Content, composition, and transfer of polyunsaturated fatty acids in an Arctic lake food web
Abstract Freshwater 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 subsiste...
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crwiley:10.1002/ecs2.3881 2024-06-23T07:50:02+00:00 Content, composition, and transfer of polyunsaturated fatty acids in an Arctic lake food web Grosbois, Guillaume Power, Michael Evans, Marlene Koehler, Geoff Rautio, Milla Natural Sciences and Engineering Research Council of Canada Canada Foundation for Innovation Canada Research Chairs Polar Knowledge Canada 2022 http://dx.doi.org/10.1002/ecs2.3881 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ecs2.3881 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ecs2.3881 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.1002/ecs2.3881 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Ecosphere volume 13, issue 1 ISSN 2150-8925 2150-8925 journal-article 2022 crwiley https://doi.org/10.1002/ecs2.3881 2024-05-31T08:15:58Z Abstract Freshwater 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. Article in Journal/Newspaper Arctic Cambridge Bay inuit Nunavut Phytoplankton Salvelinus alpinus Zooplankton Wiley Online Library Arctic Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) Cambridge Bay ENVELOPE(-105.130,-105.130,69.037,69.037) Canada Greiner Lake ENVELOPE(-104.917,-104.917,69.200,69.200) Nunavut Ecosphere 13 1 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Freshwater 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. |
author2 |
Natural Sciences and Engineering Research Council of Canada Canada Foundation for Innovation Canada Research Chairs Polar Knowledge Canada |
format |
Article in Journal/Newspaper |
author |
Grosbois, Guillaume Power, Michael Evans, Marlene Koehler, Geoff Rautio, Milla |
spellingShingle |
Grosbois, Guillaume Power, Michael Evans, Marlene Koehler, Geoff Rautio, Milla Content, composition, and transfer of polyunsaturated fatty acids in an Arctic lake food web |
author_facet |
Grosbois, Guillaume Power, Michael Evans, Marlene Koehler, Geoff Rautio, Milla |
author_sort |
Grosbois, Guillaume |
title |
Content, composition, and transfer of polyunsaturated fatty acids in an Arctic lake food web |
title_short |
Content, composition, and transfer of polyunsaturated fatty acids in an Arctic lake food web |
title_full |
Content, composition, and transfer of polyunsaturated fatty acids in an Arctic lake food web |
title_fullStr |
Content, composition, and transfer of polyunsaturated fatty acids in an Arctic lake food web |
title_full_unstemmed |
Content, composition, and transfer of polyunsaturated fatty acids in an Arctic lake food web |
title_sort |
content, composition, and transfer of polyunsaturated fatty acids in an arctic lake food web |
publisher |
Wiley |
publishDate |
2022 |
url |
http://dx.doi.org/10.1002/ecs2.3881 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ecs2.3881 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ecs2.3881 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.1002/ecs2.3881 |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) ENVELOPE(-105.130,-105.130,69.037,69.037) ENVELOPE(-104.917,-104.917,69.200,69.200) |
geographic |
Arctic Arctic Lake Cambridge Bay Canada Greiner Lake Nunavut |
geographic_facet |
Arctic Arctic Lake Cambridge Bay Canada Greiner Lake Nunavut |
genre |
Arctic Cambridge Bay inuit Nunavut Phytoplankton Salvelinus alpinus Zooplankton |
genre_facet |
Arctic Cambridge Bay inuit Nunavut Phytoplankton Salvelinus alpinus Zooplankton |
op_source |
Ecosphere volume 13, issue 1 ISSN 2150-8925 2150-8925 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/ecs2.3881 |
container_title |
Ecosphere |
container_volume |
13 |
container_issue |
1 |
_version_ |
1802640777661120512 |