Application of isotope mixing models to discriminate dietary sources over small-scale patches in saltmarsh

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dc.contributor.authorAlderson, Ben_AU
dc.contributor.authorMazumder, Den_AU
dc.contributor.authorSaintilan, Nen_AU
dc.contributor.authorZimmerman, Ken_AU
dc.contributor.authorMulry, Pen_AU
dc.date.accessioned2015-09-28T05:02:58Zen_AU
dc.date.available2015-09-28T05:02:58Zen_AU
dc.date.issued2013-07-30en_AU
dc.date.statistics2015-09-11en_AU
dc.description.abstractIntertidal grazing crabs play an important role in estuarine ecosystems, transforming carbon fixed by autotrophs into forms available to a wide range of consumers. Whether the autotrophic carbon is derived primarily from intertidal vegetation or microalgae is an important question to be resolved, as the modification of estuaries alters the balance between these potential food sources, and restoration efforts are best guided by an understanding of the primary drivers of ecosystem energy flow. We utilised the mosaic of C3 and C4 vegetated patches in a temperate saltmarsh to clarify the relative contributions of potential sources of carbon and nitrogen to the diet of 2 species of grapsid crabs: Paragrapsus laevis and Helograpsis haswellianus. The 2 vegetation communities occupied the same position in relation to tidal elevation. We analysed stable isotopes of carbon (δ13C) and nitrogen (δ15N) to discriminate 3 potential sources of dietary carbon using an IsoSource mixing model: microphytobenthos (MPB); fine benthic organic matter (FBOM); and fresh plant material. We found enrichment of δ13C and depletion of δ15N in crabs sampled from patches of the C4 grass Sporobolus virginicus, consistent with the use of C4 derived carbon compared to those sampled in the C3 chenopod Sarcocornia quinqueflora. However, microphytobenthos was similarly depleted within large patches of S. virginicus, implying uptake of dissolved inorganic carbon originating from plant respiration. Multiple-source mixing (IsoSource) models indicated a primary role for MPB and FBOM in crab diets, with locally derived plant material making little contribution to crab diet. The result contrasts with those of studies from subtropical and tropical systems. © 2013, Inter-Research.en_AU
dc.identifier.citationAlderson, B., Mazumder, D., Saintilan, N., Zimmerman, K., & Mulry, P. (2013). Application of isotope mixing models to discriminate dietary sources over small-scale patches in saltmarsh. Marine Ecology Progress Series, 487, 113-122. doi:10.3354/meps10335en_AU
dc.identifier.govdoc6062en_AU
dc.identifier.issn1616-1599en_AU
dc.identifier.journaltitleMarine Ecology Progress Seriesen_AU
dc.identifier.pagination113-122en_AU
dc.identifier.urihttp://dx.doi.org/10.3354/meps10335en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6219en_AU
dc.identifier.volume487en_AU
dc.language.isoenen_AU
dc.publisherMarine Ecology Progress Seriesen_AU
dc.subjectStable isotopesen_AU
dc.subjectCarbonen_AU
dc.subjectNitrogenen_AU
dc.subjectAquatic ecosystemsen_AU
dc.subjectPlantsen_AU
dc.titleApplication of isotope mixing models to discriminate dietary sources over small-scale patches in saltmarshen_AU
dc.typeJournal Articleen_AU
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