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Global warming rattles food chain in the Antarctic

WASHINGTON — Changing wind patterns linked to global warming are altering the food chain in Antarctica and may lead to further increases in greenhouse gases in the atmosphere.

The most basic food, plankton, is declining in the northern portions of the Antarctic peninsula reaching toward South America, researchers report in Friday's edition of the journal Science.

At the same time, populations of Adelie penguins, which require a colder climate, have dropped sharply in that region.

"We're showing for the first time that there is an ongoing change on phytoplankton concentration and composition along the western shelf of the Antarctic Peninsula that is associated with a long-term climate modification. These phytoplankton changes may explain in part the observed decline of some penguin populations," Martin Montes-Hugo, a marine scientist at Rutgers University, said in a statement.

Andrew Monaghan, a polar expert at the National Center for Atmospheric Research in Boulder, Colo., said the report ties all the implications of global warming together in a biological chain of events

A direct cause-and-effect relationship of the team's findings is still unproven, Montes-Hugo said, but it's clear that the changes in phytoplankton, krill and penguin distribution do resemble a chain reaction."

The change reflects shifting patterns of cloud cover, ice formation and winds, the report said.

A separate report in the same edition of Science raises the possibility that new wind patterns could result in more upwelling of deep water in the region, which would then release stored carbon dioxide, potentially increasing global warming.

"The faster the ocean turns over, the more deep water rises to the surface to release CO2," said Robert Anderson, a geochemist at Columbia University's Lamont-Doherty Earth Observatory. "It's this rate of overturning that regulates CO2 in the atmosphere."

Information from the Associated Press and San Francisco Chronicle was used in this report.

Global warming rattles food chain in the Antarctic 03/12/09 [Last modified: Thursday, March 12, 2009 11:17pm]
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