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dc.contributor.authorPedersen, Torstein
dc.contributor.authorMikkelsen, Nina
dc.contributor.authorLindstrøm, Ulf
dc.contributor.authorRenaud, Paul Eric
dc.contributor.authorNascimento, Marcela C.
dc.contributor.authorBlanchet, Marie-Anne
dc.contributor.authorEllingsen, Ingrid H.
dc.contributor.authorJørgensen, Lis L.
dc.contributor.authorBlanchet, Hugues
dc.date.accessioned2021-11-02T14:14:51Z
dc.date.available2021-11-02T14:14:51Z
dc.date.issued2021-09-17
dc.description.abstractThe Barents Sea (BS) is a high-latitude shelf ecosystem with important fisheries, high and historically variable harvesting pressure, and ongoing high variability in climatic conditions. To quantify carbon flow pathways and assess if changes in harvesting intensity and climate variability have affected the BS ecosystem, we modeled the ecosystem for the period 1950–2013 using a highly trophically resolved mass-balanced food web model (Ecopath with Ecosim). Ecosim models were fitted to time series of biomasses and catches, and were forced by environmental variables and fisheries mortality. The effects on ecosystem dynamics by the drivers fishing mortality, primary production proxies related to open-water area and capelin-larvae mortality proxy, were evaluated. During the period 1970–1990, the ecosystem was in a phase of overexploitation with low top-predators’ biomasses and some trophic cascade effects and increases in prey stocks. Despite heavy exploitation of some groups, the basic ecosystem structure seems to have been preserved. After 1990, when the harvesting pressure was relaxed, most exploited boreal groups recovered with increased biomass, well-captured by the fitted Ecosim model. These biomass increases were likely driven by an increase in primary production resulting from warming and a decrease in ice-coverage. During the warm period that started about 1995, some unexploited Arctic groups decreased whereas krill and jellyfish groups increased. Only the latter trend was successfully predicted by the Ecosim model. The krill flow pathway was identified as especially important as it supplied both medium and high trophic level compartments, and this pathway became even more important after ca. 2000. The modeling results revealed complex interplay between fishery and variability of lower trophic level groups that differs between the boreal and arctic functional groups and has importance for ecosystem management.en_US
dc.identifier.citationPedersen, Mikkelsen N, Lindstrøm, Renaud PE, Nascimento, Blanchet, Ellingsen, Jørgensen, Blanchet. Overexploitation, Recovery, and Warming of the Barents Sea Ecosystem During 1950–2013. Frontiers in Marine Science. 2021;8:1-22en_US
dc.identifier.cristinIDFRIDAID 1947911
dc.identifier.doi10.3389/fmars.2021.732637
dc.identifier.issn2296-7745
dc.identifier.urihttps://hdl.handle.net/10037/22924
dc.language.isoengen_US
dc.publisherFrontiers Mediaen_US
dc.relation.journalFrontiers in Marine Science
dc.relation.projectIDNorges forskningsråd: 276730en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/NANSEN/276730/Norway/The Nansen Legacy//en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2021 The Author(s)en_US
dc.subjectVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920en_US
dc.subjectVDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920en_US
dc.titleOverexploitation, Recovery, and Warming of the Barents Sea Ecosystem During 1950–2013en_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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