Data

WAMSI Node 4.3.1b - Trophic interactions in selected south-western Australian estuaries - PhD

Australian Ocean Data Network
Linke, Thea (principalInvestigator, Author) Peters, Janna (Author) Valesini, Fiona, Dr (Author)
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/83c5b3ad-5d15-48bb-9659-628392469f97&rft.title=WAMSI Node 4.3.1b - Trophic interactions in selected south-western Australian estuaries - PhD&rft.identifier=83c5b3ad-5d15-48bb-9659-628392469f97&rft.publisher=Australian Ocean Data Network&rft.description=This study is aimed at identifying the key primary producers, which support abundant fish species with different feeding modes, in a permanently-open (Swan-Canning) and a seasonally-closed (Wilson Inlet) estuary in south-western Australia. The species studied were the sparid Acanthopagrus butcheri (omnivore), the atherinid Leptatherina wallacei (pelagic feeder) and the gobiid Pseudogobius olorum (benthivore). Three complementary, quantitative approaches were used: 1) Stomach content analyses to determine the dietary compositions of the above three species and how they vary with body-size and season; 2) Stable isotope ratios of C13/C12 and N15/N14 for fish and their prey; and 3) Fatty acid biomarkers in fish and dietary items. Stomach content data demonstrated that size-related changes in diet were evident and that dietary compositions of each species differed among estuaries. Stable isotope ratios of N15/N14 showed that the food web in each estuary contained three trophic levels, while the C13/C12 ratio enabled differentiation of the food chains based on detrital material and plankton. Fatty acid data revealed trophic markers for dinoflagellates in A. butcheri and L. wallacei and for diatoms in P. olorum. These findings suggest that: 1) the food resources are partitioned within and among species, 2) the dietary compositions differ between estuaries and 3) different sources of organic material support pelagic and benthic food chainsStatement: Sampling regime: fish were collected seasonally in 2007-2008 at 3 sites in each of the 3 regions (Upper Swan, Canning River, Wilson Inlet), invertebrates and other dietary items were collected in summer and winter only; collection methods of fauna: fish were collected with 21.5m seine net which was laid out parallel to the beach and pulled back onto the beach, benthic macroinvertebrates with 10cm diameter corer, contents of core sieved through 500micron mesh; macroalgae by hand, epibenthic invertebrates with an epibenthic sled which was towed over the substrate surface for at least 100m, insect collected with lighttrap on land at night; fishlarvae, isopods and polychaetes with lighttrap in the water, deployed from the boat; environmental variables: dissolved oxygen content, water temperature, salinity collected with YSI probe and refractometer at each site on each sampling occasion&rft.creator=Linke, Thea&rft.creator=Peters, Janna&rft.creator=Valesini, Fiona, Dr&rft.date=2017&rft.coverage=westlimit=115.75; southlimit=-32.1; eastlimit=116; northlimit=-31.85&rft.coverage=westlimit=115.75; southlimit=-32.1; eastlimit=116; northlimit=-31.85&rft.coverage=westlimit=117.33; southlimit=-35.03; eastlimit=117.48; northlimit=-34.63&rft.coverage=westlimit=117.33; southlimit=-35.03; eastlimit=117.48; northlimit=-34.63&rft_rights=Creative Commons Attribution-Noncommercial-Share Alike 2.5 Australia License http://creativecommons.org/licenses/by-nc-sa/2.5/au/&rft_subject=oceans&rft_subject=biota&rft_subject=environment&rft_subject=ESTUARINE HABITAT&rft_subject=EARTH SCIENCE&rft_subject=BIOSPHERE&rft_subject=AQUATIC ECOSYSTEMS&rft_subject=FOOD-WEB DYNAMICS&rft_subject=ECOLOGICAL DYNAMICS&rft_subject=ECOSYSTEM FUNCTIONS&rft_subject=TROPHIC DYNAMICS&rft_subject=Diet&rft_subject=Stable Isotopes&rft_subject=Fatty Acids&rft.type=dataset&rft.language=English Access the data
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Brief description

This study is aimed at identifying the key primary producers, which support abundant fish species with different feeding modes, in a permanently-open (Swan-Canning) and a seasonally-closed (Wilson Inlet) estuary in south-western Australia. The species studied were the sparid Acanthopagrus butcheri (omnivore), the atherinid Leptatherina wallacei (pelagic feeder) and the gobiid Pseudogobius olorum (benthivore). Three complementary, quantitative approaches were used: 1) Stomach content analyses to determine the dietary compositions of the above three species and how they vary with body-size and season; 2) Stable isotope ratios of C13/C12 and N15/N14 for fish and their prey; and 3) Fatty acid biomarkers in fish and dietary items. Stomach content data demonstrated that size-related changes in diet were evident and that dietary compositions of each species differed among estuaries. Stable isotope ratios of N15/N14 showed that the food web in each estuary contained three trophic levels, while the C13/C12 ratio enabled differentiation of the food chains based on detrital material and plankton. Fatty acid data revealed trophic markers for dinoflagellates in A. butcheri and L. wallacei and for diatoms in P. olorum. These findings suggest that: 1) the food resources are partitioned within and among species, 2) the dietary compositions differ between estuaries and 3) different sources of organic material support pelagic and benthic food chains

Lineage

Statement: Sampling regime: fish were collected seasonally in 2007-2008 at 3 sites in each of the 3 regions (Upper Swan, Canning River, Wilson Inlet), invertebrates and other dietary items were collected in summer and winter only; collection methods of fauna: fish were collected with 21.5m seine net which was laid out parallel to the beach and pulled back onto the beach, benthic macroinvertebrates with 10cm diameter corer, contents of core sieved through 500micron mesh; macroalgae by hand, epibenthic invertebrates with an epibenthic sled which was towed over the substrate surface for at least 100m, insect collected with lighttrap on land at night; fishlarvae, isopods and polychaetes with lighttrap in the water, deployed from the boat; environmental variables: dissolved oxygen content, water temperature, salinity collected with YSI probe and refractometer at each site on each sampling occasion

Notes

Credit
Ian Potter
Credit
Luke Twomey
Credit
Neil Loneragan
Purpose
A sound knowledge of trophic interactions in aquatic ecosystems is crucial for managers and ecologists to understand the functioning of these systems and to provide a baseline for studying the effects of climate change in the future.

Modified: 21 07 2011

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116,-31.85 116,-32.1 115.75,-32.1 115.75,-31.85 116,-31.85

115.875,-31.975

117.48,-34.63 117.48,-35.03 117.33,-35.03 117.33,-34.63 117.48,-34.63

117.405,-34.83

text: westlimit=115.75; southlimit=-32.1; eastlimit=116; northlimit=-31.85

text: westlimit=117.33; southlimit=-35.03; eastlimit=117.48; northlimit=-34.63

Subjects
AQUATIC ECOSYSTEMS | BIOSPHERE | Diet | EARTH SCIENCE | ECOLOGICAL DYNAMICS | ECOSYSTEM FUNCTIONS | Estuarine Habitat | Food-web Dynamics | Fatty Acids | Stable Isotopes | Trophic Dynamics | biota | environment | oceans |

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global : 304657f7-e58b-4067-a6f8-08e417928f0f

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  • global : 83c5b3ad-5d15-48bb-9659-628392469f97
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