sponge interactions has been garnered from tropical Atlantic coral reefs, which has resulted in a strong biogeographic bias. While it is evident that in some areas of the Caribbean fish are key in shaping the distribution and abundance of sponges, it is not yet known whether this conclusion applies to the Indo-Pacific. With increasing stresses such as bleaching events impacting coral reef ecosystems, further work is needed to evaluate whether sponges can fulfil similar functional roles to those previously provided by reef-building scleractinians. Similarly, determining whether sponge expansion will compensate for the negative effects of reef degradation, or contribute to their decline, is vital.
Publisher: CSIRO Publishing
Date: 2016
DOI: 10.1071/MF16104
Abstract: The structure of medusae populations is poorly known. Natural geochemical signatures based on elemental composition of calcified structures are a common tool for investigating population structure or connectivity in marine systems. Chironex fleckeri (Cubozoa) medusae have a hard calcified structure, the statolith. Laser ablation–inductively coupled plasma mass spectrometry was used to determine the elemental composition of statoliths at varying spatial scales. We investigated medusae population structure using both univariate (element:Ca ratios) and multivariate (multi-element:Ca signature) analyses. Significant differences in some elemental ratios were found among regions (separated by hundreds of kilometres) and among many sites (separated by kilometres) within regions. Canonical discriminant analyses of multi-element:Ca signatures successfully distinguished between both regions and sites within regions with correct classifications of 100% of s les to some locations. Statolith microchemistry can help discriminate populations of jellyfish, but a multiseason comparison demonstrated the need to calibrate spatial differences by season. Our evidence and recent ecological data suggest that populations of C. fleckeri medusae are highly localised at spatial scales of kilometres potential causal factors are discussed.
Publisher: Springer Science and Business Media LLC
Date: 13-05-2021
DOI: 10.1038/S41598-021-89755-7
Abstract: Cubozoan jellyfish are classified as plankton despite the strong swimming and orientation abilities of cubomedusae. How these capabilities could affect cubozoan population structures is poorly understood. Medusae of the cubozoan Copula sivickisi can uniquely attach to surfaces with the sticky pads on their bells. Biophysical modelling was used to investigate the spatial scales of connectivity in a C. sivickisi population. When the medusae were active at night they could maintain their observed distribution on fringing reef if they attached to the reef when the current speed exceeded a moderate threshold. This behaviour facilitated the isolation of a C. sivickisi population on reefs fringing Magnetic Island, Queensland, Australia. Within this distribution, there was considerable within bay retention and medusae rarely travelled 3 km. The few ( 0.1%) medusae lost from the island habitat were largely advected into open water and away from the mainland coast which lies 8 km from the island. Given that successful emigration is unlikely, the island population probably represents a stock that is ecologically distinct from any mainland populations. The cosmopolitan distribution of C. sivickisi could contain incipient or cryptic species given the small scales of connectivity demonstrated here.
Publisher: Inter-Research Science Center
Date: 26-02-2009
DOI: 10.3354/MEPS07794
Publisher: Springer Science and Business Media LLC
Date: 24-02-2005
Publisher: Public Library of Science (PLoS)
Date: 18-03-2016
Publisher: Inter-Research Science Center
Date: 2003
DOI: 10.3354/DAO056135
Abstract: We investigated the effect of time after pulse exposure to 1.0 microg l(-1) endosulfan (applied as Thiodan) on endosulfan residues in the liver and ultrastructural changes in the hepatocytes of the freshwater catfish Tandanus tandanus. Time after exposure did not affect the mean residue level in the liver. After exposure to endosulfan, residues in the liver were 227.47 microg kg(-1) after 1 d and 282.83 microg kg(-1) after 28 d residues in the bile were 313.97 microg kg(-1) after 1 d and 334.53 microg kg(-1) after 28 d. At the end of 28 d exposure, lipofuscin was present in up to 69% of hepatocytes of fish containing residues of endosulfan, but absent from control fish. There was a statistically significant increase in the percentage of pyknotic nuclei and altered rough endoplasmic reticulum 28 d after exposure. The mean percentage of cells with altered endoplasmic reticulum ranged from 12.93% (Day 1) to 7.50% (Day 28) for control fish, while for exposed fish it increased from 14.30% (Day 1) to 35.00% (Day 28). The mean percentage of cells with pyknotic nuclei increased from 1.1 to 2.1% in control fish and from 3.8 to 9.6% in exposed fish. Other ultrastructural changes included increased ultrastructural heterogeneity, progressive vacuolation and fractionation of rough endoplasmic reticulum, accumulation of lysosomes and residual bodies, intranuclear inclusions and pseudoinclusions, membrane whorls and myelinated bodies. Protracted senescence was one of the main features of endosulfan toxicity to T. tandanus hepatocytes.
