Coral Reefs

Corals are tiny animals that live in large communities made up of individual polyps that secrete a calcium carbonate substance that hardens and builds up to form the reef structure over time. There are different types of corals, such as brain corals and fan corals, that form different types of structures. The coral polyps live symbiotically with algae that provides them with their food. Disease, temperature extremes and pollution can cause corals to expel the algae, leaving only the white calcium carbonate skeleton behind, an event called coral bleaching. Coral bleaching is a worry with global warming heating up the oceans and carbon dioxide causing the oceans to acidify. Coral reefs are important ecosystems because they support larger communities of fish, mollusks, crustaceans and other sea creatures.
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Hot Oceans Are Killing Coral Reefs Around the World
Bleached coral can be seen at Lisianski Island in Papahanaumokuakea Marine National Monument, in Hawaii, as documented during a NOAA mission in August 2014.
October 8th, 2015
For only the third time on record, coral bleaching is occurring across the globe and climate change is to blame.
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Red Sea's Glowing Corals are Rainbow of Colors
June 26th, 2015
Deep in the Red Sea, beyond the reach of most scuba divers, coral reefs are putting on a glowing, colorful show, scientists have discovered.
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From a Childhood Fascination with Fish to a Career in Conservation
Colorful fish in basket
August 13th, 2015
Coral reefs are key to wildlife, and human, survival — and they may yet be saved.
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Balancing the Good and Bad: News for Coral Reefs
reefs cape in the Philippines
January 25th, 2015
Marine ecologist Paul Sikkel discusses his passion for and work with coral reefs and the best ways to protect them.
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Experts: Great Barrier Reef's Biggest Threat is Coal
A great butterfly fish, global warming
October 27th, 2014
Reef historian Iain McCalman, in Sydney, and reef scientist Stephen Palumbi, in California, are monitoring reef degradation from opposite sides of the planet. They compared notes.
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Beautiful Corals in Home Aquariums Can Poison You
A zoanthid coral
August 13th, 2015
Aquarium enthusiasts and people who work in aquarium stores should be aware that some types of coral produce dangerous toxins.
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Coral Pyramids in Micronesia Date Back to Middle Ages
Bat tomb corals
March 13th, 2015
New evidence reveals that the ancient coral tombs of Leluh in Micronesia could be up to 700 years old — much older than previously thought.
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