Posterior probability distributions of the six parameters estimated using the isolation-migration model. Left panel is current (pied flycatcher = blue, collared flycatcher = red) and ancestral (green) effective population size estimates in millions, middle panel is time of divergence in million years and right panel is post-divergence migration rates (per gene per generation) from pied flycatcher to collared flycatcher (red) and from collared flycatcher to pied flycatcher (blue). A) allopatric Spanish pied flycatcher and Italian collared flycatcher, B) allopatric Spanish pied flycatcher and Hungarian collared flycatcher, C) sympatric pied flycatcher and collared flycatcher from the Baltic Sea islands and D) between species comparison including data from all populations within each species.
Backström et al. BMC Evolutionary Biology 2013 13:2 doi:10.1186/1471-2148-13-2