NOAA

Aug 27, 2015

Corals become stressed when water temperatures at reef sites rise only 1 degree Celsius warmer than the highest temperature expected in the summertime (the "bleaching threshold"). If these warm temperatures persist, corals may experience what is called bleaching — when they expel their symbiotic algae under the stress and become pale-colored and malnourished. If bleaching continues for extended periods of time, coral may die.

Satellite data provide reliable information on the heat stress that leads to coral bleaching. T...

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