ORCID Profile
0000-0003-4415-782X
Current Organisations
University College London
,
University of South Australia
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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.
Marine And Estuarine Ecology (Incl. Marine Ichthyology) | Population And Ecological Genetics | Life Histories (Incl. Population Ecology) | Conservation And Biodiversity | Ecology | Environmental Science and Management |
Socio-cultural issues | Living resources (incl. impacts of fishing on non-target species) | Living resources (flora and fauna) | Aquaculture | Fisheries—commercial | Environmental and resource evaluation not elsewhere classified
Publisher: CSIRO Publishing
Date: 2010
DOI: 10.1071/MF08156
Abstract: Heliocidaris erythrogramma is a widespread Australian sea urchin whose colour varies greatly. Here we report large-scale, hierarchically structured surveys, testing for patterns in colouration of H. erythrogramma associated with wave exposure, and consistency between populations from the Pacific and Southern Oceans. Along the Southern Ocean coastline, more urchins with white dermis were found in (ocean swell-exposed) open coast regions, whereas more urchins with red dermis were usually found in the (ocean swell-protected) bay regions. In contrast, only red dermis urchins were found in both open coast and bay regions along the Pacific coastline. Spine colour was found to be independent of test colour within locations and, while no differences in the frequencies of spine colours were detected between regions of different wave exposure, differences were detected across 1–100s of km within coastlines. Large differences in the frequencies of spine colours were also detected between the two coastlines. Clear differences in two independent characteristics of colour between Southern Ocean and Pacific coastlines, combined with intermediate patterns at a location near the junction of these coastlines, suggest that large-scale morphological patterns might reflect intra-specific genetic differentiation within H. erythrogramma, large-scale environmental differences between temperate Australian coastlines, or an interaction between these two factors.
Publisher: Wiley
Date: 10-03-2002
Publisher: Elsevier BV
Date: 09-2017
DOI: 10.1016/J.CHEMOSPHERE.2017.05.085
Abstract: Hard surfaces submerged in the marine environment often become colonised by macro-organisms unless the surfaces have some form of biofouling protection. While protective paints that contain tributyltin or copper work well to prevent biofouling, release of these materials into the environment has been shown to have wider negative impacts. Consequently, new low-release antifouling paints are being developed with alternative active ingredients, such as avermectins, yet little is known about their potential effects on non-target organisms in marine environments. Here we investigated the toxicity of a key avermectin, specifically abamectin, on several aspects of reproduction (sperm motility, fertilisation success, early larval development) in the Pacific oyster, Crassostrea gigas. Oyster reproduction was generally insensitive to the low concentrations of abamectin, although greater concentrations of abamectin did negatively affect all three endpoints - LOECs were 1000 μg l
Publisher: Springer Science and Business Media LLC
Date: 28-05-2019
DOI: 10.1038/S41598-019-44321-0
Abstract: Species’ responses to climate change will reflect variability in the effects of physiological selection that future conditions impose. Here, we considered the effects of ocean acidification (increases in p CO 2 606, 925, 1250 µatm) and freshening (reductions in salinity 33, 23, 13 PSU) on sperm motility in oysters ( Crassostrea gigas ) from two populations (one recently invaded, one established for 60+ years). Freshening reduced sperm motility in the established population, but this was offset by a positive effect of acidification. Freshening also reduced sperm motility in the recently invaded population, but acidification had no effect. Response direction, strength, and variance differed among in iduals within each population. For the established population, freshening increased variance in sperm motility, and exposure to both acidification and freshening modified the performance rank of males (i.e. rank motility of sperm). In contrast, for the recently invaded population, freshening caused a smaller change in variance, and male performance rank was broadly consistent across treatments. That inter-population differences in response may be related to environmental history (recently invaded, or established), indicates this could influence scope for selection and adaptation. These results highlight the need to consider variation within and among population responses to forecast effects of multiple environmental change drivers.
