Résultats de recherche
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. Most coral reefs are built from stony corals, whose polyps cluster in groups. Coral belongs to the class Anthozoa in the animal phylum Cnidaria, which includes sea anemones ...
19 oct. 2023 · Learn about the importance, diversity, and threats of coral reefs, the rain forests of the seas. Find out how climate change, ocean acidification, and human activities affect these vital habitats and what we can do to protect them.
Il y a 3 jours · Coral reef, ridge or hummock formed in shallow ocean areas by algae and the calcareous skeletons of coral polyps and other coelenterates. A coral reef may grow into a permanent coral island. Often called ‘rainforests of the sea,’ coral reefs are home to a spectacular variety of organisms.
7 nov. 2017 · What are coral reefs? Coral can be found in tropical ocean waters around the world. But how much do you know about reefs and the tiny animals—polyps—that bui...
1 févr. 2019 · Learn about the diversity, characteristics, benefits, and threats of coral reefs, some of the most diverse ecosystems in the world. Find out how NOAA scientists study, protect, and conserve these vital habitats and the organisms that depend on them.
19 oct. 2023 · Learn about coral, the animal that forms reefs and hosts algae in a symbiotic relationship. Discover the diversity, importance, and threats of coral reefs, the rainforests of the sea.
Coral reefs cover less than 1 per cent of the seafloor, but they support at least 25 per cent of marine species. Coral reefs are the most vulnerable marine ecosystem to climate change, and up to 90 per cent of corals could be lost by 2050, even if warming is limited to an increase of 1.5°C.
