Pnina's paper was published in BMC Evolutionary Biology!
This is a demographic history study that developed from our collaboration with DeWayne Shoemaker. Pnina used a large dataset of RADseq from 300 population samples from two species of Solenopsis fire ants, from both their native and introduced ranges. The most valuable result is in dating the speciation of the two species, and showing that they did not have any substantial gene flow between them in South America in the past two million generations. This is in contrast to the extensive hybridization between them in the introduced range in the USA.