ORCID Profile
0000-0002-2749-1060
Current Organisation
Murdoch University
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Publisher: Springer Science and Business Media LLC
Date: 12-11-2014
Publisher: MDPI AG
Date: 13-01-2023
DOI: 10.3390/D15010113
Abstract: Shellfish reefs have been lost from bays and estuaries globally, including in the Swan-Canning Estuary in Western Australia. As part of a national program to restore the ecosystem services that such reefs once provided and return this habitat from near extinction, the mussel Mytilus galloprovincialis was selected for a large-scale shellfish reef construction project in this estuary. To assess the potential filtration capacity of the reef, estuary seston quality, mussel feeding behavior, and valve gape activity were quantified in the laboratory and field during winter and summer. In general, estuary water contained high total particulate concentrations (7.9–8.7 mg L−1). Standard clearance rates were greater in winter (1.9 L h−1 17 °C) than in summer (1.3 L h−1 25 °C), the latter producing extremely low absorption efficiencies (37%). Mussel valves remained open ~97% and ~50% of the time in winter and summer, respectively. They often displayed erratic behavior in summer, possibly due to elevated temperatures and the toxic microalgae Alexandrium spp. Despite numerous stressors, the reef, at capacity, was estimated to filter 35% of the total volume of the estuary over winter, incorporating 42.7 t of organic matter into mussel tissue. The reefs would thus make a substantial contribution to improving estuary water quality.
Publisher: Elsevier BV
Date: 03-2023
Publisher: Informa UK Limited
Date: 16-09-2013
Publisher: Inter-Research Science Center
Date: 07-02-2008
DOI: 10.3354/MEPS07242
Publisher: Elsevier BV
Date: 09-2023
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 05-2017
Publisher: Elsevier BV
Date: 03-2019
Publisher: Wiley
Date: 11-06-2022
DOI: 10.1002/LOM3.10496
Abstract: Accurate and detailed reporting of methods is essential for scientific progress, yet it is widely accepted that authors across all scientific fields tend to provide insufficient methods detail. Given the recent proliferation of automated and semi‐automated technologies for data collection, to address this widespread issue the details needed for interpretation and reproducibility for each specific technique first need to be identified. A systematic literature review assessed the comprehensiveness of method details reported by 116 peer‐reviewed studies published between 2017 and 2020 using the FlowCam (a widely used imaging flow cytometer) to image phytoplankton, finding all to be lacking in critical details, inhibiting reproducibility, and limiting the veracity of some findings. Through this review and three case studies, we identify several key method details that should be reported by FlowCam studies to ensure their findings are credible, comparable, and replicable and illustrate the wide‐reaching implications for not doing so. Future studies using FlowCam for phytoplankton analyses should ensure clear reporting of all relevant details relating to the FlowCam unit, s le preparation, run settings, post‐processing of images, and the considered use of only verified measurement outputs. A methods reporting template is presented as a guideline intended to enhance the quality, interpretability, and repeatability of future FlowCam papers. The pervasiveness of inadequacies in FlowCam methods reporting identified here highlights how vital it is for users of any automated or semi‐automated scientific technologies to have a clear understanding of the impact of all method details on their findings, and to report these details adequately.
Publisher: University of California Press
Date: 10-2016
DOI: 10.1525/ABT.2016.78.8.684
Abstract: Providing detailed feedback in large classes is challenging. We describe how we develop an archive of comments while marking – noting good points, what needs improvement, and how to correct shortcomings. Comments are recorded in a single document with codes. Relevant codes are marked on students' work where issues arise. Each student's annotated assignment is returned with a copy of the comments for the class. Thus, they receive specific feedback on their own work, plus all comments given to the class. Instructors save on marking time because comments are written once on the master list, and only codes and a personalized summary statement are written on the assignment. Markers may collaborate in preparing comments to assist in moderation some generic comments (e.g., presentation and grammar) are portable across different assignments and years and comments from past years may form a rubric for sharing with students before they start an assignment.
