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Jaime Otero, Arne J. Jensen, Jan Henning L'Abée-Lund, Nils Chr. Stenseth, Geir O. Storvik, and Leif Asbjørn Vøllestad Contemporary ocean warming and freshwater conditions are related to later sea age at maturity in Atlantic salmon spawning in Norwegian rivers Ecology and Evolution 2

Version of Record online: 28 JUL 2012 | DOI: 10.1002/ece3.337

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Atlantic salmon (Salmo salar) reaches maturity after a single (1SW) or multiple winters at sea (MSW). The proportion of 1SW fish relative to 1SW and 2SW fish pertaining to the same smolt cohort angled in multiple Norwegian rivers has decreased over the cohorts 1991–2005. The increase in age at maturity was related to the increasing sea surface temperature experienced by the fish in autumn during their first year at sea, and to higher water discharge during summer months 1 year ahead of seaward migration.

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