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Spatial and temporal stability of commercial groundfish assemblages off Oregon and Washington as inferred from Oregon trawl logbooks

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Abstract:

Spatial and temporal characteristics of species compositions for 15 major commercial groundfish species off Oregon and Washington (U.S.A.) were studied using Oregon bottom trawl logbook data from 1987 to 1993. Screening procedures to remove questionable data from the original logbook files resulted in the exclusion of information from 46% of the total available tows. Two multivariate methods, detrended correspondence analysis and Ward's hierarchical cluster analysis, were used to derive species ordinations and groupings. A general linear model developed for the primary detrended correspondence analysis axis scores showed that the species compositions were strongly correlated with depth and minimally correlated with the other environmental variables examined (latitude, month, and year). However, there were distinct seasonal changes in species composition at the shallower depths, consistent with the movement of deepwater species onto the shelf during summer. Annual trends in the species compositions were not evident even though the study region is very dynamic oceanographically and was heavily fished during the study period.

L'étude de données tirées de journaux de pêche de chalutiers de fond en Oregon de 1987 à 1993 a permis de décrire les caractéristiques spatiales et temporelles des associations d'espèces chez 15 poissons benthiques de grande importance économique sur la côte de l'Oregon et du Washington (É.-U.). Le tri préliminaire visant à retirer les données douteuses des fichiers originaux a conduit à l'exclusion d'informations dans 46% des séries disponibles. Deux méthodes multidimensionnelles, l'analyse des correspondances redressée et l'analyse de groupement hiérarchique de Ward, ont servi à établir des ordinations et des regroupements d'espèces. Un modèle linéaire général basé sur les positions sur le premier axe de l'analyse des correspondances redressée a révélé que la composition des espèces était fortement reliée à la profondeur, mais peu associée aux autres variables de l'environnement examinées (latitude, mois et année). Il y avait des changements saisonniers distincts dans la composition spécifique aux profondeurs les moins grandes, ce qui correspond à la remontée des poissons d'eau profonde sur le plateau continental en été. Nous n'avons observé aucune tendance annuelle marquée, bien que la région d'étude soit océanographiquement très dynamique et que la pêche y ait été intensive au cours de l'étude.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: December 1, 2000

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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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