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Biologie et génétique des populations d'une espèce invasive: le cas du vison d'amérique (Mustela vison Schreber, 1777) en bretagne

Abstract : Invasive species represent a major threat to biodiversity and are significant component of human-caused global environmental change. The rate of introduction of exotic species dramatically increases during the last decades. The American mink (Mustela vison) was introduced in Europe in the 1920s for the purpose of fur farming. Escapes from farms, or deliberately released animals, have lead to the establishment of feral populations in many areas, and represent a major threat to native fauna. The aim of this thesis was to understand the population dynamics of feral mink populations in Brittany, Western France, in order to draw better control strategies. Firstly, we investigated the population distribution and density, and demographic data to improve our understanding of the population functionment. We concluded than the mink population of Brittany was an invasive population. Then, we implement an experimental design to assess the impact of feral mink on native fauna. This study highlighted that the effects of alien predators could be difficult to measure in the short term. Finally, we investigated the genetic variability and population structure of feral and farmed mink from Brittany as well as mink from other European countries and from North America. A strong genetic structure and the presence of admixture areas were detected in Brittany. The insights of those results for the understanding of the population dynamics of feral American mink are discussed, as well as their consequences for control strategies
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  • HAL Id : tel-00346327, version 1

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Aline Bifolchi. Biologie et génétique des populations d'une espèce invasive: le cas du vison d'amérique (Mustela vison Schreber, 1777) en bretagne. Ecologie, Environnement. Université d'Angers, 2007. Français. ⟨tel-00346327⟩

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