Phenotypic similarity and the evolutionary significance of countergradient variation.

  title={Phenotypic similarity and the evolutionary significance of countergradient variation.},
  author={David O. Conover and Eric T. Schultz},
  journal={Trends in ecology & evolution},
  volume={10 6},
Countergradient variation is a geographical pattern of genotypes (with respect to environments) in which genetic influences on a trait oppose environmental influences, thereby minimizing phenotypic change along the gradient. Phenotypic similarity across changing environments ought to be of intense interest because it belies considerable genotypic change. When it occurs in characters that are positively associated with fitness, countergradient variation conflicts with the hypothesis that local… CONTINUE READING
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