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Synchrony in marine growth among Atlantic salmon (Salmo salar) populations

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More synchronous growth was observed between close, than more distantly separated populations of Atlantic salmon (Salmo salar), during both the first and the second year at sea. The marine growth of seven Norwegian populations, located between 60°N and 70°N, were correlated with sea surface temperatures (SSTs) in the Barents Sea, the Norwegian Sea, and the North Sea, and it was found that growth correlated best with the water temperatures in the area located closest to their home river. Growth was also compared with three broad-scale climate indices (North Atlantic Oscillation (NAO), Atlantic Multidecadal Oscillation, and subpolar gyre), with the strongest relationship occurring with the NAO index. However, SSTs explained more of the variability than the climatic indices did. Growth increment for the first year, but not the second year, was higher for southern than northern populations, mainly because of later smolt migration to sea in the north, and hence, a shorter growth season. For multi-sea-winter fish, all populations except one had a negative trend in growth with years for both the first and the second year at sea. For the second year at sea, this was most pronounced after the beginning of the 1980s. This is in accordance with the negative trend in pre-fishery abundance of adult salmon during the same period.

On observe plus de croissance synchronisée entre les populations adjacentes que plus éloignées chez le saumon atlantique (Salmo salar), tant durant la première que la seconde année en mer. Nous avons mis en corrélation la croissance en mer de sept populations norvégiennes, établies entre 60°N et 70°N, et les températures de surface de la mer (SST) dans la mer de Barents, la mer de Norvège et la mer du Nord; la croissance est le mieux corrélée avec les températures des sites situés le plus près de leur rivière natale. Nous avons aussi comparé la croissance avec trois indices climatiques à grande échelle (l'oscillation nord-atlantique (NAO), l'oscillation atlantique multidécennale et le tourbillon subpolaire) et la relation la plus forte s'établit avec l'indice NAO. Cependant, les SST expliquent une plus grande partie de la variabilité que les indices climatiques. L'incrément de la croissance pour la première année, mais non pour la seconde, est plus élevé pour les populations du sud que pour celles du nord, surtout à cause de la migration plus tardive des saumoneaux vers la mer dans le nord et ainsi, de la période de croissance plus courte. Chez les poissons qui passent plusieurs hivers en mer, toutes les populations, sauf une, affichent une tendance négative de la croissance en fonction des années, tant pour la première que pour la deuxième année en mer. Pour la deuxième année en mer, la tendance est plus prononcée après le début des années 1980. Cela concorde avec la tendance négative dans l'abondance des saumons adultes pendant la même période.

Document Type: Research Article

Publication date: March 1, 2011

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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