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Light plays many roles in the lives of organisms other than that which we normally associate with the visual perception of patterns in the environment. Therefore, it is useful to distinguish between those situations in which (1) light is important to organisms primarily because of its energy content, and (2) light functions as a signal, stimulus, or “trigger” and, from a biological viewpoint, energetic considerations are secondary.
KeywordsCircadian Rhythm Circadian Clock Light Cycle House Sparrow Constant Light
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