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Abstract
A defining feature of species is that their constituting populations are connected
by gene flow. However, interspecific gene flow (introgression) can affect species
integrity. If some genome components were less prone to introgression than others,
they should be particularly suitable to delimitate species. Recent simulation studies
have predicted a negative correlation between intra- and interspecific gene flow,
suggesting that markers associated with the most dispersing sex should better delimitate
species. A review of studies of introgression in species with sex-biased dispersal
largely confirms this prediction. Hence, species delimitation should be more effective
with markers experiencing high levels of gene flow, a simple but not widely appreciated
prediction.