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![]() SUBSTRATE: Waterlogged, anaerobic, brackish sediment deposited by freshwater runoff and tides, and increased by organic matter from mangroves. TOPOGRAPHY: Low-lying, intertidal zone, with some extensive to irregularly flooded higher fringe areas. VEGETATION / ALGAE: Three species of true mangroves—red mangrove dominates middle and lower portions of intertidal and upper subtidal zone; black mangrove dominates upper intertidal zone and irregularly flooded higher elevations; white mangrove is found in patches in higher parts of intertidal zone; buttonwood is often on upland fringe; all grow as trees or large shrubs. FAUNA: Valuable habitat for wide range of invertebrates and vertebrates, including 220 fish and 181 bird species; habitat of endangered American crocodile and Florida manatee. PROCESSES / DYNAMICS / ABIOTIC FACTORS: Limited by temperature to tropics and subtropics; fluctuations of water level necessary for proper development; salt water excludes potential plant competitors; hurricanes may prevent mangroves from reaching maximum heights. NEGATIVE IMPACTS: Thousands of acres have been destroyed and replaced with filled and developed land; can be seriously damaged by oil spills and herbicides; both sport and commercial fisheries decline when mangroves are destroyed. ![]() The relationship between mangroves and their associated marine life cannot be overemphasized. Mangroves provide protected nursery areas for fishes, crustaceans, and shellfish. They also provide food for a multitude of marine species such as snook, snapper, tarpon, jack, sheepshead, red drum, oyster, and shrimp. Florida's important recreational and commercial fisheries will drastically decline without healthy mangrove forests. Many animals find shelter either in the roots or branches of mangroves. Mangrove branches are rookeries, or nesting areas, for beautiful coastal birds such as brown pelicans and roseate spoonbills. Mangroves also filter water and maintain water quality and clarity. Worldwide, more than 50 species of mangroves exist. Of the three species found in Florida, the red mangrove is probably the most well-known. It typically grows along the water's edge. The red mangrove is easily identified by its tangled, reddish roots called "prop roots." These roots have earned mangroves the title, "walking trees." The mangrove appears to be standing or walking on the surface of the water. Mangroves are common as far north as Cedar Key on the Gulf coast and Cape Canaveral on the Atlantic coast. Black mangroves can occur farther north in Florida than the other two species. Frequently, all three species grow intermixed. |
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