Laboratory measures of isotope discrimination factors:comments on Caut, Angulo and Courchamp (2008, 2009)

Perga, Marie-Elodie and Grey, Jonathan (2010) Laboratory measures of isotope discrimination factors:comments on Caut, Angulo and Courchamp (2008, 2009). Journal of Applied Ecology, 47 (4). pp. 942-947. ISSN 0021-8901

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Abstract

1. In a recent paper, Caut, Angulo & Courchamp (2008, Functional Ecology, 22, 255) experimentally measured isotope discrimination factors for rats Rattus rattus. In their study, values for their discrimination factors spanned a much larger range than previously reported in the literature and were found to be negatively related to the stable isotope composition of the diet that the rats were fed. 2. In a subsequent meta-analysis, Caut, Angulo & Courchamp (2009, Journal of Applied Ecology, 46, 443) confirmed the trends they had found in their previous study and pointed to a method for obtaining adequate values for discrimination factors when they could not be measured experimentally. 3.Synthesis and applications. We argue that the discrimination factors determined by Caut et al. (2008) were an artefact of experimental design. We also argue that the reported linear relationships between the stable isotope composition of the diet and isotope discrimination factors in their follow-up meta-analyses (Caut et al. 2009) do not reflect relevant trends that can be extrapolated to the field and that the method they proposed for obtaining adequate values for discrimination factors should be used with considerable care.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Applied Ecology
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2300/2303
Subjects:
ID Code:
74641
Deposited By:
Deposited On:
13 Jul 2015 15:46
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 09:17