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Spatial covariation in survival rates of Northeast Pacific pink salmon (Oncorhynchus gorbuscha)

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Abstract:

We examined spatial patterns of covariation in indices of survival rate (residuals from the best-fit stock- recruitment curve) across four decades among 43 wild pink salmon (Oncorhynchus gorbuscha) stocks from 14 geographical regions in Washington, British Columbia, and Alaska. We found strong evidence of positive covariation among stocks within each region and between certain adjacent regions (e.g., correlations from 0.3 to 0.7) but no evidence of covariation between stocks of distant regions (e.g., separated by 1000 km or more). This suggests that important environmental processes affecting temporal variation in survival rates of pink salmon from spawners to recruits operate at regional spatial scales rather than at the larger ocean basin scale. Based on limited fry abundance data, we found that this covariation in spawner-to-recruit survival rates may be strongly influenced by marine processes.

Nous avons examiné la structure spatiale de la covariation des indices des taux de survie (résidus de la courbe stock-recrutement la mieux ajustée) sur une période de 40 ans chez 43 stocks sauvages de Saumons roses (Oncorhynchus gorbuscha) de 14 régions géographiques du Washington, de la Colombie-Britannique et de l'Alaska. Il existe de fortes indications de l'existence d'une covariation positive entre les stocks dans chacune des régions et entre certaines régions adjacentes (e.g., des corrélations de 0,3 à 0,7), mais aucune évidence de covariation entre les stocks de régions éloignées (e.g., séparées par 1000 km ou plus). Cela laisse croire que d'importants mécanismes environnementaux, qui affectent la variation temporelle des taux de survie des géniteurs aux recrues chez le Saumon rose, agissent à des échelles spatiales régionales plutôt qu'à l'échelle plus large du bassin océanique. Des données restreintes sur l'abondance des alevins nous amènent à conclure que cette covariation dans la survie des géniteurs aux recrues est peut-être fortement influencée par les processus marins.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2001-08-01

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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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