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Map of the Florida Keys showing sites (red stars) where calcification monitoring stations are located. Our work occurs within the boundaries of Biscayne National Park, the Florida Keys National Marine Sanctuary, and Dry Tortugas National Park. Stations are on the outer-reef tract in approximately 12 to 15 feet (4 to 5 m) of water depth in relic spur-and-groove or hard-bottom habitat.