Diapause
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<speciesfyi-glossary slug="diapause"></speciesfyi-glossary>Definition
A period of suspended development in insects triggered by environmental conditions, allowing survival through unfavorable seasons.
Detailed Explanation
Diapause can occur at any life stage (egg, larva, pupa, or adult) and is typically triggered by photoperiod — day length reliably predicts approaching winter. It differs from quiescence (a direct response to cold) in that diapause is programmed in advance. Monarch butterfly diapause involves a remarkable interaction between photoperiod, temperature, and reproductive dormancy that coordinates millions of individuals' migration timing across North America.