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Science 1 September 1989:
Vol. 245. no. 4921, pp. 976 - 978
DOI: 10.1126/science.2772650
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Articles

Science, Vol 245, Issue 4921, 976-978
Copyright © 1989 by American Association for the Advancement of Science

articles

Fitness differences among remnant populations of the endangered sonoran topminnow

JM Quattro and RC Vrijenhoek

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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