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Corals beat heat by being prepared

Once waters begin to warm, a study finds, it's too late to adapt

Corals that can survive in warming ocean water may be genetically primed to sweat it out.

Studying reef-building Acropora hyacinthus corals from American Samoa’s Ofu Island, researchers from the Stanford University Hopkins Marine Station in Pacific Grove, Calif., found that the activity of hundreds of genes changed when both heat-sensitive and heat-tolerant corals were switched from 29.2° Celsius water to 32.9° C water. But even before getting into hot water, heat-tolerant corals had already turned on 60 genes designed to help combat heat and stress, the researchers report online January 7 in the Proceedings of the National Academy of Sciences.

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