The potential of fatty acid isotopes to trace trophic transfer in aquatic food-webs

Journal article


Burian, Alfred, Nielsen, Jens M., Hansen, Thomas, Bermudez, Rafael and Winder, Monika 2020. The potential of fatty acid isotopes to trace trophic transfer in aquatic food-webs. Phylosophical Transactions of the Royal Society B. 375 (1804), p. 20190652. https://doi.org/10.1098/rstb.2019.0652
AuthorsBurian, Alfred, Nielsen, Jens M., Hansen, Thomas, Bermudez, Rafael and Winder, Monika
Abstract

Compound-specific isotope analyses (CSIA) of fatty acids (FA) constitute a promising tool for tracing energy flows in food-webs. However, past applications of FA-specific carbon isotope analyses have been restricted to a relatively coarse food-source separation and mainly quantified dietary contributions from different habitats. Our aim was to evaluate the potential of FA-CSIA to provide high-resolution data on within-system energy flows using algae and zooplankton as model organisms. First, we investigated the power of FA-CSIA to distinguish among four different algae groups, namely cyanobacteria, chlorophytes, haptophytes and diatoms. We found substantial within-group variation but also demonstrated that δ13C of several FA (e.g. 18:3ω3 or 18:4ω3) differed among taxa, resulting in group-specific isotopic fingerprints. Second, we assessed changes in FA isotope ratios with trophic transfer. Isotope fractionation was highly variable in daphnids and rotifers exposed to different food sources. Only δ13C of nutritionally valuable poly-unsaturated FA remained relatively constant, highlighting their potential as dietary tracers. The variability in fractionation was partly driven by the identity of food sources. Such systematic effects likely reflect the impact of dietary quality on consumers' metabolism and suggest that FA isotopes could be useful nutritional indicators in the field. Overall, our results reveal that the variability of FA isotope ratios provides a substantial challenge, but that FA-CSIA nevertheless have several promising applications in food-web ecology. This article is part of the theme issue ‘The next horizons for lipids as ‘trophic biomarkers’: evidence and significance of consumer modification of dietary fatty acids’.

KeywordsGeneral Biochemistry, Genetics and Molecular Biology; General Agricultural and Biological Sciences; Fatty acids
Year2020
JournalPhylosophical Transactions of the Royal Society B
Philosophical Transactions of the Royal Society B: Biological Sciences
Journal citation375 (1804), p. 20190652
PublisherThe Royal Society
ISSN0962-8436
1471-2970
Digital Object Identifier (DOI)https://doi.org/10.1098/rstb.2019.0652
Web address (URL)http://hdl.handle.net/10545/624928
https://royalsociety.org/-/media/journals/author/Licence-to-Publish-20062019-final.pdf
http://creativecommons.org/licenses/by-nc-sa/4.0/
hdl:10545/624928
Publication dates15 Jun 2020
Publication process dates
Deposited25 Jun 2020, 09:01
Accepted25 Feb 2020
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Attribution-NonCommercial-ShareAlike 4.0 International

ContributorsUniversity of Derby, Stockholm University, Helmholtz Centre for Ocean Research Kiel (GEOMAR), Kiel, Germany and Escuela Superior Politécnica del Litoral, ESPOL, Guayaquil, Ecuador
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