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Polyunsaturated fatty acids in fish tissues more closely resemble algal than terrestrial diet sources.
Ebm, Nadine; Guo, Fen; Brett, Michael T; Bunn, Stuart E; Kainz, Martin J.
Afiliação
  • Ebm N; WasserCluster Lunz - Inter-university Center for Aquatic Ecosystem Studies, 3293 Lunz Am See, Austria.
  • Guo F; Functional and Evolutionary Ecology, Faculty of Life Sciences, University of Vienna, 1090 Vienna, Austria.
  • Brett MT; Simon F.S. Li Marine Science Laboratory, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China.
  • Bunn SE; Department of Civil and Environmental Engineering, University of Washington, Seattle, WA 98195 USA.
  • Kainz MJ; Australian Rivers Institute, Griffith University, Nathan, QLD 4111 Australia.
Hydrobiologia ; 848(2): 371-383, 2021.
Article em En | MEDLINE | ID: mdl-33343020
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.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Áustria

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Áustria