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Polyunsaturated fatty acids in fish tissues more closely resemble algal than terrestrial diet sources

Authors
  • Ebm, Nadine1, 2
  • Guo, Fen3
  • Brett, Michael T.4
  • Bunn, Stuart E.5
  • Kainz, Martin J.1, 6
  • 1 WasserCluster Lunz – Inter-university Center for Aquatic Ecosystem Studies, 3293 Lunz Am See, Austria
  • 2 University of Vienna,
  • 3 The Chinese University of Hong Kong,
  • 4 University of Washington,
  • 5 Griffith University,
  • 6 Danube University Krems,
Type
Published Article
Journal
Hydrobiologia
Publisher
Springer-Verlag
Publication Date
Nov 16, 2020
Volume
848
Issue
2
Pages
371–383
Identifiers
DOI: 10.1007/s10750-020-04445-1
PMID: 33343020
PMCID: PMC7738338
Source
PubMed Central
Keywords
License
Unknown

Abstract

The River Continuum Concept implies that consumers in headwater streams have greater dietary access to terrestrial basal resources, but recent studies have highlighted the dietary importance of high-quality algae. Algae provide consumers with physiologically important omega-3 (n-3) polyunsaturated fatty acids (PUFA), particularly eicosapentaenoic acid (EPA). However, terrestrial plants and most benthic stream algae lack the long-chain (LC) n-3 PUFA docosahexaenoic acid (DHA, 22:6n-3), which is essential for neural development in fish and other vertebrates. We sampled subalpine streams to investigate how the PUFA composition of neural (brain and eyes), muscle, and liver tissues of freshwater fish is related to their potential diets (macroinvertebrates, epilithon, fresh and conditioned terrestrial leaves). The PUFA composition of consumers was more similar to epilithon than to terrestrial leaves. Storage lipids of eyes most closely resembled dietary PUFA (aquatic invertebrates and algae). However, DHA and arachidonic acid (ARA, 20:4n-6) were not directly available in the diet but abundant in organs. This implies that algal PUFA were selectively retained or were produced internally via enzymatic PUFA conversion by aquatic consumers. This field study demonstrates the nutritional importance of algal PUFA for neural organs in aquatic consumers of headwater regions. Electronic supplementary material The online version of this article (10.1007/s10750-020-04445-1) contains supplementary material, which is available to authorized users.

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