Hybridization and introgression during density-dependent range expansion: European wildcats as a case study

Evolution; International Journal of Organic Evolution
Claudio S QuilodránMathias Currat

Abstract

Interbreeding between historically allopatric species with incomplete reproductive barriers may result when species expand their range. The genetic consequences of such hybridization depend critically on the dynamics of the range expansion. Hybridization models during range expansion have been developed but assume dispersal to be independent from neighboring population densities. However, organisms may disperse because they are attracted by conspecifics or because they prefer depopulated areas. Here, through spatially explicit simulations, we assess the effect of various density-dependent dispersal modes on the introgression between two species. We find huge introgression from the local species into the invasive one with all dispersal modes investigated, even when the hybridization rate is relatively low. This represents a general expectation for neutral genes even if the dispersal modes differ in colonization times and amount of introgression. Invasive individuals attracted by conspecifics need more time to colonize the whole area and are more introgressed by local genes, whereas the opposite is found for solitary individuals. We applied our approach to a recent expansion of European wildcats in the Jura Mountains and the hybr...Continue Reading

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Citations

Jul 23, 2020·Communications Biology·Claudio S QuilodránMathias Currat
Sep 11, 2020·Evolutionary Applications·Claudio S QuilodránMathias Currat
Nov 24, 2021·Conservation Biology : the Journal of the Society for Conservation Biology·William J SmithSonya M Clegg

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Methods Mentioned

BETA
GAM

Software Mentioned

R
R Development Core Team
SPLATCHE2

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