Question

Short note on Bleaching of coral reefs

Answer 1

Answer:

Coral bleaching occurs when coral polyps expel algae that live inside their tissues. Normally, coral polyps live in an endosymbiotic relationship with these algae, which are crucial for the health of the coral and the reef.[1] The algae provides up to 90 percent of the coral's energy. Bleached corals continue to live but begin to starve after bleaching.[2] Some corals recover.

The leading cause of coral bleaching is rising water temperatures.[3] Temperatures 2 degrees Fahrenheit (1 degree Celsius) above average can cause bleaching.[3] According to the United Nations Environment Programme, between 2014 and 2016 the longest recorded global bleaching events killed coral on an unprecedented scale. In 2016, bleaching of coral on the Great Barrier Reef killed between 29 and 50 percent of the reef's coral.[4][5][6] In 2017, the bleaching extended into the central region of the reef.[7][8] The average interval between bleaching events has halved between 1980 and 2016.[9]

Answer 2

Explanation:

When water is too warm, corals will expel the algae (zooxanthellae) living in their tissues causing the coral to turn completely white. This is called coral bleaching. ... In 2005, the U.S. lost half of its coral reefs in the Caribbean in one year due to a massive bleaching event......