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Coral Reefs


Atolls are formed out in the middle of the ocean by volcanic subsidence, while fringing and barrier reefs form near continents. Florida contains both of these kinds of reefs, not as far offshore as Australia's Great Barrier Reef, but not terribly close either. Most are eight to eleven kilometers (five to seven miles) offshore. All three kinds of reefs can have associations, called patch reefs, which are small, shallow-water clusters or offshoots. In Florida, patch reefs can be as close as one hundred meters to the shore. Ancient limestone reefs have occupied the Florida peninsula intermittently over the past 150 million years (Discover, 1997). Florida's present coral reefs came into existence 5,000 to 7,000 years ago, when sea levels rose following the Wisconsin Ice Age. The reefs in the Florida Keys are part of the third largest barrier reef system (360 square kilometers from Miami to the Dry Tortugas).
             Coral reefs are continuously being both built up and decomposed, so different parts of a reef are in varying stages of succession. Coral reefs are very fragile, because reef-building organisms cannot thrive if the surrounding water changes significantly. Coral reefs require very specific conditions in order to grow: a solid structure for the base; warm and consistent water temperatures (averaging between 20 and 30 degrees Celsius); stable salinity; moderate wave action; and clear water that is low in nutrients and plankton. The water on a healthy coral reef is clear because there are very few nutrients, so plankton that would cloud the water are few. In general corals grow slowly, but they are extremely efficient at living and reproducing in these conditions.
             Reefs matter in many ways:.
            
             • Links to other coastal ecosystems: such as mangroves and sea grasses. .
            
             • Living breakwaters: Reefs protect coastal areas from storms, floods, and erosion. They are the key to many a surfer's "perfect wave," and contribute sand to the growth of beaches.


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