ATLANTIC SALMON VARIABILITY: THE EFFECTS OF OCEAN, FRESHWATER AND HUMAN IMPACTS USING MULTIPLE TIME-SERIES OF ROD CATCHES FROM NORWEGIAN AND SCOTTISH RIVERS

Abstract : Atlantic salmon (Salmo salar) fishing is one of the most important recreational fisheries in both Norway and Scotland and it has become an important factor in outdoor activities, with salmon angling estimated annual value to be approximately 1 billion NOK in Norway and £70 million in Scotland. The Atlantic salmon is a charismatic anadromous fish utilizing freshwater habitats for spawning and early development, and marine habitats for its main somatic growth. This species is fairly long-lived and is exposed to a large number of human encroachments both in freshwaters and in the sea. It has experienced strong declines worldwide during the last century, although many viable populations remain in the central and northern parts of the species' range. The largest component of natural mortality in the marine environment occurs during the first year at sea, indeed, survival has often been associated with sea surface temperature, which presumably modulates growth rates and controls recruitment. Moreover, yearly fluctuations of one-sea-winter fish are related with sea temperature. Furthermore, the current ocean warming in the foraging areas contributes to delay maturation and decreases growth conditions. In addition, local extinction or strong reductions in production have been partly attributed to acidification and other kinds of pollution, damming, exotic parasites and the effects of increased aquaculture. Understanding the complexity on how within and among river factors affect the dynamics of Atlantic salmon populations will improve our ability to manage the wild resource effectively in the face of current changes in environmental trends.
Type de document :
Communication dans un congrès
ClimECO2 International Summer School - Oceans, Marine Ecosystems, and Society facing Climate Change, Aug 2010, Brest, France
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http://hal.univ-brest.fr/hal-00502816
Contributeur : Ivo Grigorov <>
Soumis le : jeudi 15 juillet 2010 - 17:27:36
Dernière modification le : jeudi 15 juillet 2010 - 17:27:36

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  • HAL Id : hal-00502816, version 1

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Jaime Otero, Arne Jensen, Jan Henning L'Abée-Lund, Nils Chr. Stenseth, Geir O. Storvik, et al.. ATLANTIC SALMON VARIABILITY: THE EFFECTS OF OCEAN, FRESHWATER AND HUMAN IMPACTS USING MULTIPLE TIME-SERIES OF ROD CATCHES FROM NORWEGIAN AND SCOTTISH RIVERS. ClimECO2 International Summer School - Oceans, Marine Ecosystems, and Society facing Climate Change, Aug 2010, Brest, France. 〈hal-00502816〉

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