Directional gene flow patterns in disjunct populations of the black ratsnake (Pantheropis obsoletus) and the Blanding’s turtle (Emydoidea blandingii) - Briar J. Howes; Joseph W. Brown; H. Lisle Gibbs; Tom B. Herman; Stephen W. Mockford; Kent A. Prior; Patrick J. Weatherhead (Conservation Genetics, 2009)