Extreme water temperatures in the Florida Keys kill nursery and wild coral

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Sea temperatures across the Florida reef tract reached record levels in July 2023, with a widely reported reading above 38 degrees Celsius at a shallow, semi-enclosed site in Florida Bay — a reading from a bay rather than from open reef, and not representative of reef conditions, though open-reef temperatures were themselves the highest on record for the tract. Restoration organisations moved nursery stock into land-based tanks; large numbers of outplanted and nursery staghorn and elkhorn colonies died. The summer is the clearest demonstration available that restoration does not confer thermal tolerance.

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