Contrasts of UCE-based genomic estimates of divergence and demographic processes in co-distributed high-latitude taxa having divergence levels from populations to full species show that gene flow is a predominant factor in avian speciation in this region. In addition, these taxa are discontinuously distributed on the speciation continuum, showing two clusters in a divergence space defined by FST and gene flow.

McLaughlin, J. F., B. C. Faircloth, T. C. Glenn, and K. Winker. 2020. Divergence, gene flow, and speciation in eight lineages of trans-Beringian birds. Molecular Ecology 29: 3526-3542. https://doi.org/10.1111/mec.15574 .