Science

Deep-sea mussels trade tidal rhythms for a 24-hour cycle in the lab

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 02/11/2026, 22:55:25 UTC.

Briefings

A laboratory study reveals that Bathymodiolus azoricus mussels, typically found at 1,700 meters depth, exhibit a 24-hour circadian rhythm in controlled conditions. This finding suggests that while the organism's natural environment is dark, its internal biological clock operates on a standard daily cycle, potentially influencing its survival strategies in the wild.

Key points

• Bathymodiolus azoricus mussels live at 1,700 meters (5,600 feet) depth in perpetual darkness.
• In the laboratory, these mussels follow a 24-hour circadian rhythm.

Context

Hydrothermal vents are deep-sea ecosystems where sunlight cannot penetrate, yet specialized organisms like Bathymodiolus azoricus thrive. This study investigates whether their internal biological clocks are adapted to the dark environment or if they maintain a standard daily cycle.

Limitations

The evidence is limited to a laboratory setting; field data on natural rhythms in the wild is unavailable. The study does not confirm if this 24-hour cycle is a survival adaptation or a laboratory artifact.

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