The Hidden Side of Invasions: Massive Introgression by Local Genes

摘要: Despite hundreds of reports involving both plants and animals, the mechanisms underlying introgression remain obscure, even if some form selection is frequently invoked. Introgression has repeatedly been reported in species that have recently colonized a new habitat, suggesting demographic processes should be given more attention for understanding introgression. Here we show by spatially explicit simulations massive neutral genes takes place during invasion an occupied territory interbreeding not severely prevented between invading local species. We also demonstrate occurs almost exclusively from to species, especially populations located far away source invasion, this irrespective relative densities two This pattern strongest at markers experiencing reduced gene flow, keeping with observation organelle are often preferentially introgressed across boundaries. A survey literature shows majority published empirical studies range expansions, animals plants, follow predictions our model. Our results imply speciation can identified comparing genomes interfertile native pairs.