Stable isotope composition of fatty acids in organisms of different trophic levels in the Yenisei River

We studied four-link food chain, periphytic microalgae and water moss (producers), trichopteran larvae (consumers I), gammarids (omnivorous--consumers II) and Siberian grayling (consumers III) at a littoral site of the Yenisei River on the basis of three years monthly sampling. Analysis of bulk carb...

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Bibliographic Details
Published in:PloS one 2012-03, Vol.7 (3), p.e34059-e34059
Main Authors: Gladyshev, Michail I, Sushchik, Nadezhda N, Kalachova, Galina S, Makhutova, Olesia N
Format: Article
Language:English
Subjects:
Algae
Analysis
Animals
Aquatic microorganisms
Bacillariophyta
Biology
Carbon Isotopes - chemistry
Consumers
Earth Sciences
Fatty acids
Fatty Acids - chemistry
Fish
Food Chain
Food chains
Food webs
Fractionation
Isotope composition
Isotope fractionation
Isotopes
Larva - metabolism
Larvae
Lipids
Microalgae - metabolism
Rivers
Sparus aurata
Stable isotopes
Studies
Trophic levels
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Summary:We studied four-link food chain, periphytic microalgae and water moss (producers), trichopteran larvae (consumers I), gammarids (omnivorous--consumers II) and Siberian grayling (consumers III) at a littoral site of the Yenisei River on the basis of three years monthly sampling. Analysis of bulk carbon stable isotopes and compound specific isotope analysis of fatty acids (FA) were done. As found, there was a gradual depletion in (13)C contents of fatty acids, including essential FA upward the food chain. In all the trophic levels a parabolic dependence of δ(13)C values of fatty acids on their degree of unsaturation/chain length occurred, with 18:2n-6 and 18:3n-3 in its lowest point. The pattern in the δ(13)C differences between individual fatty acids was quite similar to that reported in literature for marine pelagic food webs. Hypotheses on isotope fractionation were suggested to explain the findings.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0034059