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  Lipid extraction has little effect on the δ¹⁵N of aquatic consumers

Ingram, T., Matthews, B., Harrod, C., Stephens, T., Grey, J., Markel, R., et al. (2007). Lipid extraction has little effect on the δ¹⁵N of aquatic consumers. Limnology and Oceanography: Methods, 5, 338-343.

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 Urheber:
Ingram, Travis, Autor
Matthews, Blake1, Autor           
Harrod, Chris1, 2, Autor           
Stephens, Tom, Autor
Grey, Jonathan1, Autor           
Markel, Russell, Autor
Mazumder, Asit, Autor
Affiliations:
1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              
2Department Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445635              

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 Zusammenfassung: Proper application of stable isotopes (e. g., delta N-15 and delta C-13) to food web analysis requires an understanding of all nondietary factors that contribute to isotopic variability. Lipid extraction is often used during stable isotope analysis (SIA), because synthesized lipids have a low delta C-13 and can mask the delta C-13 of a consumer's diet. Recent studies indicate that lipid extraction intended to adjust delta C-13 may also cause shifts in delta N-15, but the magnitude of and reasons for the shift are highly uncertain. We examined a large data set (n = 854) for effects of lipid extraction (using Bligh and dyer's [ 1959] chloroform-methanol solvent mixtures) on the delta N-15 of aquatic consumers. We found no effect of chemically extracting lipids on the delta N-15 of whole zooplankton, unionid mussels, and fish liver samples, and found a small increase in fish muscle delta N-15 of similar to 0.4%. We also detected a negative relationship between the shift in delta N-15 following extraction and the C:N ratio in muscle tissue, suggesting that effects of extraction were greater for tissue with lower lipid content. As long as appropriate techniques such as those from Bligh and dyer (1959) are used, effects of lipid extraction on delta N-15 of aquatic consumers need not be a major consideration in the SIA of food webs.

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Sprache(n): eng - English
 Datum: 2007
 Publikationsstatus: Erschienen
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 Identifikatoren: eDoc: 334266
Anderer: 2593/S 38754
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Titel: Limnology and Oceanography: Methods
  Alternativer Titel : Limnol. Oceanogr.: Methods
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 5 Artikelnummer: - Start- / Endseite: 338 - 343 Identifikator: ISSN: 1541-5856