Fritz, Eugene Samuel.2014-10-2119731973AAINK18607http://hdl.handle.net/10222/55010Thesis (Ph.D.)--Dalhousie University (Canada), 1973.Biology, General.Hybridization and isolating mechanisms between sympatric populations of Fundulus heteroclitus and Fundulus diaphanus (Pisces : Cyprinodontidae).text