We just published a new paper that uses comparative phylogeography to demonstrate that an ephemeral speciation model may underlie some of the complex patterns by which genetic diversity is structured among southern African birds. We used niche modeling and demographic modeling in combination with traditional Sanger sequenced genetic data for three species (the Acacia Pied Barbet, the Crimson-breasted Shrike, and the Chestnut-vented Warbler) to show that for each species there are multiple lineages that were most likely isolated in separate aridland refugia during the Plio-Pleistocene climatic fluctuations, but have since expanded and are now overlapping and merging.
Here is the full citation if you want to read more! G. Voelker, G. O. U. Wogan, J. W. Huntley, R. C. K. Bowie. 2021. Comparative phylogeography of southern African bird species suggests an ephemeral speciation model. Diversity 13:434 link DOI: 10.3390/d13090434