Publisher: Elsevier BV
Date: 10-2018
Publisher: Wiley
Date: 10-09-2013
DOI: 10.1111/FAF.12050
Publisher: Springer Science and Business Media LLC
Date: 03-06-2019
Publisher: Elsevier BV
Date: 10-2018
DOI: 10.1016/J.MARPOLBUL.2018.06.062
Abstract: Not all estuaries are equally susceptible to anthropogenic perturbation. Microtidal estuaries with long residence times are intrinsically less robust than well-flushed macrotidal estuaries, facilitating the accumulation of contaminants. This promotes development of blooms of non-toxic and toxic phytoplankton, and hypoxia and anoxia may occur in deeper sections of the typically stratified water column. In Mediterranean and arid climates, high temperatures and low and/or seasonal rainfall can result in marked hypersalinity. Thus, any increase in anthropogenic perturbation will further decrease the health of a system in which the biota already experiences natural stress. Microtidal estuaries are also more susceptible to climate change, the detrimental longer-term effects of which are becoming manifestly obvious. Numerous attempts have been made to develop novel solutions to problems caused by eutrophication, phytoplankton blooms, hypoxia and hypersalinity, which have met with various levels of success, but the need for such measures and effective legislation is increasingly critical.
Publisher: Wiley
Date: 12-09-2015
Publisher: Oxford University Press (OUP)
Date: 05-12-2019
Abstract: Fisher perceptions are a useful source of information that allows changes in stocks to be detected quickly and indicate the social acceptability of different management regulations. Yet traditionally, such information is rarely employed when developing management approaches. Face-to-face interviews were used to elicit recreational and commercial fishers’ perceptions of a crab (Portunus armatus) fishery in three south-western Australian estuaries. Differences in the perceived changes in the average size of crabs and fishing effort, reported concerns and supported solutions were detected among the recreational fishers utilizing the three estuaries and between recreational and commercial fishers in the Peel-Harvey Estuary. However, some common views were expressed by recreational and commercial fishers, with both sectors stating concerns over recreational fisher compliance and increased fishing and environmental pressures. While both sectors believed that reducing fishing and increasing compliance would benefit crab stocks, the mechanisms for achieving this differed. Recreational fishers favoured increasing the length of the seasonal closure, while commercial fishers favoured the introduction of a recreational shore-based fishing licence. These findings suggest that sector- and estuary-specific management rules may better facilitate the amelioration of pressures affecting in idual estuaries and could contribute towards a more socially and biologically sustainable fishery.
Publisher: Elsevier BV
Date: 08-2015
Publisher: Elsevier BV
Date: 03-2014
Publisher: MDPI AG
Date: 14-09-2023
Publisher: MDPI AG
Date: 29-05-2023
Abstract: Effective fisheries management requires an understanding of human dimensions. This study elicited the salient motivations for recreational blue swimmer crab and black bream fishing in Western Australia and whether these views differed depending on the fishing location and/or the characteristics of the fisher. Crab fishers were strongly consumption-orientated and aimed to “catch big crabs” and “catch enough crabs to eat”. Furthermore, 91% consumed their catch, with only 2% practicing catch-and-release fishing. In contrast, 81% of black bream fishers did so for the sport/challenge, with the strongest motivation being to catch a bream considerably above legal size and with food only selected by 15% of respondents most fishers released caught fish. The marked differences between the fisheries for the two species, which co-occur in the same estuaries, are likely driven by the accessible nature of the crab fishery, ease of catching crabs, the low cost of fishing equipment, and their taste. Fishing for black bream, however, requires more expensive equipment, patience, and a greater skill level. Fishers considered crabbing to be as important as other fishing and outdoor activities, whereas bream fishers considered bream fishing considerably more important, reflecting the trophy nature of this fishery.
Publisher: MDPI AG
Date: 05-10-2023
Publisher: Wiley
Date: 12-05-2011
DOI: 10.1111/J.1095-8649.2011.02961.X
Abstract: This study demonstrated that the dietary composition of each of three abundant reef-associated labrid species in temperate Western Australia differed significantly with latitude and changed with increasing body size and almost invariably differed among those species when they co-occurred. These results were derived from comparisons and multivariate analyses of volumetric dietary data, obtained from the foregut contents of Coris auricularis, Notolabrus parilus and Ophthalmolepis lineolatus from the Jurien Bay Marine Park (JBMP) and waters off Perth, 250 km to the south. Latitudinal differences in the dietary compositions of each species in exposed reefs typically reflected greater contributions by large crustaceans, bivalve molluscs, echinoids and annelids to the diets in the waters off Perth than in the JBMP, whereas the reverse was true for gastropods and small crustaceans. The diet of each species exhibited similar, but not identical, quantitative changes with increasing body size, with the contributions of small crustaceans declining and those of large crustaceans and echinoids increasing, while that of gastropods underwent little change. Within the JBMP, the dietary compositions of both C. auricularis and N. parilus were similar in exposed and sheltered reefs and the same was true for N. parilus in the sheltered reefs and interspersed areas of seagrass. The latter similarity demonstrated that, in both of those ergent habitat types, N. parilus feeds on prey associated with either the sand or the macrophytes that cover and lie between the reefs. Although the main dietary components of each species were the same, i.e. gastropods, small crustaceans (mainly hipods and isopods), large crustaceans (particularly penaeids and brachyuran crabs) and echinoids, their contributions varied among those species, which accounts for the significant interspecific differences in diet. Coris auricularis had the most distinct diet, due mainly to an ingestion of greater volumes of small crustaceans, e.g. hipods and isopods, and lesser volumes of large crustaceans, e.g. brachyuran crabs, which was associated with a relatively narrower mouth and smaller teeth and the absence of prominent canines at the rear of the jaw. The above intra and interspecific differences in dietary composition would reduce, on the south-west coast of Australia, the potential for competition for food among and within these three abundant labrids, each of which belongs to different genera within the Julidine clade.
