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Date : 2013-04-23
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Coral reef Wikipedia ~ A coral reef is an underwater ecosystem characterized by reefbuilding are formed of colonies of coral polyps held together by calcium 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 sea anemones corals secrete hard carbonate
Corals and Coral Reefs Smithsonian Ocean ~ Coral reefs are the most diverse of all marine ecosystems They teem with life with perhaps onequarter of all ocean species depending on reefs for food and shelter This is a remarkable statistic when you consider that reefs cover just a tiny fraction less than one percent of the earth’s surface and less than two percent of the ocean bottom
Coral Reefs Biscayne National Park National Park ~ Coral reefs are among the most biologically diverse ecosystems on earth Every crack and crevice seems to be occupied Knowledge of reefs is constantly growing This knowledge will be increasingly valuable as reefs around the world experience problems from pollution overfishing boat groundings climate change
What Are Coral Reefs Live Science ~ Coral reefs are typically divided into four categories according to CORAL fringing reefs barrier reefs patch reefs and atolls Fringing reefs are the most commonly seen reef and grow near coastlines Barrier reefs differ from fringing reefs in that they are separated from the coastlines by deeper wider lagoons
Coral reef geology Britannica ~ 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
NOAA CoRIS What are Coral Reefs ~ Coral reefs begin to form when freeswimming coral larvae planulae attach to the submerged edges of islands or continents As the corals grow and expand reefs take on one of three major characteristic structures—fringing barrier or g reefs which are the most common project seaward directly from the shore forming borders along the shoreline and surrounding islands
Coral reefs WWF ~ Coral reefs Coral reefs only occupy 01 of the area of the ocean but they support 25 of all marine species on the planet In fact the variety of life associated with coral reefs rivals that of the tropical forests of the Amazon or New Guinea
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