The effect of flow regime on the occurrence of interference and exploitative competition in a salmonid species, white-spotted char (Salvelinus leucomaenis)

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We examined the effect of flow regime on the occurrence of interference and exploitative competition in a salmonid species, white-spotted char (Salvelinus leucomaenis). In the lotic treatment, char showed typical consequences of interference competition (i.e., fish aggressively defended their foraging positions, and individuals occupying the most profitable positions grew fastest). In the lentic treatment, however, char behavior was consistent with exploitative competition; fish cruised over a larger area in search of food resources and showed limited aggression and no evidence of a dominance hierarchy. Our results indicate that white-spotted char showed interference competition more commonly than exploitative competition in the lotic habitat and vice versa in the lentic habitat.

Nous examinons l’effet du régime d’écoulement sur la présence de compétition d’interférence et d’exploitation chez une espèce de salmonidé, l’omble à taches blanches (Salvelinus leucomaenis). Dans les conditions expérimentales d’eau courante, les ombles affichent les conséquences typiques de la compétition d’interférence (c’est-à-dire que les poissons défendent avec agressivité leurs sites d’alimentation, et les individus occupant les sites les plus favorables croissent le plus vite). En revanche, dans des conditions expérimentales d’eau stagnante, les poissons explorent de grandes surfaces en quête de ressources alimentaires, manifestent peu d’agressivité et il n’y a pas d’indication de hiérarchie de dominance. Nos résultats indiquent que l’omble à taches blanches présente plus communément une compétition d’interférence qu’une compétition d’exploitation dans l’habitat lotique et l’inverse dans l’habitat lénitique.

Document Type: Research Article

Publication date: November 1, 2010

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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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