an estimated 95 to 98 percent of the coral in the Keppel
Islands, part of Australia's Great Barrier Reef, is suffering from
a bleaching episode. basically, the algae that live in coral
and give coral its colors, are killed by hotter-than-usual
water temperatures. if the algae do not return within a
month or so, the corals themselves may begin to die.
Australia has just experienced its warmest year on record and
abnormally high sea temperatures during summer have caused massive
coral bleaching in the Keppels. Sea temperatures touched 84
Fahrenheit, the upper limit for coral. Source.

bleached coral in the great barrier reef
these bleaching episodes started in 1998, and have continued as the
average ocean temperatures continue to rise. the Caribbean has also
suffered bleaching, but not to the extent the Great Barrier Reef has.
will there be a time soon when the reefs off Bonaire, Grand Cayman,
and Roatan, will be void of coral?
i must admit it does not look good.
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3/21/2006 - Bleaching
Back in the 60's (?) Dr. John Wells used oxygen isotope studies to look at coral growth throughout geologic time. I wonder if this could be useful in such a study? Being a cold water kelp forest ecologist, I'm not teribly familiar with coral reef studies.