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Posted by Ecological Society of America on March 25, 2016
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Using a meta-analysis, Stephens et al. demonstrate that trophic discrimination factors (TDFs)—offsets between the isotopic composition of diet and animal tissues—are strongly influenced by consumer type and diet source, particularly for carbon (TDF-δ13C). Using field-collected data from a variety of small mammal species (including the pictured deer mouse Peromyscus maniculatus) the authors also show that using incorrect TDFs result in inaccurate estimates of diet. Their study is published in the August issue of Ecological Monographs.

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