Publisher: Springer International Publishing
Date: 2023
Publisher: Inter-Research Science Center
Date: 1996
DOI: 10.3354/MEPS141013
Publisher: Inter-Research Science Center
Date: 2003
DOI: 10.3354/MEPS247211
Publisher: Elsevier BV
Date: 05-1994
Publisher: Public Library of Science (PLoS)
Date: 18-10-2013
Publisher: Springer Science and Business Media LLC
Date: 20-01-2016
Publisher: CSIRO Publishing
Date: 1996
DOI: 10.1071/MF9960191
Abstract: A review of the literature suggests that river discharge plumes strongly influence fish larvae and may play a significant role in the recruitment of local fishes. Some rivers drain large land masses to discharge shallow, turbid and nutrient-rich plumes that interact with ocean currents as well as with local oceanography and meteorology these plumes may extend hundreds of kilometres offshore and alongshore. The frontal, or mixing, zone between plume and ocean waters is characterized by strong physical and biological processes. Physical dynamics, e.g. hydrodynamic convergence, and abundant nutrients (both river derived and upwelled) in the vicinity of discharge plumes often generate large stocks of phytoplankton, zooplankton and fish larvae, as well as high rates of primary and secondary production. Physical dynamics not only act to accumulate (and probably retain) biomass in frontal waters, but also transport organisms onshore, offshore and along the frontal boundary. The mechanisms through which river plumes may influence recruitment are not clear. In considering the potential effects of scale of river discharge on recruitment, three alternative hypotheses are discussed. The short-food-chain hypothesis states that recruitment will be enhanced in the vicinity of river plumes because fish larvae experience superior feeding conditions, grow faster and thus experience a shorter stage duration and survive better. The total-larval-production hypothesis is that trophic conditions support such high total production of fish larvae that specific dynamics of growth and mortality are not relevant. The third hypothesis is that plumes facilitate the retention of fish larvae within a limited area, and it is the physical retention rather than production that explains the variation in recruitment. If one or a combination of these hypotheses explains the influence of river plumes on recruitment, then the greatest potential to affect fish recruitment may be possessed by large mid-latitude rivers carrying high suspended-sediment and nutrient loads that discharge into shelf waters to create well defined plumes where primary and secondary production are high.
Publisher: Springer Science and Business Media LLC
Date: 02-1991
DOI: 10.1007/BF01320244
Publisher: Wiley
Date: 29-07-2021
DOI: 10.1111/JFB.14843
Abstract: Inshore marine seascapes support a ersity of interconnected habitats and are an important focus for bio ersity conservation. This study examines the importance of habitat attributes to fish assemblages across a mosaic of inshore habitats: coral reefs, rocky reefs, macroalgae beds and sand/rubble beds. Fishes and benthic habitats were surveyed at 34 sites around continental islands of the central Great Barrier Reef using baited remote underwater video stations (BRUVS). Species richness was influenced foremost by habitat type and also by structural complexity within habitat types. The most speciose assemblages occurred in coral and rocky reef habitats with high structural complexity, provided by the presence of coral bommies/overhangs, boulders and rock crevices. Nonetheless, macroalgae and sand/rubble beds also supported unique species, and therefore contributed to the overall richness of fish assemblages in the seascape. Most trophic groups had positive associations with complexity, which was the most important predictor for abundance of piscivorous fishes and mobile planktivores. There was significant differentiation of fish assemblages among habitats, with the notable exception of coral and rocky reefs. Species assemblages overlapped substantially between coral and rocky reefs, which had 60% common species, despite coral cover being lower on rocky reefs. This suggests that, for many species, rocky and coral substrates can provide equivalent habitat structure, emphasizing the importance of complexity in providing habitat refuges, and highlighting the contribution of rocky reefs to habitat provision within tropical seascapes. The results of this study support an emerging recognition of the collective value of habitat mosaics in inshore marine ecosystems.
Publisher: IEEE
Date: 10-2007
Publisher: Wiley
Date: 12-1990
Start Date: 2014
End Date: 2020
Funder: Australian Research Council
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