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circalunar rhythm

Source:
A Dictionary of Biology
Author(s):
Elizabeth MartinElizabeth Martin, Robert HineRobert Hine

circalunar rhythm 

A biorhythm that corresponds with the lunar cycle (approximately 29.5 days). The reproductive cycles of many organisms, especially marine organisms, are linked to changing levels of moonlight and the tidal cycle, both of which are governed by the phases of the moon. See ultradian rhythm.