Publisher: Elsevier BV
Date: 11-2017
Publisher: Elsevier BV
Date: 10-2021
Publisher: Wiley
Date: 18-12-2009
Publisher: Elsevier BV
Date: 12-2008
Publisher: Elsevier BV
Date: 05-2019
DOI: 10.1016/J.ECOENV.2019.01.053
Abstract: Many marine invertebrates reproduce through broadcast spawning, where sperm and eggs are released into the water column and are vulnerable to toxicants present in the environment. The potential impacts of toxicants on spawning success are often assessed through laboratory-based fertilization tests. In most cases, these tests assess toxicant impacts at a single, pre-defined sperm density, based on a sperm:egg ratio that ensures high fertilization success (≥70-80%) in a filtered seawater control. Here we show that use of a single sperm density can considerably underestimate toxicity and that assessments over a range of sperm densities can provide more ecologically relevant, conservative and informative toxicity data. Fertilization assays were run for the polychaete Galeolaria caespitosa exposed to four heavy metals (Cu, Zn, Pb, Cd) across multiple sperm densities. There was a three-fold difference in the toxicity of copper and zinc when calculated at sperm densities of 10
Publisher: Springer Science and Business Media LLC
Date: 21-06-2011
Publisher: University of Chicago Press
Date: 10-2002
DOI: 10.1086/342075
Abstract: For free-spawning organisms that release gametes into the sea, sperm limitation (too few sperm to fertilize all eggs) is a major factor limiting reproductive success. Given such circumstances, the presence of several mechanisms to prevent polyspermy (too many sperm) may seem paradoxical however, a growing body of data suggests that natural fertilization levels, though variable, can routinely be high. Under such conditions, polyspermy is much more likely. The tension between sperm limitation and polyspermy represents sexual conflict because males, in competing to fertilize as many eggs as possible, can impose lethal costs on eggs if multiple sperm gain entry. Here we present data for a marine invertebrate indicating high levels of polyspermy under sperm-limited conditions. When the sea urchin Evechinus chloroticus was induced to spawn in situ, mean rates of polyspermy were [Formula: see text], and polyspermy was recorded at rates as high as 62.7%. Polyspermy was nearly always present, even when fertilization rates were <50%, confirming predictions that it should be present under sperm-limited conditions. Both sperm limitation and polyspermy imposed substantial reproductive costs, and we conclude that both sexual conflict related to polyspermy and sperm limitation have been simultaneous strong selective forces shaping the evolution of reproductive traits in the sea.
Publisher: Elsevier
Date: 2015
Publisher: Informa UK Limited
Date: 06-2003
Publisher: Springer Science and Business Media LLC
Date: 20-04-2008
Publisher: Inter-Research Science Center
Date: 2000
DOI: 10.3354/MEPS195305
Publisher: Elsevier BV
Date: 04-2019
Publisher: CSIRO Publishing
Date: 2003
DOI: 10.1071/MF02019
Abstract: Patterns of spawning activity were assessed by monitoring gonad states over 2.5 years for Chlamys asperrima and Chlamys bifrons at two sites in Gulf St Vincent, South Australia. Chlamys asperrima appeared to have a minor spawning in June, followed by a major spawning starting in late August. In contrast, the gonads of C. bifrons were regressed only during winter and it appeared that C. bifrons spawned for a long period, from late spring (September) until early autumn (March). At one site where s ling was frequent, there was evidence of three series of C. bifrons spawning events during the summer of 1994/95 and at least two series of events during 1995/96. Build-up and decrease in gonad weight was quick, but there was strong evidence of serial spawning for both species. Subsequently, we once observed C. asperrima spawning in situ at Edithburgh Jetty, at a time when gonad weights had been decreasing in previous years, but also long after the time when peak gonad weights had usually occurred. Only patches within the population were seen spawning, with scallops not spawning observed less than 100 m away from those that were. Indirect s ling of gonad condition also suggested that spawning in C. bifrons at Largs Bay was not always synchronous among patches of scallops within a population, nor always between sexes within patches.
