Named for its resemblance to deer antlers, staghorn coral (Acropora cervicornis) is a branching coral with cylindrical branches that range in length from about an inch to more than 6.5 feet. It grows anywhere between the water surface and a depth of about 100 feet. Its upper growth limit is defined by wave forces, and its lower growth limit is defined by light availability and the amount of suspended sediments in the water. The species ranges geographically from its northern limit along the east coast of Florida at about Boca Raton to its southern limit in Venezuela.
Staghorn coral is one of the most important providers of habitat for fish and many other species of marine life. Although sexual reproduction occurs through spawning each year in August or September, staghorn coral predominantly reproduces through asexual reproduction. New colonies form when branches break off of a colony and reattach to the substrate in a process called asexual fragmentation.
Dan Crossett, NPS
The species can grow remarkably fast, increasing in length by 4 to 8 inches per year. Even though staghorn coral is the fastest growing species of all corals growing in western Atlantic waters, it has been listed as federally threatened under the Endangered Species Act. Populations of staghorn coral have been collapsing throughout their range, and the species has been locally extirpated in some locations.
Disease has been the greatest source of widespread mortality, mainly white band disease. In addition, localized losses have resulted from hurricanes, bleaching, algae overgrowth, and human impacts such as pollution, increased sedimentation from erosion, and changes in temperature and salinity.
Douglas Morrison, NPS
Did You Know?
Between the months of March and September, some 100,000 sooty terns will come to nest on the islands of the Dry Tortugas. They are joined by brown noddies, roseate terns, double-crested cormorants and brown pelicans.