photos of healthy and bleached coral plus global bleaching threat map
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Microscopic algae inhabit coral polyps and give healthy corals, like these in the Virgin Islands (left), their vibrant colors. A prolonged temperature increase as small as 1°C can result in bleaching and possible death. The photo on the right shows a bleached elkhorn coral that has lost its distinctive colors.

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Microscopic algae inhabit coral polyps and give healthy corals, like these in the Virgin Islands (left), their vibrant colors. A prolonged temperature increase as small as 1°C can result in bleaching and possible death. The photo on the right shows a bleached elkhorn coral that has lost its distinctive colors.

Caption: 

Microscopic algae inhabit coral polyps and give healthy corals, like these in the Virgin Islands (left), their vibrant colors. A prolonged temperature increase as small as 1°C can result in bleaching and possible death. The photo on the right shows a bleached elkhorn coral that has lost its distinctive colors.

Photo Credit: 
NOAA