Publisher: Elsevier BV
Date: 11-2019
Publisher: Elsevier BV
Date: 08-2018
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 11-2016
Publisher: Wiley
Date: 30-11-2021
DOI: 10.1111/FWB.13843
Abstract: Gambusia holbrooki is arguably the most widely introduced and ecologically damaging freshwater fish in the world. Although aspects of its aggressive behaviour have been studied in lentic environments and ex situ experiments, the physical damage to native freshwater fishes in riverine systems caused by this behaviour remains relatively unknown. This study quantified the spatial and temporal patterns of abundance of G. holbrooki and the prevalence of fin‐nipping damage on freshwater fishes in river systems of south‐western Australia, a globally endemic hotspot with a high proportion of threatened species. It then determined the environmental factors influencing the abundance of G. holbrooki and the prevalence of fin‐nipping damage on native fishes. Caudal fin damage differed significantly among four endemic native fishes, with damage being most prevalent in the percichthyid Nannoperca vittata , which has a similar size and ecological niche to G. holbrooki . Fin‐nipping damage of native species also showed significant seasonal variation occurring most commonly during summer and autumn when many rivers in this region cease to flow and contract to refuge pools, probably increasing interactions between G. holbrooki and the native fishes. Moreover, the environmental variables that best explained both the density of G. holbrooki and the prevalence of fin‐nipping were broadly similar and were characteristic of more degraded habitats. We anticipate that habitat degradation, river regulation and severe declines in surface flows resulting from climate change will benefit G. holbrooki to the detriment of native fishes. Restoration of riverine environments along with public education c aigns to prevent the further spread of G. holbrooki or the introduction of additional species is crucial to mitigate their effects on aquatic ecosystems.
Publisher: Springer Science and Business Media LLC
Date: 14-06-2019
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 11-2018
Publisher: Wiley
Date: 06-2013
DOI: 10.1111/JFB.12121
Abstract: This account of the riverine ichthyofaunas from the islands of Buton and Kabaena, off south-eastern mainland Sulawesi, represents the first detailed quantitative checklist and ecological study of the riverine fish faunas in the biological hotspot of Wallacea. The results are based on analysis of s les collected by electrofishing at a wide range of sites from July to September in both 2001 and 2002. While the fauna was erse, with the 2179 fishes caught comprising 64 species representing 43 genera and 22 families, the catches were dominated by the Gobiidae (26 species and 25% by numbers), Eleotridae (seven species and 27% by numbers), Zenarchopteridae (three species and 22% by numbers) and Anguillidae (two species and 12% by numbers). The most abundant species were the eleotrids Eleotris aff. fusca-melanosoma and Ophieleotris aff. aporos, the anguillid Anguilla celebesensis, the zenarchopterids Nomorh hus sp. and Nomorh hus ebrardtii and the gobiids Sicyopterus sp. and Glossogobius aff. celebius-kokius. The introduced catfish Clarias batrachus was moderately abundant at a few sites. Cluster analysis, allied with the similarity profiles routine SIMPROF, identified seven discrete groups, which represented s les from sites entirely or predominantly in either Buton (five clusters) or Kabaena (two clusters). Species composition was related to geographical location, distance from river mouth, per cent contribution of sand and silt, altitude and water temperature. The s les from the two islands contained only one species definitively endemic to Sulawesi, i.e. N. ebrardtii and another presumably so, i.e. Nomorh hus sp., contrasting starkly with the 57 species that are endemic to Sulawesi and, most notably, its large central and deep lake systems on the mainland. This accounts for the ichthyofaunas of these two islands, as well as those of rivers in northern mainland Sulawesi and Flores, being more similar to each other than to those of the central mainland lake systems. This implies that the major adaptive radiation of freshwater fishes in Sulawesi occurred in those lacustrine environments rather than in rivers.
