This is a preview. Log in through your library . Abstract Genetic variability was examined in two endemic cichlid fishes from Cuatro Cienegas, Coahuila, Mexico, and in Cichlasoma cyanoguttatum from ...

Species originate frequently by natural selection. A general mechanism by which this occurs is ecological speciation, defined as the evolution of reproductive isolation between populations as a result ...

Corrales, a recent biological sciences Ph.D. graduate from the University of Rhode Island, and his advisor, Associate ...

Covert and overt variation, as exemplified by British mouse populations / R.T. Berry -- The nature and significance of variation in wild populations / Kenneth Mather -- The extent of biochemical ...