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New study shows that Florida's reefs cannot endure a 'cold snap'
Date:8/26/2011

Miami August 26, 2011 Remember frozen iguanas falling from trees during Florida's 2010 record-breaking cold snap? Well, a new study led by scientists at the University of Miami (UM) Rosenstiel School of Marine & Atmospheric Science shows that Florida's corals also dropped in numbers due to the cold conditions.

"It was a major setback," said Diego Lirman, associate professor at the UM Rosenstiel School and lead author of the study. "Centuries-old coral colonies were lost in a matter of days."

The chilly January temperatures caused the most catastrophic loss of corals within the Florida Reef Tract, which spans 160 miles (260 kilometers) from Miami to the Dry Tortugas and is the only living barrier reef in the continental U.S.

Members of the Florida Reef Resilience Program, a group comprised of Florida scientists and resource managers, conducted a month-long survey of 76 reefs sites from Martin County to Key West, both during and shortly after the unusually cold weather.

The research team compared the mortality rates of corals from the cold event to warm-water events, such as the highly publicized bleaching event in 2005, and concluded that the cold-water event cause even more widespread morality than previous warm-water events. The results were published in the August 2011 issue of the journal PLoS One.

The study found coral tissue mortality reached over 40-percent for several important reef-building species and that large colonies in shallow and near-shore reefs were hardest hit. This is in contrast to a less than one-percent tissue mortality caused by warm-water events since 2005. Coral species that had previously proven tolerant to higher-than-normal ocean temperatures were most affected by the cold-water event.

"This was undoubtedly the single worst event on record for Florida corals," said Lirman.

Ice-cold Arctic air swept into Florida in early January 2010, plummeting air temperatur
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Contact: Barbra Gonzalez
barbgo@rsmas.miami.edu
305-421-4704
University of Miami Rosenstiel School of Marine & Atmospheric Science
Source:Eurekalert  

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