limited to Africa and was at high local frequency (82%), which is
indicative of post-divergence introgression because the ILS scenario
does not necessarily predict such a skewed geographic distribution.
Third, the likelihood ratio test supported a post-divergence
gene flow scenario with statistical significance. While the ND5
genealogy suggests that post-divergence gene flow occurred from
M. birostris into M. alfredi in the past, most likely via uni-directional
hybridization, extant hybridization is not consistent with reciprocal
monophyly in RAG1 and divergent species morphology. One
of plausible mechanisms for unidirectional hybridization in animals
is a major decline in population in the past, where allospecific
males were accepted by females of the rarer species (Wirtz, 1999).
limited to Africa and was at high local frequency (82%), which is
indicative of post-divergence introgression because the ILS scenario
does not necessarily predict such a skewed geographic distribution.
Third, the likelihood ratio test supported a post-divergence
gene flow scenario with statistical significance. While the ND5
genealogy suggests that post-divergence gene flow occurred from
M. birostris into M. alfredi in the past, most likely via uni-directional
hybridization, extant hybridization is not consistent with reciprocal
monophyly in RAG1 and divergent species morphology. One
of plausible mechanisms for unidirectional hybridization in animals
is a major decline in population in the past, where allospecific
males were accepted by females of the rarer species (Wirtz, 1999).
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