Spontaneously Induced Rhythm of Tidal Periodicity in Laboratory-Reared Carcinus

Abstract
1. Laboratory-reared shore crabs show circadian rhythmicity which is transformed to approximate tidal rhythmicity after a period of chilling to 4°C. 2. Periodogram analysis of the results characterizes the periodicity of the two types of rhythm, which suggest that the ability to show a rhythm of tidal periodicity is an inherited feature of shore-crab physiology.

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