In what types of water do corals live? - NOAA's National Ocean Service
网页2024年6月16日 · Many grow optimally in water temperatures between 73° and 84° Fahrenheit (23°–29°Celsius), but some can tolerate temperatures as high as 104° Fahrenheit (40° Celsius) for short periods. Most reef-building corals also require very saline water ranging from 32 to 42 parts per thousand.
Coral reef | Description, Geochemistry, Origins, & Threats
网页2024年9月24日 · coral reef, ridge or hummock formed in shallow ocean areas by algae and the calcareous skeletons of certain coelenterates, of which coral polyps are the most important. A coral reef may grow into a permanent coral island. Often called the “rainforests of the sea,” coral reefs are home to a spectacular variety of organisms. Structure
Coral Reefs - National Geographic Society
网页2024年7月18日 · Coral reefs are important ocean habitats and offer a compelling case of the risks of climate change. Reefs provide a large fraction of Earth’s biodiversity —they have been called “the rainforests of the seas.”. Scientists estimate that 25 percent of all marine species live in and around coral reefs, making them one of the most diverse ...
Coral Reefs and Corals - Smithsonian Ocean
网页Reefs form when corals grow in shallow water close to the shore of continents or smaller islands. The majority of coral reefs are called fringe reefs because they fringe the coastline of a nearby landmass. But when a coral reef grows around a volcanic island something interesting occurs.
Coral reef - Wikipedia
网页A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. [1] . Most coral reefs are built from stony corals, whose polyps cluster in groups.
Coral reef ecosystems - National Oceanic and Atmospheric Administration
网页2019年2月1日 · Coral characteristics. Shallow water, reef-building corals have a symbiotic relationship with photosynthetic algae called zooxanthellae, which live in their tissues. The coral provides a protected environment and the compounds zooxanthellae need for …
Coral Reefs - UNEP - UN Environment Programme
网页Coral reefs are the most biodiverse ecosystem in our ocean. They occur in more than 100 countries and territories, and whilst they cover less than 1 per cent of the seafloor, they support at least 25 per cent of marine species – harbouring the highest biodiversity of any ecosystem globally and making them one of the most valuable ecosystems ...
Reef - National Geographic Society
网页2023年10月19日 · Because the algae that live in coral thrive only in warm water, coral reefs grow mostly in the ocean waters of the tropics. In addition to warm water, coral needs water that is clear. Water filled with silt or other sediment would suffocate the polyps. Some corals, however, do not need algae to survive.
Coral Reefs | Learn Science at Scitable - Nature
网页Coral reefs are one of the most diverse ecosystems on the planet. What are the abiotic and biotic interactions that structure this diverse ecosystem?
Scientists are trying to save coral reefs. Here's what's working.
网页June 4, 2020. • 9 min read. The world’s coral reefs do more for the planet than provide underwater beauty. They buffer shorelines from the effects of hurricanes. An estimated 500 million people...
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