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  Determining trophic niche width: an experimental test of the stable isotope approach

Fink, P., Reichwaldt, E. S., Harrod, C., & Rossberg, A. G. (2012). Determining trophic niche width: an experimental test of the stable isotope approach. Oikos, 121(12), 1985-1994. doi:10.1111/j.1600-0706.2012.20185.x.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-1BFE-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-3A73-B
Genre: Journal Article

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Fink et al (2012) Oikos 121 (12) 1985-1994.pdf (Publisher version), 920KB
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Fink et al (2012) Oikos 121 (12) 1985-1994.pdf
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Fink, Patrick1, Author              
Reichwaldt, Elke S.1, Author              
Harrod, Chris1, Author              
Rossberg, Axel G., Author
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1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              

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 Abstract: Determining the trophic niche width of an animal population and the relative degree to which a generalist population consists of dietary specialists are long-standing problems of ecology. It has been proposed that the variance of stable isotope values in consumer tissues could be used to quantify trophic niche width of consumer populations. However, this promising idea has not yet been rigorously tested. By conducting controlled laboratory experiments using model consumer populations (Daphnia sp., Crustacea) with controlled diets, we investigated the effect of individual- and population-level specialisation and generalism on consumer d13C mean and variance values. While our experimental data follow general expectations, we extend current qualitative models to quantitative predictions of the dependence of isotopic variance on dietary correlation time, a measure for the typical time over which a consumer changes its diet. This quantitative approach allows us to pinpoint possible procedural pitfalls and critical sources of measurement uncertainty. Our results show that the stable isotope approach represents a powerful method for estimating trophic niche widths, especially when taking the quantitative concept of dietary correlation time into account.

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Language(s): eng - English
 Dates: 2012-02-032012-04-032012-12
 Publication Status: Published in print
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 Identifiers: DOI: 10.1111/j.1600-0706.2012.20185.x
Other: 2961/S 39306
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Title: Oikos
  Other : Oikos
Source Genre: Journal
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Publ. Info: Copenhagen : Munksgaard International Publishers
Pages: - Volume / Issue: 121 (12) Sequence Number: - Start / End Page: 1985 - 1994 Identifier: ISSN: 1600-0706 (online)
ISSN: 0030-1299 (print)
CoNE: /journals/resource/110978977736795