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  A revised model for lipid-normalizing δ¹³C values from aquatic organisms, with implications for isotope mixing models

Kiljunen, M., Grey, J., Sinisalo, T., Harrod, C., Immonen, H., & Jones, R. I. (2006). A revised model for lipid-normalizing δ¹³C values from aquatic organisms, with implications for isotope mixing models. Journal of Applied Ecology, 43(6), 1213-1222. doi:10.1111/j.1365-2664.2006.01224.x.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D816-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D817-E
Genre: Journal Article

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kiljunen_2006.pdf (Publisher version), 271KB
 
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 Creators:
Kiljunen, Mikko, Author
Grey, Jonathan1, Author              
Sinisalo, Tuula, Author
Harrod, Chris1, Author              
Immonen, Hemmo, Author
Jones, Roger I., 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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Free keywords: δ¹³C; aquatic invertebrates; C : N ratio; fish; lipids; mixing models; validation
 Abstract: 1. Stable isotope analyses coupled with mixing models are being used increasingly to evaluate ecological management issues and questions. Such applications of stable isotope analyses often require simultaneous carbon and nitrogen analyses from the same sample. Correction of the carbon isotope values to take account of the varying content of C-13-depleted lipids is then frequently achieved by a lipid-normalization procedure using a model describing the relationship between change in δ¹³C following lipid removal and the original C:N ratio of a sample. 2. We evaluated the applicability of two widely used normalization models using empirical data for muscle tissue from a wide range of fish and for aquatic invertebrates. Neither normalization model proved satisfactory, and we present some modifications that greatly improve the fit of one of the models to the fish muscle data. For invertebrates we found no clear relationship between change in δ¹³C following lipid removal and the original C:N ratio. 3. We also examined the effect of lipid-normalization on the output of a mixing model designed to calculate the proportional contribution of prey items to the diet of a consumer. Mixing model output was greatly influenced by whether prey or consumer values alone or together were lipid-normalized and we urge caution in the interpretation of results from these models pending further experimental evidence. 4. Synthesis and applications. We describe a revised lipid-normalization model that should be applicable to a wide range of marine and freshwater fish species in studies applying stable isotope analyses to ecological management issues. However, we strongly advise against applying these kinds of lipid-normalization models to aquatic invertebrate data. The interpretation of outputs from mixing models is greatly influenced by whether the carbon isotope data have been lipid-normalized or not.

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Language(s): eng - English
 Dates: 2006-12
 Publication Status: Published in print
 Pages: -
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 Rev. Method: -
 Identifiers: eDoc: 291410
DOI: 10.1111/j.1365-2664.2006.01224.x
Other: 2508/S 38585
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Title: Journal of Applied Ecology
Source Genre: Journal
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Pages: - Volume / Issue: 43 (6) Sequence Number: - Start / End Page: 1213 - 1222 Identifier: ISSN: 0021-8901