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- Title
Implications of a warming eastern Bering Sea for Bristol Bay sockeye salmon.
- Authors
Farley, Edward V.; Starovoytov, Alexander; Naydenko, Svetlana; Heintz, Ron; Trudel, Marc; Guthrie, Charles; Eisner, Lisa; Guyon, Jeffrey R.
- Abstract
Farley, E. V., Starovoytov, A., Naydenko, S., Heintz, R., Trudel, M., Guthrie, C., Eisner, L., Guyon, J. R. 2011. Implications of a warming eastern Bering Sea for Bristol Bay sockeye salmon. – ICES Journal of Marine Science, 68: 1138–1146.Overwinter survival of Pacific salmon (Oncorhynchus sp.) is believed to be a function of size and energetic status they gain during their first summer at sea. We test this notion for Bristol Bay sockeye salmon (O. nerka), utilizing data from large-scale fisheries and oceanographic surveys conducted during mid-August to September 2002–2008 and from February to March 2009. The new data presented in this paper demonstrate size-selective mortality for Bristol Bay sockeye salmon between autumn and their first winter at sea. Differences in the seasonal energetic signatures for lipid and protein suggest that these fish are not starving, but instead the larger fish caught during winter apparently are utilizing energy stores to minimize predation. Energetic status of juvenile sockeye salmon was also strongly related to marine survival indices and years with lower energetic status apparently are a function of density-dependent processes associated with high abundance of juvenile sockeye salmon. Based on new information regarding eastern Bering Sea ecosystem productivity under a climate-warming scenario, we hypothesize that sustained increases in spring and summer sea temperatures may negatively affect energetic status of juvenile sockeye salmon, potentially resulting in increased overwinter mortality.
- Subjects
BERING Sea; SOCKEYE salmon; SOCKEYE salmon fishing; CLIMATE change; ECOSYSTEM management
- Publication
ICES Journal of Marine Science / Journal du Conseil, 2011, Vol 68, Issue 6, p1138
- ISSN
1054-3139
- Publication type
Article
- DOI
10.1093/icesjms/fsr021