photoperiodism /pho·to·pe·ri·od·ism/ (fo″to-pēr´e-ah-dizm) the physiologic and behavioral reactions brought about in organisms by changes in the duration of daylight and darkness.
pho·to·pe·ri·od·ism (f  t-pîr  - -d zm) or pho·to·pe·ri·o·dic·i·ty (-pîr--ds-t)n. The response of an organism to changes in its photoperiod, especially as indicated by vital processes. |
photoperiodism
the physiological and behavioral reactions brought about in organisms by changes in the duration of daylight and darkness, e.g. in reproductive activity, shedding of hair. Birds respond to longer daylight hours by increased sexual activity. Use is made of the phenomenon by using artificial light to stimulate egg production.
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