Microscopic coral cilia malfunction under ocean warming, study finds

The short version

• Microscopic cilia beat rapidly to circulate oxygen-rich seawater to coral polyps at night and during stress, but warming water accelerates this motion until energy consumption outpaces oxygen delivery.[Wired]
• Laboratory research shows cilia beat faster as ocean temperatures rise, but they shut down entirely past critical heat limits, leading to coral suffocation.[Wired]
• Scientists consider ocean deoxygenation a major threat to marine reefs, alongside traditional concerns like bleaching and acidification.[Wired]
• Researchers are working to clarify the biological triggers driving faster ciliary motion in hotter water and its direct relation to bleaching.[Wired]

Key facts

• Coral cilia rapidly wave to create swirling water vortices, circulating oxygen and clearing sediment around the colony.[Wired]
• Rising ocean temperatures decrease oxygen availability while increasing coral energy demands, forcing cilia to beat faster.[Wired]
• If water becomes too hot, accelerated ciliary movement uses up available oxygen faster than polyps can absorb it, causing suffocation.[Wired]
• Research indicates that patchy bleaching patterns on coral reefs correspond with zones of reduced water flow and oxygen.[Wired]

Sources

Outlet counts describe coverage, not independent confirmation. Reports may share a wire service or original source.

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