Inherent variation in carbon and nitrogen isotopic assimilation in the freshwater macro-invertebrate Cherax destructor

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dc.contributor.authorMazumder, Den_AU
dc.contributor.authorWen, Len_AU
dc.contributor.authorJohansen, MPen_AU
dc.contributor.authorKobayashi, Ten_AU
dc.contributor.authorSaintilan, Nen_AU
dc.date.accessioned2016-06-07T01:10:06Zen_AU
dc.date.available2016-06-07T01:10:06Zen_AU
dc.date.issued2016-01-05en_AU
dc.date.statistics2016-06-07en_AU
dc.description.abstractIndividual variability in diet source selection has often been cited as the main factor for intra-specific variation of isotopic signatures among food-web consumers. We conducted a laboratory study to test how well the individual variability of the δ13C and δ15N ratios in the muscle of an omnivore consumer (yabby: Cherax destructor) corresponded to the variability of various diet types and diet combinations. We found that C. destructor muscle isotope signatures varied in concert with the composition of single-source diets, and that this variability was low. However, when fed the same proportional mixture of multiple diet sources, comparatively high isotopic variability was observed among specimens. Results suggest that a substantial component of isotopic variability in wild populations may be owing to inherent differences in uptake, absorption, and sequestration among individuals, which is distinct from behaviourally driven individualised diet selection. Considering the potential of such individual variability in assimilation to be present in many different consumer populations, we suggest further testing for a range of species and inclusion of this source of variation, for interpretation of isotopic data for trophic ecology. © CSIRO 1996-2020en_AU
dc.identifier.citationMazumder, D., Wen, L, Johansen, M.P., Kobayashi, T., & Saintilan, N. (2016). Inherent variation in carbon and nitrogen isotopic assimilation in the freshwater macro-invertebrate Cherax destructor. Marine and Freshwater Research, 67(12), 1928-1937. doi: 10.1071/MF15180en_AU
dc.identifier.govdoc6651en_AU
dc.identifier.issn1323-1650en_AU
dc.identifier.issue12en_AU
dc.identifier.journaltitleMarine and Freshwater Researchen_AU
dc.identifier.pagination1928-1937en_AU
dc.identifier.urihttp://dx.doi.org/10.1071/MF15180en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6920en_AU
dc.identifier.volume67en_AU
dc.language.isoenen_AU
dc.publisherCSIRO Publishingen_AU
dc.subjectIsotopesen_AU
dc.subjectFresh wateren_AU
dc.subjectInvertebratesen_AU
dc.subjectDieten_AU
dc.subjectAbsorptionen_AU
dc.subjectEcologyen_AU
dc.titleInherent variation in carbon and nitrogen isotopic assimilation in the freshwater macro-invertebrate Cherax destructoren_AU
dc.typeJournal Articleen_AU
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