Flower Garden Banks National Marine Sanctuary Profile
Underwater Gardens
A pair of underwater gardens emerge from the depths of the Gulf of Mexico, like oases in the desert, 100 mi off the coasts of Texas and Louisiana. Named for the beautifully colored fish and coral rocks that fishermen found there in the early 1900s, the Flower Garden Banks are surface expressions of salt domes beneath the sea floor. This premiere diving destination harbors the northernmost coral reefs in the United States, and serves as a regional reservoir of shallow-water Caribbean reef fish and invertebrates.
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The Flower Garden Banks comprise 56 sq mi that include two coral-reef-capped banks and one sandstone bank with fire coral and sponge-covered pinnacles and flats. The feature was designated as a national marine sanctuary in 1992, and amended in 1996 to include the Stetson Bank. A digital map of the area identifies these protected areas.
The key habitats to be explored include sand flats, soft sediments, bank reefs, drowned reefs, pinnacles, hard substrate (also called hard bottom), algal sponge communities, brine seeps/flows, fault scarps, and artificial reefs.
Key species include star coral, brain coral, manta rays, hammerhead sharks, and endangered loggerhead sea turtles.
Every winter, hundreds of hammerhead sharks and spotted eagle rays school at the Flower Garden Banks for reasons still not understood.
The East Flower Garden Brine Seep, a 60 m-wide pool of anoxic brine that is seven times saltier than the surrounding water, supports sulfide-oxidizing bacteria that provide a food source for deep-water fish and invertebrates on the bank.
Every year, seven to ten evenings after the August full moon, corals and invertebrates spawn en masse, filling the crystal clear water over the banks with egg and sperm packets the size of BBs and creating what looks like an underwater snowstorm.
Corals at the Flower Garden Banks can equal the size of small houses, but certain species don’t exist at all on the reef cap, including all the shallow-water soft corals found elsewhere in the western Atlantic.
Coral cover, which is an exceptional 50%, and other measures of environmental quality suggest that the Flower Garden Banks have remained healthy since observations of the reefs began in the 1960s.
Whale sharks the size of buses regularly visit the Flower Garden Banks, but little is known about how they use the resources there (or anywhere else).
The Flower Garden Banks are the northernmost coral reefs on the North American continental shelf; the only Atlantic reefs found further north are in Bermuda.
http://oceanexplorer.noaa.gov/explorations/islands01/background/islands/sup2_fgnms.html
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