Effect of habitat fragmentation on genetic introgression

Diplôme Master Effect of habitat fragmentation on genetic introgression eng 2025-05-27 2025-05-27 author Lopes Gonçalves Filipe 904683 director Currat Mathias 0000-0001-5211-8922 89701 Département de génétique et évolution (Genev) (BIANI) director Quilodran Claudio 0000-0001-7197-9154 753257 Département de génétique et évolution (Genev) (BIANI) 64 <p>Habitat fragmentation, the process by which continuous habitats are broken into smaller, isolated patches, can alter gene flow between species and thereby influence their hybridization and the resulting exchange of genetic material through introgression. This study used spatially explicit simulations to assess how different configurations of habitat fragmentation affect the extent and spatial distribution of introgression between two interacting species. We tested five scenarios varying in carrying capacity, duration of hybridization, expansion dynamics and species spatial overlap. In all scenarios where both species coexist over the full landscape, fragmentation alone has no consistent effect on mean introgression and its spatial variance. However, when contact was restricted to discrete zones, the length of contact areas and the intensity of local hybridization has a clear influence on introgression levels. These results suggest that fragmentation impacts introgression primarily through its effect on the spatial structure of species interactions. This highlights the importance of incorporating spatial dynamics into conservation strategies, particularly in hybrid zones within fragmented habitats.</p> Population genetics Spatially explicit simulation Introgression Hybridization Habitat fragmentation Dewey 590 Bi-disciplinary Master, major Biology, minor Mathematics 44 Département de génétique et évolution 162 false 682 Laboratory of Anthropology, Genetics and Peopling history (AGP) 828 Groupe Currat f65349aa-cea6-4bf7-8911-23ab95ed2401 Master thesis Restricted FilipeLopesGoncalves_Master_final_2.pdf 4938754 application/pdf 060e0ddb42ec0f7dee54fa67d30bdd40e67987494d4b4c183fddfdbf10757c42 restrictedAccess Faculté des sciences / Section de biologie / Département de génétique et évolution

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Lopes Gonçalves, Filipe

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