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dc.contributor.authorKainz, M.J.
dc.contributor.authorHager, H.H.
dc.contributor.authorRasconi, S.
dc.contributor.authorKahilainen, Kimmo K.
dc.contributor.authorAmundsen, Per-Arne
dc.contributor.authorHayden, B.
dc.date.accessioned2018-03-16T07:41:07Z
dc.date.available2018-03-16T07:41:07Z
dc.date.issued2017-04-03
dc.description.abstractTrophic transfer and retention of dietary compounds are vital for somatic development, reproduction, and survival of aquatic consumers. In this field study, stable carbon and nitrogen isotopes, and fatty acids (FA) contents in invertebrates and fishes of pre-alpine Lake Lunz, Austria, were used to (1) identify the resource use and trophic level of Arctic charr (Salvelinus alpinus), pike (Esox lucius), perch (Perca fluviatilis), brown trout (Salmo trutta), roach (Rutilus rutilus), and minnow (Phoxinus phoxinus) and (2) examine how polyunsaturated fatty acids (PUFA; i.e., omega-3 and -6 PUFA) are related to total lipid status, littoral–pelagic reliance, and trophic position. Stable isotope data suggest that pike, perch, and minnow derived most of their energy from littoral resources, but minnows differed from pike and perch in their trophic position and PUFA composition. The co-occurrence of cyprinids, percids, and pike segregated these fishes into more lipid-rich (roach, minnow) and lipid-poor (pike, percids) species. Although the relatively lipid-poor pike and percids occupied a higher trophic position than cyprinids, there was a concurrent, total lipid-dependent decline in omega-3 and -6 PUFA in these predatory fishes. Results of this lake food-web study demonstrated that total lipids in fish community, littoral–pelagic reliance, and trophic position explained omega-3 and -6 PUFA in dorsal muscle tissues. Omega-3 and -6 PUFA in these fishes decreased with increasing trophic position, demonstrating that these essential FAs did not biomagnify with increasing trophic level. Finally, this lake food-web study provides evidence of fish community-level relationship between total lipid status and PUFA or stable isotope ratios, whereas the strength of such relationships was less strong at the species level.en_US
dc.description.sponsorshipProvincial Government of Lower Austriaen_US
dc.descriptionSource at <a href=https://doi.org/10.1002/ecs2.1753> https://doi.org/10.1002/ecs2.1753 </a>.en_US
dc.identifier.citationKainz, M.J., Hager, H.H., Rasconi, S., Kahilainen, K.K., Amundsen, P.A. & Hayden, B. (2017). Polyunsaturated fatty acids in freshwater fishes increase with total lipids irrespective of feeding sources and trophic position. Ecosphere, 8(4).en_US
dc.identifier.cristinIDFRIDAID 1507907
dc.identifier.doi10.1002/ecs2.1753
dc.identifier.issn2150-8925
dc.identifier.urihttps://hdl.handle.net/10037/12355
dc.language.isoengen_US
dc.publisherEcological Society of Americaen_US
dc.relation.journalEcosphere
dc.relation.projectIDAndre: Provincial Government of Lower Austriaen_US
dc.rights.accessRightsopenAccessen_US
dc.subjectcypriniden_US
dc.subjectfatty acidsen_US
dc.subjectperciden_US
dc.subjectsalmoniden_US
dc.subjectSpecial Feature: Biomarkers in Trophic Ecologyen_US
dc.subjectstable isotopesen_US
dc.subjecttrophic biomarkeren_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Basale biofag: 470en_US
dc.subjectVDP::Mathematics and natural science: 400::Basic biosciences: 470en_US
dc.titlePolyunsaturated fatty acids in freshwater fishes increase with total lipids irrespective of feeding sources and trophic positionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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