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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/6920

Title: Inherent variation in carbon and nitrogen isotopic assimilation in the freshwater macro-invertebrate Cherax destructor
Authors: Mazumder, D
Wen, Li
Johansen, MP
Kobayash, T
Saintilan, N
Keywords: Isotopes
Fresh water
Invertebrates
Diet
Absorption
Ecology
Issue Date: 5-Jan-2016
Publisher: Marine and Freshwater Research
Citation: Mazumder, Debashish, Wen, Li, Johansen, Mathew P., Kobayashi, Tsuyoshi, & Saintilan, Neil. (2016). Inherent variation in carbon and nitrogen isotopic assimilation in the freshwater macro-invertebrate Cherax destructor. Marine and Freshwater Research. doi: http://dx.doi.org/10.1071/MF15180
Abstract: Individual 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.
URI: http://dx.doi.org/10.1071/MF15180
http://apo.ansto.gov.au/dspace/handle/10238/6920
ISSN: 1323-1650
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