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Bimodal circatidal rhythms were induced in freshly caught specimens of the shore crab Carcinus maenas (L.) by ~ntroduction into dilute seawater at the time of 'expected' low water. In subsequent constant conditions, some individuals displayed 2 peaks in each tidal wavelength which were phased to either 'expected' high water or at approximately 12.5 h intervals after introduction. In a number of these crabs, the 2 series of peaks exhibited s~gn~ficantly different periods. These findings confirm the proposition that C. maenas has at least 2 functionally independent circatidal oscillators. These oscillators are differentiated by entraining influence, not by function, in contrast to multiple circadian rhythms.

Different free-running periods in split components of the circatidal rhythm in the shore crab Carcinus maenas