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Chemical pollution and human sewage could be killing corals

BOSTON You can forget global warming as the sole culprit. A combination of human sewage and shipyard discharge may be responsible for the development and spread of deadly black band disease in corals, researchers at the University of Illinois say.

Black band disease is characterized by a ring-shaped bacterial mat that migrates across a coral colony, leaving dead tissue in its wake, said UI geologist Bruce Fouke. Like a tropical rainforest, a coral reef system is a cradle of biodiversity. If we destroy the reefs, we destroy the oceans ability to reproduce.

To better understand the disease, Fouke and his colleagues, UI microbiologist Abigail Salyers and postdoctoral researchers George Bonheyo and Jorge Frias-Lopez, studied corals off the island of Curacao in the Netherlands Antilles, near the Venezuelan coast. First, the researchers mapped outbreaks of the disease along the reef. Then they looked for metals such as aluminum, cadmium and zinc that are common pollutants from shipyards and oil refineries.

The highest number of infected corals, as well as the highest concentration of dissolved metals, occurred near the city of St. Annabaai, which has a major harbor and one of the largest oil refineries in the Caribbean, Fouke said. This suggests that diseased coral may be experiencing increased environmental stress due to pollution, which in turn decreases the corals resistance to bacterial infection. Healthy corals contain a natural population of bacteria within a mucous-rich biofilm that provides protection from light, exposure and sedimentation, Fouke said. Environmental stresses cause corals to secrete more of this mucous to coat their outer tissues. This leads to elevated levels of natural microbial populations, as well as the introduction of new, potentially harmful bacterial populations.

To identify the microbes inhabiting the black band biomat, the researchers extracted the microbes DNA, amplified and sequenced it. They
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Contact: James E. Kloeppel
kloeppel@uiuc.edu
217-244-1073
University of Illinois at Urbana-Champaign
6-Nov-2001


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