Species pairs that disappear through hybridization after human-induced changes to the environment can reemerge if the disturbance is removed, according to a new mathematical model that shows the conditions under which reemergence might happen.
The reemergence of species pairs is more likely when the disturbances were strong than when they were weak, and most likely when disturbances were quickly corrected. However, even temporary bouts of hybridization often led to substantial homogenization of species pairs. This suggests that ecosystem managers may be able to refill ecological niches, but probably won't be able to resurrect lost species after species collapse.
Ref: Hybridization, species collapse, and species reemergence after disturbance to premating mechanisms of reproductive isolation. Evolution. R.T. Gilman and J.E. Behm, published online April 29.