Content, composition, and transfer of polyunsaturated fatty acids in an Arctic lake food web

Guillaume Grosbois; Michael Power; Marlene Evans; Geoff Koehler; Milla Rautio

doi:10.1002/ecs2.3881

journal article Open Access Jan 01, 2022

Content, composition, and transfer of polyunsaturated fatty acids in an Arctic lake food web

Guillaume Grosbois

Michael Power Marlene Evans

Geoff Koehler

Milla Rautio

Ecosphere Vol. 13 No. 1 · Wiley

View at Publisher Save 10.1002/ecs2.3881

Abstract

AbstractFreshwater fish production depends on the production and use of polyunsaturated fatty acids (n‐3 and n‐6 PUFA) from lower trophic levels. Here, we aimed to identify the main trophic pathways that support PUFA content in different fish species (mean 39.7 mg/g dry weight) used in the subsistence fishery of the Inuit community in Greiner Lake near Cambridge Bay (Nunavut, Canada). We used stable isotope and taxon‐specific PUFA stocks, to show that the lake food web was divided into distinctive pelagic and littoral benthic food webs and that different fish species obtained their PUFA from different sources within those food webs. The most concentrated fish in n‐3 PUFA was Arctic char (Salvelinus alpinus) that obtained nutritionally valuable PUFA compounds by feeding on pelagic zooplankton rich in the essential fatty acids EPA and DHA and on littoral prey with lower PUFA content. The pelagic consumer, lake whitefish (Coregonus clupeaformis), that fed on mysids and zooplankton was also rich in n‐3 PUFA. The least concentrated in n‐3 PUFA was lake trout (Salvelinus namaycush) that obtained PUFA from low n‐3 PUFA sticklebacks (Pungitius pungitius) and macroinvertebrates and from n‐3 PUFA‐rich littoral mysids. The benthic PUFA were entirely made of n‐6 fatty acids and no n‐3 PUFA were detected. We further quantified that from the mean daily phytoplankton production of 319 mg C·m−2·d−1, 2.9% was assimilated by zooplankton (9.4 mg C·m−2·d−1) and thereby made available to pelagic fish. The food webs to which fish belonged were supported by PUFA produced in the pelagic and benthic zones but likely complemented by inputs from the watershed. The description of the main PUFA pathways of the Greiner Lake food webs explains for the first time the trophic interactions and underlying mechanisms responsible for the health of the fish community in a high‐Arctic lake.

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Details

Published: Jan 01, 2022
Vol/Issue: 13(1)
License: View

Authors

G

Guillaume Grosbois

Département des Sciences Fondamentales Université du Québec à Chicoutimi Chicoutimi Quebec Canada; Centre d’Études Nordiques (CEN) Université Laval Quebec City Quebec Canada; Groupe de Recherche Interuniversitaire en Limnologie (GRIL) Université de Montréal Montreal Quebec Canada

M

Michael Power

Department of Biology University of Waterloo Waterloo Ontario Canada

M

Marlene Evans

NHRC Stable Isotope Laboratory, Environment and Climate Change Canada Saskatoon Saskatchewan Canada

G

Geoff Koehler

NHRC Stable Isotope Laboratory, Environment and Climate Change Canada Saskatoon Saskatchewan Canada

M

Milla Rautio

Département des Sciences Fondamentales Université du Québec à Chicoutimi Chicoutimi Quebec Canada; Centre d’Études Nordiques (CEN) Université Laval Quebec City Quebec Canada; Groupe de Recherche Interuniversitaire en Limnologie (GRIL) Université de Montréal Montreal Quebec Canada

Funding

Canada Foundation for Innovation

Canada Research Chairs

Natural Sciences and Engineering Research Council of Canada

Polar Knowledge Canada

Cite This Article

Guillaume Grosbois, Michael Power, Marlene Evans, et al. (2022). Content, composition, and transfer of polyunsaturated fatty acids in an Arctic lake food web. Ecosphere, 13(1). https://doi.org/10.1002/ecs2.3881

Content, composition, and transfer of polyunsaturated fatty acids in an Arctic lake food web

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