Stable Isotope Composition of Fatty Acids in Organisms of Different Trophic Levels in the Yenisei River

Тип публикации: статья из журнала

Год издания: 2012

Идентификатор DOI: 10.1371/journal.pone.0034059

Ключевые слова: carbon 13, fatty acid, carbon, Apatania crymophila, article, benthos, Eulimnogammarus viridis, fatty acid analysis, fatty acid desaturation, Fontinalis antipyretica, food chain, food web, freshwater fish, isotope analysis, lipid composition, microalga, moss, nonhuman, pelagic zone, river ecosystem, Russian Federation, stable isotope analysis, Thymallus arcticus, trophic level, animal, chemistry, larva, metabolism, river, Bryophyta, Gammaridae, Trichoptera, Animals, Carbon Isotopes, Fatty Acids, Microalgae, Rivers

Аннотация: 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 C-13 contents of fatty acids, including essential FA upward the food chain. In all the trophic levels a parabolic dependence of delta C-13 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 delta C-13 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.

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Издание

Журнал: PLOS ONE

Выпуск журнала: Vol. 7, Is. 3

ISSN журнала: 19326203

Место издания: SAN FRANCISCO

Издатель: PUBLIC LIBRARY SCIENCE

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