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Coral reef Wikipedia ~ A coral reef is an underwater ecosystem characterized by reefbuilding 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

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

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 coral reef fish population Explore a coral reef in the South Pacific and learn about its diverse fish population which includes humphead coral reef cleaner fish remora Learn about cleaner fish and remora two fishes often found in coral reefs Contunico © ZDF Enterprises

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

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 ~ What are the main threats to coral reefs Climate change Corals cannot survive if the water temperature is too high Overfishing This affects the ecological balance of coral reef communities Unsustainable coastal development Tourist resorts and other coastal infrastructure have been

Coral reef ecosystems National Oceanic and Atmospheric ~ Coral reefs are some of the most diverse ecosystems in the world Coral polyps the animals primarily responsible for building reefs can take many forms large reef building colonies graceful flowing fans and even small solitary organisms

Threats to Coral Reefs Coral Reefs US EPA ~ Most coral reefs occur in shallow water near shore As a result they are particularly vulnerable to the effects of human activities both through direct exploitation of reef resources and through indirect impacts from adjacent human activities on land and in the coastal zone