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How does dormancy help plants and animals survive drought?
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Dormancy
Virginia big-eared bats (Corynorhinus townsendii virginianushibernating) are true hibernators, entering a state close to death for much of the winter.
Dormancy is an adaptive mechanism that allows plants and animals to survive environmental stresses, such as drought, by entering a state of significantly reduced metabolic activity. By lowering their metabolism, organisms conserve energy and minimize their demands on the environment, allowing them to endure periods when essential resources like water are scarce.123
During drought, this state provides several survival advantages:
- Energy Conservation: By reducing metabolic rates, organisms can survive for extended periods without food or water, relying instead on stored reserves. For example, some reptiles during dry seasons utilize water produced through the metabolism of stored fat reserves.14
- Life Cycle Protection: Dormancy allows organisms to bypass critical, unfavorable environmental stages. When habitats like ponds or lakes dry up, aquatic organisms capable of dormancy can survive, whereas others perish.2
- Behavioral Refuge: Many organisms seek out specific niches—such as burrowing into soil or hiding under protective objects—where they remain in a state of developmental or physiological standstill until favorable conditions return.45
- Adaptive Timing: In some species, dormancy is triggered by environmental cues and persists until specific stimuli, such as the arrival of seasonal rains, signal that conditions are once again suitable for normal activity.35