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Dispersion et structure génétique d'une population de Rat des moissons (Micromys minutus PALLAS, 1771) soumise à des inondations régulières

Abstract : The effect of flooding on the genetic structure of small mammal populations and their dispersal remains unstudied. The Harvest mouse (Micromys minutus) is an interesting study model because several traits of its biology suggest that it should be well adapted to this type of disturbance. The purpose of this thesis is to identify the genetic structure of a population of Harvest mouse on a landscape scale, to determine the ability of animals to move and disperse, and to assess the effect of floods on their movements and on the genetic structure of populations. The study combines direct field approaches (CMR, radiotracking, camera traps) with inferences from genetic analyses on a large number of individuals, using nine new polymorphic microsatellites described for this species. The Harvest mouse forms a unique population at the landscape scale, with little isolation by distance due to large gene flows. Its dispersal abilities are rather high. During the floods, the Harvest mouse stays in the reedbed without any apparent leak movement. Floods have an effect on gene flows that is different, depending on the refuge possibilities provided by habitats. These outcomes show that the Harvest mouse seems to be a flood-friendly species. More generally, it should be considered as a wetland flagship species.
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https://tel.archives-ouvertes.fr/tel-02113276
Contributor : Fabrice Darinot <>
Submitted on : Sunday, April 28, 2019 - 2:42:52 PM
Last modification on : Friday, September 18, 2020 - 2:34:44 PM

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Fabrice Darinot. Dispersion et structure génétique d'une population de Rat des moissons (Micromys minutus PALLAS, 1771) soumise à des inondations régulières. Biodiversité et Ecologie. PSL research University, 2019. Français. ⟨tel-02113276⟩

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