| fitness differences among remnant populations of the endangered sonoran topminnow. | 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 fo ... | 2009 | 2772650 |