Further genetic analyses of a hybrid zone between leopard frogs ( Rana pipiens complex) in central Texas.

Abstract

The zone appears to be stable in position. Major year-to-year changes in allele frequencies do not show concordant patterns between localities, probably the result of local stochastic factors. Analysis of a single cohort during 3 months that included both the larval and post-metamorphic stages shows a strong shift in genotypes. The froglet population had more animals with parental genotypes and fewer hybrid combinations, probably a result of differential mortality due to developmental incompatibilities when hybrids begin to metamorphose. -from Authors