Coral Community (IMAGE) University of Melbourne Caption This is a coral community undergoing major bleaching on the northern Great Barrier Reef. In 2016, the Great Barrier Reef has undergone the third and most severe mass coral bleaching event. Researchers have discovered genetic markers in a reef-building coral that can provide information on how well a colony can tolerate such stress. Credit Neal Cantin, Australian Institute of Marine Science Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.