Multilocus tests of Pleistocene refugia and ancient divergence in a pair of Atlantic Forest antbirds (Myrmeciza)

摘要: The Atlantic Forest (AF) harbours one of the most diverse vertebrate faunas world, including 199 endemic species birds. Understanding evolutionary processes behind such diversity has become focus many recent, primarily single locus, phylogeographic studies. These studies suggest that isolation in forest refugia may have been a major mechanism promoting diversification, although there is also support for role riverine and geotectonic barriers, two sets hypotheses can best be tested with multilocus data. Here we combined data (one mtDNA marker eight anonymous nuclear loci) from parapatric antbirds, Myrmeciza loricata M. squamosa, Approximate Bayesian Computation to determine whether explains current patterns genetic variation their status as independent units. Patterns population structure, differences intraspecific levels divergence coalescent estimates historical demography fit predictions recently proposed model refuge which climatic stability northern AF sustains higher demographic than southern AF. However, pre-Pleistocene associated abutting range limits region past tectonic activity suggests rivers or barriers. Little no gene flow between these development reproductive barriers competitive exclusion. Our results limited sampling recent compromise times demography, discuss effects on this other