Fluctuation in the photoperiod stimulates seasonal behavior in both plants and animals.

Question

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Fluctuation in photoperiod, the duration of daylight and darkness, is a key environmental cue that triggers seasonal behaviors in many plant and animal species. For example, decreasing daylight hours in the fall triggers changes in hormone levels that cause leaves to change color and fall off trees, and also triggers reproductive behaviors in many animals. In contrast, increasing daylight hours in the spring triggers behaviors like sprouting and blooming in plants, and mating and nesting in animals.

Fluctuation in the Photoperiod Stimulates Seasonal Behavior in Both Plants