Publisher: University of Chicago Press
Date: 08-1998
DOI: 10.1086/286168
Publisher: Springer Science and Business Media LLC
Date: 12-2008
Publisher: Elsevier BV
Date: 10-2014
Publisher: Elsevier BV
Date: 07-2015
Publisher: Inter-Research Science Center
Date: 1997
DOI: 10.3354/MEPS150293
Publisher: Elsevier BV
Date: 11-2017
Publisher: University of Chicago Press
Date: 2003
DOI: 10.1086/340628
Publisher: Oxford University Press (OUP)
Date: 04-2015
Publisher: Informa UK Limited
Date: 09-2010
Publisher: Informa UK Limited
Date: 12-05-2016
Publisher: American Geophysical Union (AGU)
Date: 07-2010
DOI: 10.1029/2009WR008848
Publisher: Springer Science and Business Media LLC
Date: 03-2005
Publisher: Elsevier BV
Date: 09-2018
DOI: 10.1016/J.SCITOTENV.2018.03.358
Abstract: Climate change becomes increasingly more relevant in the context of water systems planning. Tools are necessary to provide the most economic investment option considering the reliability of the infrastructure from technical and environmental perspectives. Accordingly, in this work, an optimisation approach, formulated as a spatially-explicit multi-period Mixed Integer Linear Programming (MILP) model, is proposed for the design of water supply chains at regional and national scales. The optimisation framework encompasses decisions such as installation of new purification plants, capacity expansion, and raw water trading schemes. The objective is to minimise the total cost incurring from capital and operating expenditures. Assessment of available resources for withdrawal is performed based on hydrological balances, governmental rules and sustainable limits. In the light of the increasing importance of reliability of water supply, a second objective, seeking to maximise the reliability of the supply chains, is introduced. The epsilon-constraint method is used as a solution procedure for the multi-objective formulation. Nash bargaining approach is applied to investigate the fair trade-offs between the two objectives and find the Pareto optimality. The models' capability is addressed through a case study based on Australia. The impact of variability in key input parameters is tackled through the implementation of a rigorous global sensitivity analysis (GSA). The findings suggest that variations in water demand can be more disruptive for the water supply chain than scenarios in which rainfalls are reduced. The frameworks can facilitate governmental multi-aspect decision making processes for the adequate and strategic investments of regional water supply infrastructure.
Publisher: Wiley
Date: 06-10-2010
DOI: 10.1002/JCOP.20409
Publisher: Informa UK Limited
Date: 16-03-2010
Publisher: Wiley
Date: 12-2008
DOI: 10.1111/J.1558-5646.2008.00521.X
Abstract: Although there are theoretical reasons to suspect that gametic incompatibility may develop readily among populations of broadcast spawning marine invertebrates, there have been very few studies documenting geographic patterns of interpopulation incompatibility for any species. To address this we determined how successfully in iduals of the intertidal serpulid polychaete, Galeolaria caespitosa, can cross-fertilize within and among populations from across temperate Australia. Fertilization assays revealed asymmetrical differences between very distantly located populations from different coasts, with near-complete incompatibility between eggs from Sydney with sperm from Adelaide, but the reverse cross (Adelaide eggs, Sydney sperm) was reasonably compatible. Although that pattern was congruent with a clear difference in Cytochrome B sequences between worms on the south and east coasts of Australia, we also detected some indication of interpopulation incompatibility within the genetic grouping on east coast, between two populations separated by only 220 km. We then assessed whether commonly proposed gametic compatibility arms-races could account for these patterns. Our results suggest reduced gametic compatibility may reduce a female's maximum fertilization potential, resulting in a cost to this potential mechanism for reducing polyspermy. Consequently, the apparently rapid development of reproductive barriers here seems unlikely to have been driven by arms-races involving sexual conflict over fertilization rate.
Publisher: Elsevier
Date: 2016
Publisher: Elsevier BV
Date: 11-2012
DOI: 10.1016/J.MARPOLBUL.2012.08.008
Abstract: In north Western Australia coral reefs occur near ports being developed to support rapidly expanding resources industries. Dredging for port construction is required to stop during significant mass coral spawning events due to the sensitivity of gametes and larvae to increases in turbidity and sedimentation, but the timing of this event can vary between seasons and years so monitoring is used to predict when spawning is imminent. Here we used simulations to mimick s ling strategies currently used in some coral spawning monitoring programmes in Western Australia, to assess the ability of these programmes to be able to predict multi-specific mass spawning events. We found that current practices may sometimes miss spawning events that are likely to be considered large enough to warrant stopping dredging. Generally, s ling fewer in iduals in a large number of species is a better way of monitoring for upcoming spawning than s ling a large number of in iduals in a small number of species, but overall, greater s ling efforts than are currently undertaken are needed if moderately sized events are to be detected reliably. Determining exactly how many s les are needed, however, depends on having a clearer definition of what actually constitutes a "significant mass spawning" event in the first place.
