Isotopic studies of food-web properties in Yanga wetlands, NSW Australia

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dc.contributor.authorMazumder, Den_AU
dc.contributor.authorJohansen, MPen_AU
dc.contributor.authorKobayashi, Yen_AU
dc.contributor.authorIles, Jen_AU
dc.contributor.authorSaintilan, Nen_AU
dc.contributor.authorKnowles, Len_AU
dc.contributor.authorHollins, SEen_AU
dc.date.accessioned2023-02-08T00:48:34Zen_AU
dc.date.available2023-02-08T00:48:34Zen_AU
dc.date.issued2009-12-03en_AU
dc.date.statistics2022-01-27en_AU
dc.description.abstractFloodplain wetlands provide habitats for a diverse range of species of terrestrial and aquatic biota, and perform important ecosystem functions. Overall productivity and biodiversity of floodplain wetlands is closely linked with water availability and environmental stability. Alternation flow regimes is a major threat to the functioning of food-webs and is responsible for a wide range of ecological responses, including biodiversity loss [1] diversion of energy flow [2] and is suspected to have influenced ecosystem functionality. Changes in land use, flow regulation and diversion for water resources, coupled with climate change have altered energy flow dynamics and structure of aquatic food webs. In the present study stable isotope ratios (δ13C and δ15N) of primary producers, sediment organic matter (SOM) and a variety of invertebrate and fish species are used to gain an understanding of the source of energy and trophic positions for aquatic species at various swamps in the Yanga National Park, lower Murrumbidgee River. A mass balance mixing model [3] was used to determine the fraction of food sources contributing to consumer diet. We also employed probabilistic simulation software (GoldSim) to better understand trends of trophic positions, dietary shifts and varying contributions from sources to consumers in swamps of the Yanga wetlands. We found that energy source varies between swamps in close proximity (in relative contribution of algae). Some trophic links are unaffected by this change (Fig.1) while for others a threshold may be crossed when diet shifts from predominantly benthic organic matter to algae. Over time food chain length is diminished as the floodplain wetland dries, drawing predators into competition. Natural systems are complex and highly variable thereby presenting difficulties and challenges for their effective management. Understanding the variability of the food web properties is important for effective management of the wetlands.en_AU
dc.identifier.booktitle10th Australasian Environmental Isotope Conference and 3rd Australasian Hydrogeology Research Conference abstract volume : Resources and Chemistry Precinct, Curtin University, Perth, Western Australia, 1st-3rd December 2009en_AU
dc.identifier.citationMazumder, D., Johansen, M., Kobayashi, Y., Iles, J., Saintilan, N., Knowles, L., Hollins, S. (2009). Isotopic studies of food-web properties in Yanga wetlands, NSW Australia. Paper presented to the 10th Australasian Environmental Isotope Conference and 3rd Australasian Hydrogeology Research Conference, Resources and Chemistry Precinct, Curtin University, Perth, Western Australia, 1st – 3rd December 2009. In Grice, K. & Trinajstic, K. (eds), The 10th Australasian Environmental Isotope Conference and 3rd Australasian Hydrogeology Research Conference abstract volume : Resources and Chemistry Precinct, Curtin University, Perth, Western Australia, 1st-3rd December 2009, (pp. 9).en_AU
dc.identifier.conferenceenddate3 December 2009en_AU
dc.identifier.conferencename10th Australasian Environmental Isotope Conference and 3rd Australasian Hydrogeology Research Conferenceen_AU
dc.identifier.conferenceplacePerth, Western Australiaen_AU
dc.identifier.conferencestartdate1 December 2009en_AU
dc.identifier.editorsGrice, K. & Trinajstic, K.en_AU
dc.identifier.issn978-0-9807436-0-9en_AU
dc.identifier.pagination9en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14612en_AU
dc.language.isoenen_AU
dc.publisherAustralasian Environmental Isotope Conferenceen_AU
dc.subjectFood chainsen_AU
dc.subjectWetlandsen_AU
dc.subjectNew South Walesen_AU
dc.subjectAustraliaen_AU
dc.subjectHabitaten_AU
dc.subjectSpecies diversityen_AU
dc.subjectWateren_AU
dc.subjectEnvironmenten_AU
dc.subjectEcosystemsen_AU
dc.subjectStable isotopesen_AU
dc.subjectAlgaeen_AU
dc.subjectSimulationen_AU
dc.titleIsotopic studies of food-web properties in Yanga wetlands, NSW Australiaen_AU
dc.typeConference Abstracten_AU
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