Evolutionary changes of nonlinear reaction norms according to thermal adaptation: a comparison of two Drosophila species.

Abstract excerpt

While the adaptive significance of discontinuous reaction norms is generally accepted, the evolutionary interpretation of continuous response curves remains speculative, and the occurrence of internal constraints is often suggested as an explanation of experimental observations. In Drosophila melanogaster, various morphometrical traits exhibit convex reaction norms to growth temperature, with a maximum value...

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