The Pleistocene species pump past its prime: Evidence from European butterfly sister species

The Pleistocene glacial cycles had a profound impact on the ranges and genetic make‐up of organisms. While it is clear that the contact zones that have been described for many sister taxa are secondary and have formed in the current interglacial, it is unclear when the taxa involved began to diverge. Previous estimates based on small numbers of loci are unreliable given the stochasticity of genetic drift and the contrasting effects of incomplete...