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

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

      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

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        Dr Thea Linke PhD thesis (Murdoch) - PDF download

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      Activity Stream RDF JSON
      western-australian-marine-science-institution
      Key Information
      Published by
      Western Australian Marine Science Institution
      Information classification
      -
      Data theme
      Science
      Data last updated
      21-11-2017
      Update frequency
      -
      Data custodian
      Linke, Thea
      Dataset contact
      Maintainer Not Specified
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      First published
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      Metadata last updated
      25-05-2022
      Data source
      http://catalogue.aodn.org.au/geonetwork/srv/eng/metadata.show?uuid=83c5b3ad-5d15-48bb-9659-628392469f97
      Temporal coverage
      -
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      Acknowledgement

      The Government of Western Australia respectfully acknowledges the traditional owners of country throughout Western Australia and pays its respects to Elders past, present and emerging.

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