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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 belongs to the class Anthozoa in the animal phylum Cnidaria, which includes sea anemones and ...
The classification of corals has been discussed for millennia, owing to having similarities to both plants and animals. Aristotle's pupil Theophrastus described the red coral, korallion, in his book on stones, implying it was a mineral, but he described it as a deep-sea plant in his Enquiries on Plants, where he also mentions large stony plants that reveal bright flowers when under water in ...
A striped surgeonfish amongst the coral on Flynn Reef. There are at least 330 species of ascidians on the reef system with the diameter of 1–10 cm (0.4–4 in). Between 300 and 500 species of bryozoans live on the reef. [54] Four hundred coral species, both hard corals and soft corals inhabit the reef. [46]
Set off the coast of Sablayan, Apo Reef Natural Park spans 13 square miles (around 33 square kilometers), making it the world’s second-largest contiguous coral reef system after Australia’s ...
Corals and coral reefs are endangered due to global warming, which results in coral bleaching. According to UNESCO, the coral reefs in all 29 reef-containing World Heritage sites would cease to ...
Canton Island typifies the isolated coral atolls dotting the Pacific Ocean. The Structure and Distribution of Coral Reefs, Being the first part of the geology of the voyage of the Beagle, under the command of Capt. Fitzroy, R.N. during the years 1832 to 1836, was published in 1842 as Charles Darwin's first monograph, and set out his theory of the formation of coral reefs and atolls.
According to a report released by AIMS, in the reefs surveyed between August 2021 and May 2022, the average hard coral cover increased to 36% from 27% in the northern region, and a 33% from 26% in ...
Coral reefs are some of the most biodiverse habitats on earth, supporting large numbers of species of corals, fish, molluscs, worms, arthropods, starfish, sea urchins, other invertebrates and algae. Because of the photosynthetic requirements of the corals, they are found in shallow waters, and many of these fringe land masses. [ 24 ]