Publisher: Elsevier BV
Date: 06-2012
DOI: 10.1016/J.MARPOLBUL.2012.03.006
Abstract: Establishment of a benchmark against which deleterious changes to an estuary can be evaluated requires validating that it has not been subjected to detrimental anthropogenic perturbations and then identifying the biological features which are indicative of a pristine condition and can thus be employed as indicators for detecting and monitoring departures from the natural state. The characteristics of the benthic macroinvertebrate fauna of an essentially pristine, seasonally-open estuary in Western Australia (Broke Inlet) have been determined and compared with those previously recorded for a nearby eutrophic, seasonally-open estuary (Wilson Inlet). Density was far lower in Broke than Wilson. Compositions differed radically at all taxonomic levels, with polychaetes contributing less, and crustaceans more, to the abundance in Broke. Average taxonomic distinctness was greater for Broke than both Wilson and 16 other temperate southern hemisphere estuaries, whereas the reverse was true for variation in taxonomic distinctness, emphasizing that Broke Inlet is pristine.
Publisher: Cold Spring Harbor Laboratory
Date: 21-06-2020
DOI: 10.1101/2020.06.21.163402
Abstract: Microtidal estuaries in Mediterranean climates are particularly vulnerable to the effects of anthropogenic degradation. This study provides the first data on the fish and benthic macroinvertebrate fauna of Hill Inlet, the northernmost estuary in south-western Australia. S ling was conducted in June 2019 (Austral winter), when water levels were very high due to recent heavy rainfall and the bar at the mouth of the estuary was intact. Surface salinities were oligohaline and declined along the longitudinal axis, ranging from 12 to 3. A marked halocline was present at most sites, resulting in pronounced hypoxia. High water levels precluded the use of a seine net at some sites to s le the nearshore fish fauna, however, two species were recorded ( Pseudogobius olorum and Acanthopagrus butcheri ), both of which complete their life-cycle within the estuary. Deeper, offshore waters, s led using gill nets, yielded only four species ( Mugil cephalus, A. butcheri, Adrichetta forsteri and Pomatomus saltatrix ), due to the bar at the mouth of the estuary being closed prior to s ling thus limiting recruitment from marine species. Ten benthic macroinvertebrates species were collected, representing mainly polychaetes, molluscs and crustaceans. The low number of species was likely caused by the hypoxia present throughout most of the bottom waters. Although these data represent a benchmark against which future changes can be detected, it is recommended that additional s ling is conducted when water levels are lower and the bar has been open to provide a more holistic assessment of the fauna of Hill Inlet.
Publisher: Oxford University Press (OUP)
Date: 2017
Publisher: Springer Science and Business Media LLC
Date: 28-01-2017
Publisher: Cambridge University Press (CUP)
Date: 18-09-2014
DOI: 10.1017/S0025315413001227
Abstract: Shade plots, simple visual representations of abundance matrices from multivariate species assemblage studies, are shown to be an effective aid in choosing an overall transformation (or other pre-treatment) of quantitative data for long-term use, striking an appropriate balance between dominant and less abundant taxa in ensuing resemblance-based multivariate analyses. Though the exposition is entirely general and applicable to all community studies, detailed illustrations of the comparative power and interpretative possibilities of shade plots are given in the case of two estuarine assemblage studies in south-western Australia: (a) macrobenthos in the upper Swan Estuary over a two-year period covering a highly significant precipitation event for the Perth area and (b) a wide-scale spatial study of the nearshore fish fauna from five ergent estuaries. The utility of transformations of intermediate severity is again demonstrated and, with greater novelty, the potential importance seen of further mild transformation of all data after differential down-weighting (dispersion weighting) of spatially ‘clumped’ or ‘schooled’ species. Among the new techniques utilized is a two-way form of the RELATE test, which demonstrates linking of assemblage structure (fish) to continuous environmental variables (water quality), having removed a categorical factor (estuary differences). Re-orderings of s le and species axes in the associated shade plots are seen to provide transparent explanations at the species level for such continuous multivariate patterns.
Publisher: Springer Science and Business Media LLC
Date: 09-2017
Publisher: Elsevier BV
Date: 07-2018
Publisher: Wiley
Date: 12-08-2017
DOI: 10.1111/EFF.12288
Publisher: Wiley
Date: 16-05-2018
DOI: 10.1111/FME.12278
No related grants have been discovered for James Tweedley.