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Marine heatwaves are emerging as a key impact of climate change and pose a particularly significant threat to corals that form the backbone of coral reefs. Researchers have now identified a phenomenon that could help coral reef managers better plan and act for the future.

As remote as they were beautiful, the coral reefs around the 5 volcano tips making up the Southern Line Islands dazzled National Geographic explorers in 2009 during a visit. Remarking that they re-painted the image of what a pristine coral reef looks like—bursting with color and life—the team of