Investigating Origin of Circatidal Rhythms In Freshwater Snails

Snails synchronize rhythms with tides, revealing adaptability to environmental changes

Organisms, including humans, follow a schedule that coordinates important bodily functions such as sleep-wake cycles, metabolism, hormone production, cognitive function, and feeding habits to environmental cycles. While most organisms possess circadian rhythms synchronized with the 24-hour day-night cycle, they have also developed other internal clocks to suit their local environments. Marine animals have evolved circatidal rhythms, aligning activities with the 12.4-hour tidal cycle, complementing circadian rhythms. Researchers from Chiba University have discovered that snails living in downstream tidal areas have biological rhythms synchronized with the tidal cycles, unlike those in nontidal regions. This observation raises the question of whether circatidal rhythms develop due to differences in habitat or are caused by genetic variations between the populations. 

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