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Why do organisms enter dormancy during environmental stress?

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The image shows a group of Virginia big-eared bats sleeping upside down in a dark cavern. — Dormancy Virginia big-eared bats (*Corynorhinus townsendii virginianushibernating*) are true hibernators, entering a state close to death for much of the winter.

Organisms enter dormancy as an adaptive mechanism to survive periods of environmental stress, such as extreme temperatures, drought, or food scarcity. By entering a state of reduced metabolic activity, an organism conserves its available energy and minimizes its demands on the environment, allowing it to endure conditions that would otherwise be lethal.123

This state is often triggered by environmental variables like changes in temperature, photoperiod, or the availability of essential resources like water, food, and oxygen. Evolutionarily, dormancy allows organisms to pass through critical stages of their life cycle with minimal impact, enabling them to inhabit regions or niches that would be untenable for non-dormant species. Furthermore, dormancy can provide a competitive advantage by allowing organisms to avoid competition during their periods of activity. While often a response to external cues, some organisms maintain these cycles as innate behavioral patterns even when environmental stressors are removed.32