## Additional File 2.
θand _{1}, θ_{2 }θ, are the mean population rates for the Old World, the New World and the ancestral
population, respectively; t is the mean time of divergence of populations from a common
ancestor; m_{A}_{1 }represents the mean number of migrations into the Old World and m_{2 }is the mean number of migrations into the New World. Numbers in parenthesis are standard
deviations. Reliable estimation of the highest probability density (HPD) intervals
could not be achieved, as the posterior distribution turned out to be incomplete in
several cases. All values represent arithmetic means taken from 15 independent runs
per species.
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