Contrasting mechanisms for using humidity as cue for seasonal polyphenism in two tropical butterflies.

Abstract excerpt

Many tropical butterflies exhibit seasonal wing pattern plasticity, producing cryptic dry-season morphs with small or no ventral eyespots and conspicuous wet-season morphs with large wing-marginal eyespots that deflect predator attacks away from vital body parts. Eyespot size is influenced by temperature during larval development. However, many tropical regions lack a predictable temperature-rainfall correlation,...

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