Publisher: Springer Science and Business Media LLC
Date: 27-11-1997
Publisher: Elsevier BV
Date: 04-2004
Publisher: Regional Euro-Asian Biological Invasions Centre Oy (REABIC)
Date: 2017
Publisher: Informa UK Limited
Date: 12-2009
Publisher: Elsevier BV
Date: 03-2016
DOI: 10.1016/J.MARENVRES.2015.12.005
Abstract: Forecasting the impacts of changes in water quality on broadcast spawning aquatic organisms is a key aspect of environmental monitoring. Rapid assays of reproductive potential are central to this monitoring, and there is a need to develop a variety of methods to identify responses. Here, we report a proof-of-concept study that assesses whether quantification of "Sperm Accumulated Against Surface" (SAAS) of tissue culture well-plates could be a rapid and simple proxy measure of fertilisation success. Our results confirm that motile sperm (but not immotile sperm) actively accumulate at surfaces and that the pattern of accumulation reflects fertilisation success in the model oyster species Crassostrea gigas. Furthermore, we confirm these patterns of SAAS for another marine species, the polychaete Galeolaria caespitosa, as well as for a freshwater species, the fish Gasterosteus aculeatus. For all species considered, SAAS reflected changes in sperm performance caused by experimentally manipulated differences in water quality (here, salinity). These findings indicate that SAAS could be applied easily to a range of species when examining the effects of water quality. Measurement of SAAS could, therefore, form the basis of a rapid and reliable assay for bioassessments of broadcast spawning aquatic organisms.
Publisher: CSIRO Publishing
Date: 2018
DOI: 10.1071/AJ17152
Abstract: Social media is becoming ubiquitous, but may not always be an effective way for companies to interact with their stakeholders. This paper reports the results of ongoing assessments of social media use in the Australian energy and resource sectors, starting from 2013. Nearly all energy and mining companies had publicly accessible websites but, although increasing, social media use is (still) relatively limited compared with other industries. LinkedIn (with a recruitment focus) was the social media channel most commonly adopted across the extractive sectors, although Twitter and YouTube are increasingly being adopted. Larger companies use more channels, post more and have more followers. In contrast, even small environmental and community groups frequently used a range of social media. Although this may suggest social media should be a place to engage such groups in dialogue, other recent studies suggest that, in practice, social media platforms are often difficult venues to do this, not least because companies cannot control the directions of conversations. For ex le, customers of utility companies frequently use social media to bypass official grievance mechanisms, which, over time, has apparently led to demand-driven increases in resourcing needed to deal with this. In addition to providing an industry-wide benchmark of social media use, these surveys provide a basis for comparison with other industries to understand what role social media could have in better engaging stakeholders associated with the extractive sectors.
Publisher: Elsevier BV
Date: 07-2017
Publisher: Elsevier BV
Date: 2022
DOI: 10.1016/J.SCITOTENV.2022.159503
Abstract: From 1889, aerial emissions and effluent from a coastal lead‑zinc smelter at Port Pirie, South Australia, have led to the accumulation of lead (Pb), zinc (Zn), arsenic (As), cadmium (Cd) and copper (Cu) in the surrounding marine environment. Despite this, extensive stands of grey mangrove (Avicennia marina) inhabit coastal areas at Port Pirie, right up to the smelter's boundary. To understand the contamination level the mangroves are living in there, elemental concentrations were measured in mangrove sediments, leaves, pneumatophores and fruits at sites 0.30-43.0 km from the smelter. Plant health was assessed via leaf chlorophyll content at four sites with contrasting contamination, as well as in situ labile elemental concentration using diffusive gradients in thin films (DGT). Sites 0.05). These results reveal that A. marina tolerate high elemental contamination at Port Pirie, contributing to lesser but still high contamination in plants, warranting further investigation into non-lethal impacts on mangroves or additional biota inhabiting this ecosystem.
Publisher: Elsevier BV
Date: 10-2023
Publisher: Springer Science and Business Media LLC
Date: 1996
DOI: 10.1007/BF00571374
Publisher: Springer Science and Business Media LLC
Date: 12-12-0015
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 03-2004
End Date: 06-2008
Amount: $70,668.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2003
End Date: 12-2004
Amount: $60,000.00
Funder: Australian Research Council
View Funded Activity