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Lack of genetic differentiation between anadromous and resident sympatric brown trout (Salmo trutta) in a Normandy population

Published online by Cambridge University Press:  15 March 2005

Katia Charles
Affiliation:
UMR INRA-Agrocampus Rennes Ecobiologie et Qualité des Hydrosystèmes Continentaux, 65 rue de St Brieuc, 35042 Rennes Cedex, France
René Guyomard
Affiliation:
INRA Laboratoire de Génétique des Poissons, Domaine de Vilvert, 78352 Jouy-en-Josas, France
Björn Hoyheim
Affiliation:
Norwegian School of Veterinary Science, Ullevålsveien 72 Oslo, Norway
Dominique Ombredane
Affiliation:
UMR INRA-Agrocampus Rennes Ecobiologie et Qualité des Hydrosystèmes Continentaux, 65 rue de St Brieuc, 35042 Rennes Cedex, France
Jean-Luc Baglinière
Affiliation:
UMR INRA-Agrocampus Rennes Ecobiologie et Qualité des Hydrosystèmes Continentaux, 65 rue de St Brieuc, 35042 Rennes Cedex, France
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Abstract

The level of genetic differentiation between anadromous and non-andromous trout (Salmo trutta L.) coexisting in a Norman river (Oir river) was examined at 15 microsatellites markers. Despite a large amount of variation, no genetic differentiation was found between forms. Four domesticated stocks were also genotyped with the same loci. Highly significant differences were found with natural samples allowing to exclude a recent stocking effect on the Oir population. We conclude that the resident and anadromous trout form a single naturally reproducing unit in this river system. However, this conclusion could reflect particular ecological or demographic conditions in the Oir basin and needs to be validated in other hydrographical and ecological contexts.

Type
Research Article
Copyright
© EDP Sciences, IFREMER, IRD, 2005

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