Stable isotope (δ13C and δ15N) studies in aquatic ecosystems: response to different conditions

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dc.contributor.authorMazumder, Den_AU
dc.contributor.authorWalsh, Cen_AU
dc.contributor.authorWilliams, RJen_AU
dc.contributor.authorJenkins, Ken_AU
dc.contributor.authorSives, Cen_AU
dc.contributor.authorHollins, SEen_AU
dc.contributor.authorMeredith, KTen_AU
dc.contributor.authorDoyle, Ten_AU
dc.date.accessioned2015-12-28T01:52:32Zen_AU
dc.date.available2015-12-28T01:52:32Zen_AU
dc.date.issued2013-07-10en_AU
dc.date.statistics2015-11-25en_AU
dc.description.abstractRivers and wetlands are complex ecosystems with numerous relationships between water, earth, air, plants and animals. The stable isotopes 13C and 15N were investigated in river and wetland ecosystems to evaluate food web structure complexity, with particular emphasis on their response to changing hydrological conditions. A study developed on the Shoalhaven River focused on assessing the differences in trophic conditions of fish populations found above and below Tallowa Dam. Some species displayed little variation in C or N signatures over the two years sampling period suggesting a preferential dietary niche, regardless of hydrological or density-dependent conditions. The variable diet sources between Australian bass revealed by source mixing calculation also indicated trophic discontinuity within these restricted environments. We found variable trophic levels and sources for the same species of invertebrate and fish between habitats in wetlands show the effect of divergent ecological conditions and landuse practices. For example, in the Macquarie Marshes we found that an extended inter-flood interval caused the decline of riparian vegetation communities including river red gum signalling a shift from aquatic floodplain ecosystems to terrestrial ecosystems where grasses and chenopod shrubs dominate as an organic carbon source. Results provide insights into stable isotope use to better understand potential impacts of future climate variation on river and wetland systems.en_AU
dc.description.sponsorshipAINSE, The Stable Isotope Company, GNS Science, Piccardo, Thermo Fisher Scientific, DKSH, Isoprime and Nu Instruments.en_AU
dc.identifier.citationMazumder, D., Walsh, C., Williams, R., Jenkins, K., Sives, C., Hollins, S., Meredith, K., & Doyle, T. (2013). Stable isotope (δ13C and δ15N) studies in aquatic ecosystems: response to different conditions. Paper presented at the 12th Australian Environmental Isotope Conference, 10th-12th July 2013, University of Western Australia, Perth, Australia.en_AU
dc.identifier.conferenceenddate12 July 2013en_AU
dc.identifier.conferencename12th Australian Environmental Isotope Conferenceen_AU
dc.identifier.conferenceplacePerth, Australiaen_AU
dc.identifier.conferencestartdate10 July 2013en_AU
dc.identifier.govdoc6320en_AU
dc.identifier.urihttp://www.bukibuki.eu/aus-envisotope/AEIC2013_web_files/AEIC12abstracts_book2013.pdfen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6485en_AU
dc.language.isoenen_AU
dc.publisherThe University of Western Australiaen_AU
dc.subjectEcosystemsen_AU
dc.subjectIsotopesen_AU
dc.subjectHydrologyen_AU
dc.subjectInvertebratesen_AU
dc.subjectFishesen_AU
dc.subjectWetlandsen_AU
dc.titleStable isotope (δ13C and δ15N) studies in aquatic ecosystems: response to different conditionsen_AU
dc.typeConference Abstracten_AU
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