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Scientists at the Palau International Coral Reef Center estimate that it takes at least nine to 12 years for coral reefs to fully recover from mass bleaching events, according to research ...
An overall analysis of coral loss found that coral populations on the Great Barrier Reef had declined by 50.7% from 1985 to 2012, but with only about 10% of that decline attributable to bleaching, and the remaining 90% caused about equally by tropical cyclones and by predation by crown-of-thorns starfishes. [112]
The NOAA coral reef authority declared the global bleaching event in April 2024, making it the fourth of its kind since 1998. The previous record from the 2014 to 2017 mass bleaching affected just ...
Bleaching occurs when the zooxanthellae and coralline algae leave the coral skeleton behind due to stresses in the water. This causes the coral to lose its colour because the previous organisms sustained on the coral skeleton vacate, leaving a white skeleton. The bleached coral can no longer complete photosynthesis, and so it slowly dies.
Incidents of bleaching have become more frequent in recent decades, in correlation with a rise in sea surface temperatures. In July 2023, recordbreaking early and rapid warming resulted in widespread coral bleaching and death. [11] Rescue efforts, such as relocating corals to tanks or to deeper waters have helped some bleached corals recover.
The Great Barrier Reef's massive loss to coral bleaching last year might have been just a taste of things to come. According to a study by a team of marine scientists, 99 percent of the world's ...
The last global coral bleaching event happened in 2014 and lasted until 2017. More than 56% of global reef areas saw temperatures that could cause bleaching during that time period.
Coral bleaching in Oahu has been on the rise since 1996, when Hawaii's first major coral bleaching occurred in Kaneohe Bay, followed by major bleaching events in the Northwest islands in 2002 and 2004. [1] In 2014, biologists from the University of Queensland observed the first mass bleaching event, and attributed it to The Blob. [2]