| genetic divergence and speciation in lowland and montane peruvian poison frogs. | amazonia is famous for high biodiversity, and the highlands of the transition zone between the andes and the lowlands of the amazon basin show particularly high species diversity. hypotheses proposed to explain the high levels of diversity in the highlands include repeated parapatric speciation across ecological gradients spanning the transition zone, repeated allopatric speciation across geographic barriers between the highlands and lowlands, divergence across geographic barriers within the tra ... | 2006 | 16815043 |