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Global Warming Has Major Impact on World's Oceans
February 18, 2008 at 11:51 AM
Environmental Health
“The world’s oceans are undergoing profound physical, chemical and biological changes whose impacts are just beginning to be felt,” said Jane Lubchenco, the Wayne and Gladys Valley Chair of Marine Biology at Oregon State University, who moderated the panel.
According to panelist Gretchen Hofmann, a molecular physiologist at the University of California, Santa Barbara, “Ocean ecosystems are facing new stresses and new combinations of stress.”
“The water is warmer, circulation patterns are changing in unpredictable ways, and oceans are becoming acidic,” he added.
Rising greenhouse gas emissions are already warming the world’s oceans and providing yet a new threat to coral reefs, which already are among the most threatened of all marine ecosystems.
“Even modest warming of a degree or two above normal maximum temperatures can cause a breakdown in the relationship between corals and their symbiotic algae, zooxanthellae,” said Nancy Knowlton, a marine biologist with the Smithsonian Institution.
According to Knowlton, “We have already lost some 80 percent of the reef corals in the Caribbean over the last three decades, and losses in the Pacific Ocean also are widespread and severe.”
“These reefs already are under threat to overfishing and local pollution and unless drastic action to reduce greenhouse gas emissions is taken soon, these reefs will cease to exist as we know them,” she added.
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