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dc.contributor.authorJonsson, Bror
dc.contributor.authorJonsson, Nina
dc.contributor.authorAlbretsen, Jon
dc.date.accessioned2018-01-17T12:53:15Z
dc.date.available2018-01-17T12:53:15Z
dc.date.created2016-01-05T14:03:53Z
dc.date.issued2016
dc.identifier.citationJournal of Fish Biology. 2016, 88 (2), 618-637.nb_NO
dc.identifier.issn0022-1112
dc.identifier.urihttp://hdl.handle.net/11250/2477973
dc.description.abstractAnnual mean total length (LT) of wild one-sea-winter (1SW) Atlantic salmon Salmo salar of the Norwegian River Imsa decreased from 63 to 54 cm with a corresponding decrease in condition factor (K) for cohorts migrating to sea from 1976 to 2010. The reduction in LT is associated with a 40% decline in mean individual mass, from 2 to 1⋅2 kg. Hatchery fish reared from parental fish of the same population exhibited similar changes from 1981 onwards. The decrease in LT correlated negatively with near-surface temperatures in the eastern Norwegian Sea, thought to be the main feeding area of the present stock. Furthermore, S. salar exhibited significant variations in the proportion of cohorts attaining maturity after only one winter in the ocean. The proportion of S. salar spawning as 1SW fish was lower both in the 1970s and after 2000 than in the 1980s and 1990s associated with a gradual decline in post-smolt growth and smaller amounts of reserve energy in the fish. In wild S. salar, there was a positive association between post-smolt growth and the sea survival back to the River Imsa for spawning. In addition, among smolt year-classes, there were significant positive correlations between wild and hatchery S. salar in LT, K and age at maturity. The present changes may be caused by ecosystem changes following the collapse and rebuilding of the pelagic fish abundance in the North Atlantic Ocean, a gradual decrease in zooplankton abundance and climate change with increasing surface temperature in the Norwegian Sea. Thus, the observed variation in the life-history traits of S. salar appears primarily associated with major changes in the pelagic food web in the ocean. climate change; condition factor; growth; sea survival; temperature; time series. © 2016 The Fisheries Society of the British Islesnb_NO
dc.language.isoengnb_NO
dc.subjectTidsrekkernb_NO
dc.subjectTime seriesnb_NO
dc.subjectVekstnb_NO
dc.subjectGrowthnb_NO
dc.subjectTemperaturnb_NO
dc.subjectTemperaturenb_NO
dc.subjectClimate changenb_NO
dc.subjectKlimaendringernb_NO
dc.titleEnvironmental change influences the life history of salmon Salmo salar in the North Atlantic Oceannb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.subject.nsiVDP::Marinbiologi: 497nb_NO
dc.subject.nsiVDP::Marine biology: 497nb_NO
dc.source.pagenumber618-637nb_NO
dc.source.volume88nb_NO
dc.source.journalJournal of Fish Biologynb_NO
dc.source.issue2nb_NO
dc.identifier.doi10.1111/jfb.12854
dc.identifier.cristin1306298
dc.relation.projectNorges forskningsråd: 225014nb_NO
cristin.unitcode7511,6,0,0
cristin.unitnameOslo
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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