Contemporary ocean warming and freshwater conditions are related to later sea age at maturity in Atlantic salmon spawning in Norwegian rivers.

Regarding the environmental factors, the first principal component of September SST in the North-east Atlantic, that is the month that gave the better fit in the mixed-effects model in terms of the BIC criteria ( Table S3 ), accounted for 37.8% of the total variance and showed an increasing trend over the time period investigated ( Fig. 2 a).

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