Interacting effects of behavior and oceanography on growth in salmonids with examples for coho salmon (Oncorhynchus kisutch)

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Abstract:

Positive and negative relationships between pre- and post-smolt growth rates in salmonids have been observed, but the mechanisms underlying these relationships are not understood. We hypothesize that growth at sea is controlled by interactions between behavior and ocean conditions and that no one relationship is correct. We present a growth model with habitat-specific rates of anabolism that allow resource acquisition to vary in response to the behavior–environment interaction. Our model predicts positive relationships between pre- and post-smolt growth rates when ocean resources have clumped, defensible distributions under which conditions that aggressive behaviors facilitate increased access to those resources. Negative relationships are predicted when resources are dispersed and aggressive behaviors are ineffective. We present data relating pre- and post-smolt growth rates for more than 15 stocks of coho salmon (Oncorhynchus kisutch). These data indicate that shortly after out-migrating, aggressive behaviors are not effective for securing resources in the ocean (i.e., there are negative or no relationships between pre- and post-smolt growth rates). As coho spend more time at sea, however, variability in environmental conditions can elicit a variety of growth responses.

Il est possible d'observer des relations positives et des relations négatives entre la croissance des présaumoneaux et celle des postsomoneaux, mais les mécanismes sous-jacents à ces relations ne sont pas connus. Nous posons en hypothèse que la croissance en mer est contrôlée par les interactions entre le comportement et les conditions océaniques et qu'aucune relation particulière n'est la bonne. Nous présentons un modèle de croissance avec des taux d'anabolisme spécifiques aux habitats qui permet à l'acquisition de ressources de varier en fonction de l'interaction comportement–environnement. Notre modèle prédit des relations positives entre les taux de croissance des présaumoneaux et des postsaumoneaux lorsque les ressources océaniques ont des répartitions contagieuses et défendables et que les comportements d'agressivité facilitent un accès accru à ces ressources. Il prédit des relations négatives lorsque les ressources sont dispersées et que les comportements agressifs sont inefficaces. Nous présentons des données qui mettent en relation les taux de croissance des présaumoneaux et des postsaumoneaux chez 15 stocks de saumons coho (Oncorhynchus kisutch). Ces données indiquent que, peu après l'émigration vers l'océan, les comportements agressifs ne sont pas efficaces pour procurer les ressources océaniques (c.-à-d., les relations entre les taux de croissance des présaumoneaux et des postsaumoneaux sont négatives ou nulles). À mesure que les saumons coho passent plus de temps en mer, la variabilité des conditions du milieu peut provoquer une variété de réponses de croissance.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: June 1, 2005

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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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