Wednesday, September 19, 2018
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Mysterious ‘white plague’ threatens South Florida coral reefs

Associated Press

MIAMI — A mysterious epidemic continues to sweep South Florida’s reefs, transforming corals into lifeless skeletons and threatening undersea structures that support tourism, provide hurricane protection and serve as homes to a vast range of marine life.

Called white plague, white blotch and other names, depending on the pattern of damaged or destroyed tissue, the disease has infected more than 20 South Florida coral species from the Middle Keys through Palm Beach County, according to the state Department of Environmental Protection.

The Sun-Sentinel reports that on the reefs running from mid-Miami-Dade County through Martin County, scientists have observed a 35 percent loss of reef-building coral.

"The reef is in a state of emergency," said Jennifer Stein, South Florida marine conservation coordinator for the Nature Conservancy. "It needs a lot of attention, a lot of research, a lot of focus, especially with this disease."

The disease arose during a worldwide, three-year coral catastrophe called bleaching, in which unusually warm ocean water led many corals to expel the piece of algae that provided them with color and gave them a source of nutrition through photosynthesis. Although coral can recover from bleaching, the ordeal weakens them and makes them vulnerable to disease.

Despite occupying only a tiny fraction of the footprint of the world’s oceans, coral reefs provide habitat for about a quarter of the world’s marine species. South Florida’s reefs, the only near-shore reefs in the continental United States, draw thousands of visitors for fishing, diving and snorkeling and provide homes to fish, crabs, lobsters, sponges, sea turtles and other creatures.

Since appearing in South Florida in late 2014, as corals were weakened by bleaching, the epidemic has spread quickly. A 35 percent loss of stony coral has taken place off the South Florida coast north of the Keys, judging from the losses seen at sites monitored by Nova Southeastern University, said David Gilliam, assistant professor of marine and environmental science at the university’s Halmos College of Natural Sciences and Oceanography.

"Stony corals are what creates the reef," he said. "If you don’t have stony corals, you won’t have continued reef growth. If the reef isn’t growing, it’s slowly dissolving. Without growth, the coral will get lost, and that will affect the entire community, from reef fishes down to lobsters."

Some species have virtually disappeared. Death claimed all but one of 65 colonies of pillar coral being monitored from central Miami-Dade County to southern Palm Beach County, Gilliam said.

Scientists don’t know whether the disease is caused by a bacteria, virus, fungus or other pathogen. They don’t know why it infects certain species and not others. They don’t know how to stop it. The state is spending $1 million this year to study it and the water conditions that surround it, with another $1 million coming next year, according to DEP.

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