Polyunsaturated fatty acids in fishes increase with total lipids irrespective of feeding sources and trophic position

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Kainz , M J , Hager , H H , Rasconi , S , Kahilainen , K K , Amundsen , P -A & Hayden , B 2017 , ' Polyunsaturated fatty acids in fishes increase with total lipids irrespective of feeding sources and trophic position ' , Ecosphere , vol. 8 , no. 4 , 01753 . https://doi.org/10.1002/ecs2.1753

Title: Polyunsaturated fatty acids in fishes increase with total lipids irrespective of feeding sources and trophic position
Author: Kainz, M. J.; Hager, H.H.; Rasconi, S.; Kahilainen, K. K.; Amundsen, P. -A.; Hayden, B.
Contributor: University of Helsinki, Environmental Sciences
Date: 2017-04
Language: eng
Number of pages: 13
Belongs to series: Ecosphere
ISSN: 2150-8925
URI: http://hdl.handle.net/10138/189052
Abstract: Trophic 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.
Subject: cyprinid
fatty acids
percid
salmonid
Special Feature: Biomarkers in Trophic Ecology
stable isotopes
trophic biomarker
STABLE-ISOTOPES
FOOD-WEB
GROWTH
MUSCLE
NICHE
LAKE
HABITATS
PATHWAYS
CARBON
MODEL
1181 Ecology, evolutionary biology
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