A before and after image of the bleaching in American Samoa. The first image was taken in December 2014. The second image was taken in February 2015 when the XL Catlin Seaview Survey responded to a NOAA coral bleaching alert. (Credit: XL Catlin Seaview Survey)

How algae disappear from corals during a bleaching event

by Tamaki Bieri Coral bleaching in the news Currently, the third massive worldwide coral reef bleaching event is unfolding. ┬áCorals from Hawaii to the Indian Ocean are affected, and recently, the worst bleaching ever witnessed in the Great Barrier Reef was reported. Once rare, coral bleaching events have increased both in frequency and severity over…