Ocean warming affecting Florida reefs

Ocean warming affecting Florida reefs
These are colonies of "blade fire coral" that have lost their symbiotic algae, or "bleached," on a reef off of Islamorada, Florida. Hard and soft corals are presently bleaching -- losing their symbiotic algae -- all over the coral reefs of the Florida Keys due to unusually warm ocean temperatures this summer. Months with waters warmer than 85 F have become more frequent in the last several decades compared to a century ago, stressing and in some cases killing corals when temperatures remain high for too long. Credit: Kelsey Roberts, USGS

Late-summer water temperatures near the Florida Keys were warmer by nearly 2 degrees Fahrenheit in the last several decades compared to a century earlier, according to a new study by the U.S. Geological Survey.

Researchers indicate that the warmer are stressing corals and increasing the number of bleaching events, where corals become white resulting from a loss of their . The corals can starve to death if the condition is prolonged.

"Our analysis shows that corals in the study areas are now regularly experiencing temperatures above 84 F during July, August and September; average temperatures that were seldom reached 120 years ago," said Ilsa Kuffner, a USGS research marine biologist and the study's lead author. "When corals are exposed to water temperatures above 84 F they grow more slowly and, during extended exposure periods, can stop growing altogether or die."

The new analysis compares water temperatures during two time periods a century apart at two of Florida's historic offshore lighthouses – Fowey Rocks Lighthouse, off Miami, and Carysfort Reef Lighthouse, off Key Largo, Florida. The first period included data from 1879 to 1912, while the second period spanned from 1991 to 2012. Temperatures at a third area, a reef off Islamorada, Florida, were also monitored from 1975 to 2007.

"What's interesting is that the temperature increase observed during this recent 32-year period was as large as that measured at the lighthouses spanning 120 years," said Kuffner. "This makes it likely the warming observed at the lighthouses has actually occurred since the 1970s."

The study indicates that August is consistently the month when Florida's peak. In the analysis of recent decades, for August have been at or very close to 86 F. At Fowey Lighthouse from 1879 to 1912, the average August temperature was just 84.2 F. Temperatures this August at the same location, though not included in the study, averaged 87 F.

Ocean warming affecting Florida reefs
No, that is not a mound of snow sitting on a coral reef -- it is a colony of bleached "brain coral" on a reef off of Islamorada, Florida. Hard and soft corals are presently bleaching- losing their symbiotic algae -- all over the coral reefs of the Florida Keys due to unusually warm ocean temperatures this summer. Months with waters warmer than 85 F have become more frequent in the last several decades compared to a century ago, stressing and in some cases killing corals when temperatures remain high for too long. Credit: Kelsey Roberts, USGS

Coral bleaching is currently underway in the Florida Keys, highlighting the real-time impact that warmer ocean temperatures are having on reefs. Corals can recover from bleaching if the waters cool down within a few weeks, but mortality usually ensues if corals remain bleached longer than a month or two.


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Citation: Ocean warming affecting Florida reefs (2014, September 10) retrieved 18 June 2019 from https://phys.org/news/2014-09-ocean-affecting-florida-reefs.html
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Sep 10, 2014
Deniers do not want to hear this.

They want to hear Saddam had "WMD!", and pollution will save the Earth, . . . as long as the rich get ALL the money.

Sep 10, 2014
gkam, you need a psychiatrist.

Sep 11, 2014
Wasp, you need an education.

Where do you think half of our Oxygen comes from? Do you not understand how the Marine Food Chain supports us with food and air? Are you not concerned at the signs of ocean death we are seeing?

Wake up, please.

I have a Master of Science in this field, but have to debate with those who get their opinions from political prejudice.

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