Genetic differences in male development time among populations of the endangered Gila topminnow

Article Abstract:

The timing of male sexual maturity was compared in a common laboratory environment for populations from the four watersheds in which the Gila topminnow (Peociliopsis o. occidentalis) are still found in Arizona. The Monkey Spring population was observed to have about 50% later development of male sexual maturity. Monkey was the only population whose natural habitat has both constant and warm, year-round temperature and year-round production.

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A narrow hybrid zone between two Cottus species in Wills Creek, Potomac drainage

Article Abstract:

Research describing a hybrid zone between the mottled sculpin and Blue Ridge sculpin fish in a tributary of the Potomac is presented. In particular changes in allozymes, morphology and spawning coloration are investigated.

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MHC variation and tissue transplantation in fish

Article Abstract:

Research describing tissue rejection in the Gila topminnow fish is presented. In particular major histocompatibility complex genes from a class II locus are investigated.

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