Melanin coloration has temperature-dependent effects on breeding performance that may maintain phenotypic variation in a passerine bird.

Abstract excerpt

Fluctuating selection pressure may maintain phenotypic variation because of different types of individuals being adapted to different environmental conditions. We show that the extensive variation in the coloration of male pied flycatchers (Ficedula hypoleuca) can be maintained through differences in the reproductive success of male phenotypes under different conditions. The effects of weather conditions on the...

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