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dc.rights.licenseopenen_US
dc.contributor.authorPEDERSEN, Torstein
dc.contributor.authorMIKKELSEN, Nina
dc.contributor.authorLINDSTRØM, Ulf
dc.contributor.authorRENAUD, Paul E.
dc.contributor.authorNASCIMENTO, Marcela C.
dc.contributor.authorBLANCHET, Marie-Anne
dc.contributor.authorELLINGSEN, Ingrid H.
dc.contributor.authorJØRGENSEN, Lis L.
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorBLANCHET, Hugues
IDREF: 086160648
dc.date.accessioned2023-07-12T10:03:11Z
dc.date.available2023-07-12T10:03:11Z
dc.date.issued2021-09-17
dc.identifier.issn2296-7745en_US
dc.identifier.urioai:crossref.org:10.3389/fmars.2021.732637
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/183383
dc.description.abstractEnThe 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.
dc.language.isoENen_US
dc.rightsAttribution 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/us/*
dc.sourcecrossref
dc.subject.enecosystem dynamics
dc.subject.enmass-balance modeling
dc.subject.entrophic flows
dc.subject.enenvironmental drivers
dc.subject.ensequential depletion
dc.subject.enfood web
dc.subject.enprimary production variability
dc.title.enOverexploitation, Recovery, and Warming of the Barents Sea Ecosystem During 1950–2013
dc.typeArticle de revueen_US
dc.identifier.doi10.3389/fmars.2021.732637en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalFrontiers in Marine Scienceen_US
bordeaux.volume8en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamECOBIOCen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcedissemin
hal.identifierhal-04160199
hal.version1
hal.date.transferred2023-07-12T10:03:31Z
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exporttrue
workflow.import.sourcedissemin
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