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Science. 1989 Sep 1;245(4921):976-8.

Fitness differences among remnant populations of the endangered sonoran topminnow.

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Center for Theoretical and Applied Genetics, Cook College, Rutgers University, New Brunswick, NJ 08903.


Four correlates of fitness were measured in three stocks of the endangered Sonoran topminnow, Poeciliopsis occidentalis, from Arizona. Survival, growth, early fecundity, and developmental stability were greatest in laboratory-reared fish from the most heterozygous natural population studied. Conversely, all four traits were poorest in fish from a population with no electrophoretically detectable genetic variation. These results emphasize the need for genetic as well as demographic information for the development of comprehensive species recovery programs.

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