A key part of the ecological theory of adaptive radiation is disruptive selection during periods of sympatry. Some insight into this process might be gained by studying populations that are bimodal ...

(1) The males of Papilio dardanus are monomorphic, tailed, and non-mimetic. In most of Africa the females are polymorphic, tailless, and unlike the males in appearance. Moreover, most of the female ...

That fashion tip works—in male lazuli buntings—because their blue plumage shows signs of a rarely documented evolutionary pattern called disruptive selection, contend Erick Greene of the University of ...