A Review of the 2014-2017 Global Coral Bleaching Event
In 2014, NOAA Coral Reef Watch wrote about the prospect for a 2014-2015 El Niņo which, while not fully formed, helped start a three-year global coral bleaching event. The 2014-2017 global coral bleaching event was the third ever documented and is currently on record as the longest, most widespread, and most damaging bleaching event. It affected more coral reefs than any previous global bleaching event. In some coral reef areas, including reefs that had never bleached before, heat stress was the highest ever recorded, lasted for many months, and caused mass bleaching reef-wide.
Coral bleaching is a stress response to events such as changing ocean temperatures, pollution, and overexposure to sunlight. Corals expel their algae, called zooxanthellae, leading to the white color associated with bleaching. Bleached coral are not dead and can regain zooxanthellae if the stressor is reduced quickly. However, bleached coral are more vulnerable to additional stress and death.
Learn more about the 2014-2017 global bleaching event, and NOAA Coral Reef Watch's work to predict, remotely monitor in near real-time, document, and communicate with stakeholders about this devastating event, in the following story map: A Review of the 2014-2017 Global Coral Bleaching Event.
Appearing as solitary forms in the fossil record more than 400 million years ago, corals are extremely ancient animals that evolved into modern reef-building forms over the last 25 million years. Continue Reading →
coral reef conservation program
The NOAA Coral Reef Conservation Program (CRCP) is a partnership between the NOAA Line Offices that work on coral reef issues: the National Ocean Service, the National Marine Fisheries Service, the Office of Oceanic and Atmospheric Research, and the National Environmental Satellite, Data and Information Service. The CRCP brings together expertise from across NOAA for a multidisciplinary approach to managing and understanding coral reef ecosystems.
Contact CRCP →
NOAA's Coral Reef Conservation Program
SSMC4, 10th Floor
1305 East West Highway
Silver Spring, MD 20910
CoRIS: Thank you for visiting NOAA's Coral Reef Information System. Take our website user survey. We welcome your ideas, comments, concerns and suggestions.
NOAA's Coral Reef Information System
SSMC3, 4th floor
1315 East-West Hwy
Silver Spring, MD 20910 email@example.com