Masking in Invertebrates

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Abstract
Masking effects are a common feature of daily rhythmicity in invertebrates; and, particularly with respect to activity/rest cycles in arthropods and mollusks, there are numerous examples of masking in response to external environmental stimuli. Internal masking, in which endogenous processes modulate circadian patterns, has also been documented in a few species. In general, however, because of the absence of appropriate experimental investigations on masking, the functional significance (in an ecological sense) of masking effects is not understood.