Adaptabilidad del poccilido de gila en peligro

Ruby J. Sheffer, Philip W. Hedrick, W. L. Minckley, Anthony L. Velasco

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

The Gila topminnow (Poeciliopsis o. occidentalis) is a small, live-bearing, endangered fish extant in a maximum of nine locales in four separate watersheds in the United States. To determine if these populations differed in their fitness, we obtained samples from the four watersheds and examined them for four fitness correlates survival, growth rate, fecundity, and bilateral asymmetry. Earlier research found that one population, Sharp Spring, had higher allozyme heterozygosity than the other three and had higher survival, growth rate, and fecundity and lower bilateral asymmetry than a sample from one of the other populations with no polymorphic allozyme loci, Monkey Spring. We also verified that Sharp Spring fish were polymorphic for the same allozyme loci whereas the Monkey Spring population was not. We did not, however, find positive associations of allozyme heterozygosity with the four fitness correlates for the four samples. Because the earlier study had much lower survival, it is likely that the differences resulted from differential response of the two populations to a stressful laboratory environment. Whether this unknown stress occurs in natural environments or its effect is predictive of other stresses remains unresolved. As a result, we concur with suggestions in the draft recovery plan that topminnows from nearby sources by used for reintroductions and that the Sharp Spring stock not be used outside the upper Santa Cruz River drainage.

Original languageEnglish (US)
Pages (from-to)162-171
Number of pages10
JournalConservation Biology
Volume11
Issue number1
DOIs
StatePublished - Feb 1 1997

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Nature and Landscape Conservation

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