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Fatty acid accumulation in feeding types of a natural freshwater fish population

Scharnweber, Kristin and Chaguaceda, Fernando and Eklov, Peter (2021). Fatty acid accumulation in feeding types of a natural freshwater fish population. Oecologia. 196 , 53-63
[Research article]

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Fatty acids are widely used to study trophic interactions in food web assemblages. Generally, it is assumed that there is a very small modification of fatty acids from one trophic step to another, making them suitable as trophic biomarkers. However, recent literature provides evidence that many fishes possess genes encoding enzymes with a role in bioconversion, thus the capability for bioconversion might be more widespread than previously assumed. Nonetheless, empirical evidence for biosynthesis occurring in natural populations remains scarce. In this study, we investigated different feeding types of perch (Perca fluviatilis) that are specialized on specific resources with different levels of highly unsaturated fatty acids (HUFAs), and analyzed the change between HUFA proportions in perch muscle tissue compared to their resources. Perch showed matching levels to their resources for EPA, but ARA and especially DHA were accumulated. Compound-specific stable isotope analyses helped us to identify the origin of HUFA carbon. Our results suggest that perch obtain a substantial amount of DHA via bioconversion when feeding on DHA-poor benthic resources. Thus, our data indicate the capability of bioconversion of HUFAs in a natural freshwater fish population.

Authors/Creators:Scharnweber, Kristin and Chaguaceda, Fernando and Eklov, Peter
Title:Fatty acid accumulation in feeding types of a natural freshwater fish population
Series Name/Journal:Oecologia
Year of publishing :2021
Page range:53-63
Number of Pages:11
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:Fatty acid conversion, Compound-specific stable isotope analysis, Docosahexaenoic acid, Bioconversion, Trophic upgrading
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Additional ID:
Type of IDID
Web of Science (WoS)000644257500001
ID Code:24375
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:02 Jun 2021 16:23
Metadata Last Modified:02 Jun 2021 16:31

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