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How a bizarre ocean current could create coral refuges (+video)

Warming in the Pacific could lead to new currents that create islands of refuge for corals, new research suggests. 

Researchers at the University of Miami are warning that ocean acidification in the Caribbean has become so serious that once abundant corals are heading towards extinction. In a recent paper published in "Proceeding of the National Academy of Sciences" (PNAS), the scientists say that over the next century recruitment of new corals could drop by more than 70 percent as Carbon Dioxide levels from global warming turn the oceans more acidic.
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Global warming is expected to have devastating effects on coral reefs, but recent research points to a few exceptions.

Warming in the equatorial Pacific may actually create refuges for corals around a handful of islands, even as it bleaches, or kills, corals elsewhere, suggests new research that predicts increased upwelling of cold, nutrient-rich water in these places.

"These little islands in the middle of the ocean can counteract global trends and have a big impact on their own future, which I think is a beautiful concept," said study researcher Kristopher Karnauskas, a Woods Hole Oceanographic Institution scientist, in a press release issued by the institution.

If predictions made by Karnauskas and colleague Anne Cohen are accurate, warming around the Gilbert Islands will be slower than elsewhere, giving the corals and their symbiotic algae a better chance to adapt. Perhaps these refuges could eventually become a source of new corals and other species that could recolonize reefs damaged by warming, Karnauskas said.

Corals are animals that host tiny plants, or algae, that feed them using photosynthesis. The reefs corals build provide important habitat for many species. Warming water can cause corals to expel their algae, a phenomenon called bleaching, which turns the corals white and puts them under great stress and at risk of death.  

Global climate models predict the central tropical Pacific will warm by about 5.0 degrees Fahrenheit (2.8 degrees Celsius) by the end of the century. To get a better idea of how conditions might play out on a small geographic scale, the researchers used the global models in combination with a fine-scale regional model.

The low-lying coral atoll islands, part of the nation of Kiribati, are as small as 1.54 square miles (4 square kilometers).


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