Transactions of the American Fisheries Society 133:1396–1412, 2004 q Copyright by the American Fisheries Society 2004 The Influence of Climate on the Stock and Recruitment of Pink
Abstract.—The relationships between the spawning stock and the subsequent recruitment of pink salmon Oncorhynchus gorbuscha and sockeye salmon O. nerka from the Fraser River improve significantly when the data are separated by climate and ocean regimes. Our analyses show changes in these relationshi...
| Main Authors: | , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Text |
| Language: | English |
| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.573.7404 http://www.pac.dfo-mpo.gc.ca/science/people-gens/beamish/pdf_files/3.pdf |
| Summary: | Abstract.—The relationships between the spawning stock and the subsequent recruitment of pink salmon Oncorhynchus gorbuscha and sockeye salmon O. nerka from the Fraser River improve significantly when the data are separated by climate and ocean regimes. Our analyses show changes in these relationships as regimes shift, indicating that the trend in marine survival of pink and sockeye salmon changes on a decadal scale. In general, the climate and ocean regime from 1977 to 1988 was productive for pink and sockeye salmon. However, the regime in the 1990s was characterized by reduced productivity for both species. The occurrence of a natural shift in the trend of pink and sockeye salmon production on a decadal scale should be incorporated into the management of Pacific salmon stocks to ensure that annual catches, escapements, and planned stock abundances are consistent with the productivity of a particular regime. Ricker (1954, 1958a) proposed a dome-shaped relationship between the abundance of a spawning stock of Pacific salmon (Oncorhynchus spp.) and the subsequent return of adults. Similarly, Bev-erton and Holt (1957) used an asymptotic curve |
|---|