Genetic data representing all six recognized species of a Neotropical avian genus, the Dendrocincla woodcreepers

We used thousands of genome-wide SNPs to infer phylogenetic relationships, calculate ages of splitting, and to estimate the timing of introgression in a widespread avian neotropical genus of woodcreepers. We uncovered historical introgression events among closely and distantly related lineages of Dendrocincla. We found an approximately exponential decline in the proportion of the genome introgressing with increasing time between divergence and introgression. These results are in agreement with a growing list of studies suggesting that reproductive isolation in Amazonian and other neotropical birds develops over an extended timeframe.