Skip to main content

Recruitment and survival of Northeast Pacific Ocean fish stocks: temporal trends, covariation, and regime shifts

Buy Article:

$50.00 plus tax (Refund Policy)

Abstract:

Two measures of productivity for fish stocks (recruitment and stock–recruit residuals) within two large marine ecosystems (Gulf of Alaska and eastern Bering Sea – Aleutian Islands) showed significant positive covariation within several groups of species and significant negative covariation between certain others. For example, stock–recruit residuals of gadids (Gadidae) in the Bering Sea were inversely related to those of shelf flatfishes (Pleuronectidae), suggesting that environmental forcing affects these groups in opposite ways. Salmon (Oncorhynchus spp.), Pacific herring (Clupea pallasii), and groundfish stocks each showed strong patterns of covariation within these taxonomic groups and within ecosystems, and both salmon and groundfish stocks showed positive covariation between the two ecosystems. However, we found little evidence of covariation between salmon and herring stocks or between these stocks and demersal stocks. Recruitment and stock–recruit residuals in individual stocks did not show a consistent response to known climatic regime shifts. However, combined indices of productivity across stocks showed decadal-scale variability (regime-like patterns), suggesting that both pelagic productivity (mostly salmon) and demersal productivity increased in response to the well-documented 1976–1977 climatic regime shift, whereas the 1988–1989 regime shift produced inconsistent or short-lived responses.

Deux mesures de la productivité des stocks de poissons (résidus du recrutement et des stocks–recrues) dans deux grands écosystèmes marins (golfe d'Alaska et est de la mer de Bering – îles Aléoutiennes) affichent une covariation positive significative chez plusieurs groupes d'espèces et une covariation négative significative chez certains autres. Par exemple, les résidus stocks–recrues des gadidés (Gadidae) de la mer de Bering sont en relation inverse avec ceux des poissons plats du plateau continental (Pleuronectidae), ce qui laisse croire que le forçage environnemental affecte ces groupes de manière inverse. Les stocks de saumons (Oncorhynchus spp.), de harengs (Clupea pallasii) et de poissons de fond montrent tous de forts patrons de covariation à l'intérieur de ces groupes taxonomiques et au sein des écosystèmes; les stocks de saumons et de poissons de fond montrent tous les deux une covariation positive entre les deux écosystèmes. Nous ne trouvons que peu d'indication de covariation entre les stocks de harengs et de saumons ou entre ces stocks et les stocks benthiques. Les résidus du recrutement et des stocks–recrues dans les stocks individuels n'offrent pas de réponse uniforme aux changements connus du régime climatique. Cependant, les indices combinés de productivité dans tous les stocks montrent une variabilité (patrons typiques d'un régime) à l'échelle de la décennie; cela indique que la productivité pélagique (surtout du saumon) et la productivité profonde ont augmenté toutes les deux en réaction au changement de régime climatique bien étudié de 1976–1977, alors que le changement de régime de 1988–1989 a produit des réactions irrégulières ou de courte durée.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2007-06-29

More about this publication?
  • 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.
  • Information for Authors
  • Submit a Paper
  • Subscribe to this Title
  • Terms & Conditions
  • Sample Issue
  • Reprints & Permissions
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more