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Small organisms could dramatically impact world's climate
Date:10/25/2012

EAST LANSING, Mich. Warmer oceans in the future could significantly alter populations of phytoplankton, tiny organisms that could have a major impact on climate change.

In the current issue of Science Express, Michigan State University researchers show that by the end of the 21st century, warmer oceans will cause populations of these marine microorganisms to thrive near the poles and may shrink in equatorial waters. Since phytoplankton play a key role in the food chain and the world's cycles of carbon, nitrogen, phosphorous and other elements, a drastic drop could have measurable consequences.

"In the tropical oceans, we are predicting a 40 percent drop in potential diversity," said Mridul Thomas, MSU graduate student and one of the co-authors. "If the oceans continue to warm as predicted, there will be a sharp decline in the diversity of phytoplankton in tropical waters and a poleward shift in species' thermal niches, if they don't adapt to climate change."

Thomas co-authored the study with fellow MSU graduate student Colin Kremer, plant biology, and their faculty mentors Elena Litchman, MSU zoologist, and Christopher Klausmeier, MSU plant biologist. The team, which conducted its research at MSU's Kellogg Biological Station, explained that since phytoplankton play a key role in regulating atmospheric carbon dioxide levels, and thus, global climate, this shift could cause significant change.

The microorganisms use light, carbon dioxide and nutrients to grow. Although phytoplankton are small, they flourish in every ocean, consuming as much carbon dioxide through photosynthesis as all the terrestrial plants combined.

Water temperatures strongly influence their growth rates. In fact, phytoplankton in warmer equatorial waters can grow much faster than their cold-water cousins. With worldwide temperatures predicted to increase over the next century, it's important to gauge phytoplankton's reaction and what will ha
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Contact: Layne Cameron
Layne.Cameron@cabs.msu.edu
517-353-8819
Michigan State University
Source:Eurekalert

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