Coral reefs threatened by oceans' acid levels
Source: Agencies |
July 10, 2012, Tuesday
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Print Edition
Print Edition
OCEANS' rising acid levels have emerged as one of the biggest threats to coral reefs, acting as the "osteoporosis of the sea" and threatening everything from food security to tourism to livelihoods, the head of a United States scientific agency said yesterday.
The speed by which the oceans' acid levels has risen caught scientists off-guard, with the problem now considered to be climate change's "equally evil twin," National Oceanic and Atmospheric Administration chief Jane Lubchenco said.
"We've got sort of the perfect storm of stressors from multiple places really hammering reefs around the world," said Lubchenco, who was in Australia to speak at the International Coral Reef Symposium in the northeastern city of Cairns, near the Great Barrier Reef.
Oceans absorb excess carbon dioxide in the atmosphere, increasing sea acidity. Scientists are worried about how that increase will affect sea life, particularly reefs, as higher acid levels make it tough for coral skeletons to form. Lubchenco likened ocean acidification to osteoporosis - a bone-thinning disease - because researchers are concerned it will lead to the deterioration of reefs.
Higher acidity levels are especially problematic for creatures such as oysters, because acid slows the growth of their shells. Experiments have shown other animals, such as clown fish, also suffer. In a study that mimicked the level of acidity scientists expect by the end of the century, clown fish began swimming toward predators, instead of away from them, because their sense of smell had been dulled.
The speed by which the oceans' acid levels has risen caught scientists off-guard, with the problem now considered to be climate change's "equally evil twin," National Oceanic and Atmospheric Administration chief Jane Lubchenco said.
"We've got sort of the perfect storm of stressors from multiple places really hammering reefs around the world," said Lubchenco, who was in Australia to speak at the International Coral Reef Symposium in the northeastern city of Cairns, near the Great Barrier Reef.
Oceans absorb excess carbon dioxide in the atmosphere, increasing sea acidity. Scientists are worried about how that increase will affect sea life, particularly reefs, as higher acid levels make it tough for coral skeletons to form. Lubchenco likened ocean acidification to osteoporosis - a bone-thinning disease - because researchers are concerned it will lead to the deterioration of reefs.
Higher acidity levels are especially problematic for creatures such as oysters, because acid slows the growth of their shells. Experiments have shown other animals, such as clown fish, also suffer. In a study that mimicked the level of acidity scientists expect by the end of the century, clown fish began swimming toward predators, instead of away from them, because their sense of smell had been dulled.
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