Food webs in freshwater floodplain wetlands inundated with environmental flows during drought conditions

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dc.contributor.authorMazumder, Den_AU
dc.contributor.authorJohansen, MPen_AU
dc.contributor.authorSaintilan, Nen_AU
dc.contributor.authorIles, Jen_AU
dc.contributor.authorKnowles, Len_AU
dc.contributor.authorKobayashi, Ten_AU
dc.contributor.authorWen, Len_AU
dc.date.accessioned2010-11-22T23:43:21Zen_AU
dc.date.available2010-11-22T23:43:21Zen_AU
dc.date.issued2010-08-09en_AU
dc.date.statistics2010-08-09en_AU
dc.description.abstractIn the present study we used δS13C and δS15N stable isotope ratios in basal sources, primary producers, and a variety of invertebrate and fish consumers to gain better understanding of the sources of energy and trophic positions for aquatic species at floodplain water bodies within Yanga wetlands, Murrumbidgee floodplain, Australia. We compared δ13C and δ15N data from conditions of higher water levels and volumes that occurred in summer following a managed environmental flow, with data from winter conditions of lower water levels and volumes. Mass-balance mixing models were used to examine relative food source contributions to consumer diet. We also employed probabilistic simulation modelling to better understand trends of trophic positions, diet shifts and varying contributions from sources to consumers in water bodies of the Yanga wetlands. The data indicated contraction in the trophic position of Hypseleotris spp. in winter consistent with shrinking water volumes that induced greater competition, particularly between endemic Hypseleotris spp and and exotic Cyprinus carpio, for overlapping, and more limited varieties of food sources. Data indicated that the δ13C values for fish and insects from the low-water sampling period were typically -2-4%0 depleted compared to the corresponding high-water values. The δ13C values for one basal source (algae) depleted up to 25%0 between the sampling periods, while a second basal source (SOM) depleted less than 4%0. This study provided modelling results that indicated shifts in energy source and trophic position related to water fluctuations were consistent between adjacent water bodies and changes in food availability increased competition among species that may adversely impact population of endemic species.en_AU
dc.identifier.citationMazumder, D., Johansen, M., Saintilan, N., Iles, J., Knowles, L., Kobayashi, T., & Wen. L. (2010). Food webs in freshwater floodplain wetlands inundated with environmental flows during drought conditions. Paper presented to the 7th International Conference on Applications of Stable Isotope Techniques to Ecological Studies (ISOECOL VII), 9th - 13th August 2010, Fairbanks, Alaska: University of Alaska Fairbanks.en_AU
dc.identifier.conferenceenddate13 August 2010en_AU
dc.identifier.conferencename7th International Conference on Applications of Stable Isotope Techniques to Ecological Studies (ISOECOL VII)en_AU
dc.identifier.conferenceplaceFairbanks, Alaskaen_AU
dc.identifier.conferencestartdate9 August 2010en_AU
dc.identifier.govdoc3069en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2874en_AU
dc.language.isoenen_AU
dc.publisherAustralian Nuclear Science and Technology Organisationen_AU
dc.subjectFooden_AU
dc.subjectFloodsen_AU
dc.subjectWetlandsen_AU
dc.subjectDroughtsen_AU
dc.subjectFresh wateren_AU
dc.subjectStable isotopesen_AU
dc.titleFood webs in freshwater floodplain wetlands inundated with environmental flows during drought conditionsen_AU
dc.typeConference Presentationen_AU
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