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Redside shiner (Richardsonius balteatus) shoals provide a behavioral competitive refuge for subordinate juvenile steelhead trout (Oncorhynchus mykiss)

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We examined the relative effects of zero, three, and nine redside shiner (Richardsonius balteatus) on the aggression-related damage among three juvenile steelhead (Oncorhynchus mykiss) in aquaria at 15 and 20°C. No steelhead died when in the presence of nine redside shiner. When redside shiner were not present, mortality among the smallest steelhead was 80%. Thus, the survival of smaller juvenile steelhead was significantly enhanced by the presence of redside shiner. A second experiment was conducted in 6800-L stream channels at 15°C with natural substrate. In separate trials, 10 and 7 steelhead were held either alone or with 20 redside shiner. In the absence of redside shiner, fin damage was significantly greater among smaller steelhead. In both experiments, if a redside shiner group was present, the smallest steelhead frequently took refuge within the shiner group, thereby avoiding attack by dominant steelhead. We have termed this phenomenon a behavioural competitive refuge.

Nous avons déterminé les effets relatifs de la présence de zéro, trois et neuf Ménés rouges (Richardsonius balteatus) sur l'incidence de dommages dus à l'agression chez trois jeunes Truites arc-en-ciel anadromes (Oncorhynchus mykiss) gardées ensemble en aquarium à 15 et à 20°C. Il n'y avait pas de mortalité chez la truite en présence de neuf ménés. En l'absence des ménés, la mortalité chez les plus petites truites était de 80%. Ainsi, la survie des petites truites était significativement améliorée par la présence des ménés. Une seconde expérience a été montée dans des canaux artificiels de 6800 L à 15°C sur substrat naturel, dans laquelle 10 ou 7 truites ont été gardées soit seules, soit en présence de 20 ménés. En l'absence des ménés, les dommages aux nageoires des plus petites truites étaient significativement plus importants. Dans les deux expériences, lorsqu'un groupe de ménés était présent, la plus petite truite se réfugiait souvent au milieu du banc de ménés, échappant ainsi à l'attaque de la truite dominante. Nous appelons ce phénomène un refuge comportemental contre la compétition.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2001-02-01

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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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