Evaluation of pre- and post-zygotic mating barriers, hybrid fitness and phylogenetic relationship between Cyprinodon variegatus variegatus and Cyprinodon variegatus hubbsi (Cyprinodontiformes, Teleostei).

Abstract excerpt

The euryhaline fish Cyprinodon variegatus variegatus (Cvv) is capable of tolerating ambient salinities ranging from 0.3 to 167 g l(-1) , but incapable of long-term survival in freshwater (< 2 mM Na(+) ). However, a population of this species, now designated as a subspecies (Cyprinodon variegatus hubbsi; Cvh), has been isolated in several freshwater (0.4-1 mM Na(+) ) lakes in central Florida for the past ~150 ky....

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