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A continuum of life history tactics in a brown trout (Salmo trutta) population

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Life history tactics of the brown trout (Salmo trutta) population of the Oir River (Normandy, France) were studied using passive integrated transponder (PIT) tagging data of five consecutive cohorts (5900 individuals) monitored between 1995 and 2002. Results demonstrate that (i) life history traits vary among cohorts, chiefly caused by environmental variability, (ii) juvenile growth, particularly second-year growth, plays an important role in the determination of the growing environment and trout exhibit variable migratory behaviour (from remaining in the natal brook to migrating in the sea) related to their juvenile growth rate, and (iii) the description of life history tactics (including juvenile growth, fine-scale migratory behaviour, and reproduction) can be clarified. Tactics are expressed along a continuum in time (age to reproduce) and space (distance of migration). Flexible life history tactics varying with juvenile growth is consistent with previous studies, but the use of empiric data on growth and migration from PIT tagging allows refining the description of life history tactics, taking into account their continuous distribution in time and space.

Les tactiques d'histoire de vie de la population de truite commune (Salmo trutta) de l'Oir (Normandie, France) ont été étudiées par le marquage individuel à l'aide de « PIT tag » de cinq cohortes consécutives (5 900 individus) suivies de 1995 à 2002. Les résultats confirment et démontrent que (i) les traits d'histoire de vie varient entre les cohortes et que cette variabilité peut être reliée principalement aux fluctuations des conditions environnementales, (ii) la croissance juvénile, plus particulièrement celle de la seconde année de vie, est un facteur important dans la détermination de la zone de croissance et les truites possèdent des comportements migratoires variables, allant de la résidence stricte au ruisseau natal jusqu'à la migration en mer, que l'on peut relier à leur taux de croissance juvénile et (iii) la description des tactiques d'histoire de vie (en incluant la croissance juvénile, le comportement migratoire à fine échelle et la reproduction) peut être affinée, les tactiques se distribuant le long d'un continuum temporel (age de reproduction) et spatial (distance de migration). La flexibilité des tactiques d'histoire de vie et leurs liens avec la croissance juvéniles sont confirmés dans cette étude. Cependant l'utilisation de données empiriques sur la croissance et la migration issues du marquage individuel par PIT tag a permis d'améliorer la description des tactiques en prenant en compte leur distribution continue dans le temps et l'espace.

Document Type: Research Article

Publication date: July 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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