A paper resulting from Anthony Geneva’s rotation in the Garrigan Lab just appeared in Genes.  Using coalescent simulations, Geneva and Garrigan “describe the conditions for, and extent of, the introgression of genetic material into the genome of a colonizing population from an endemic population.”  Their results show that our ability to diagnose reticulate evolution vary depending on a range of parameters, including population sizes, timing of secondary contact, and the duration of allopatry.  One result they highlight is the finding that introgression is much more difficult to detect close to the time of a severe founder event than it is after the range of the colonizing species has had time to increase.