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Echantillonnage individu-centré en génétique du paysage : étude de l'impact de la fragmentation d'origine anthropique sur la dispersion du triton alpestre Ichthyosaura alpestris

Abstract : Anthropogenic activitites lead to profound landscape alterations : dispersal success thus holds a paramount importance for long-term persistence of populations. Landscape genetics is a recent discipline aiming to detect and describe dispersal patterns through indirect estimations of gene flow. Although the use of an individual-based sampling scheme has been proposed for a ;ong time to get round the issue of an a priori delimitation of population boundaries, most landscape gentic studies are still based on a population-based sampling scheme. results from simulations showed that decreasing the sampling coverage on individuals within populations in favour of a better sampling coverage of aggregates through space allowed a better detection of the impacts of landscape on gene flow, whatever the individual dispersal behaviour or the landscape configuration. when considering the dispersal patterns in the alpine newt Ichthyosaura alpestris, both in the vicinity of large transport infrastructures (Isolation-by-barrier IBB) and in agricultural landscape (Isolation-by-landscape-resistance IBR), the individual-based sampling scheme proved to be a flexible and efficient methodological alternative to the more conventional population-based sampling scheme.
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Submitted on : Wednesday, February 5, 2014 - 3:17:12 PM
Last modification on : Friday, September 30, 2022 - 11:12:08 AM
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  • HAL Id : tel-00942287, version 1
  • PRODINRA : 314663

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Jérôme Prunier. Echantillonnage individu-centré en génétique du paysage : étude de l'impact de la fragmentation d'origine anthropique sur la dispersion du triton alpestre Ichthyosaura alpestris. Sciences agricoles. Université Claude Bernard - Lyon I, 2012. Français. ⟨NNT : 2012LYO10263⟩. ⟨tel-00942287⟩

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