Caractérisation de la structure génétique de populations et évaluation de ses déterminismes environnementaux chez le grand brochet (Esox lucius) dans le système lac Ontario - fleuve Saint-Laurent

Authors: Ouellet-Cauchon, Geneviève
Advisor: Bernatchez, LouisMingelbier, Marc
Abstract: In this study, we documented the landscape genetics of northern pike (Esox lucius) based on the analysis of 22 microsatellites, comprising 10 markers developed for the purpose of this study, in the Lake Ontario – St. Lawrence River system. Population genetic structure over the whole study area was globally very weak but spatially variable with mean level of differentiation in the upstream (Ontario) section of the studied area being three-fold higher than observed in the downstream (Québec) sector. Twenty environmental variables were considered and different water masses, dams’ presence and inter-annual water level stability were positively associated to the extent of genetic differentiation. Since high water level variation impacts on yearly quality and localization of northern pike spawning habitats, local habitat instability which is under the form of inter-annual water level variation seems to locally impede population genetic structure, perhaps by inhibiting philopatry behavior. Keywords: Esox lucius, northern pike, landscape genetics, population genetic structure, environmental variation, habitat stability, microsatellite markers, management, conservation.
Document Type: Mémoire de maîtrise
Issue Date: 2013
Open Access Date: 20 April 2018
Grantor: Université Laval
Collection:Thèses et mémoires

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