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UI Researcher's Study On Termite Bacteria May Aid In Greenhouse Gas Understanding

IOWA CITY, Iowa -- Most people would rather see wood-eating termites completely exterminated. However, these insects' digestive processes,which prove so maddening to homeowners, may provide insight into why some animals produce more greenhouse gasses than others, said a University of Iowa researcher whose work appears in the Jan. 29 issue of Science.

Jared Leadbetter, Ph.D., a UI postdoctoral associate of microbiology, has built upon earlier studies that found wood-feeding termites digest their fiber-rich food in a highly productive manner and, consequently, emit less methane into the atmosphere than expected. Methane is a potent greenhouse gas and a major contributor to global warming, according to the U.S. Environmental Protection Agency (EPA). In comparison to termites, cattle, which also have a diet rich in fiber, are less efficient. As much as 20 percent of the energy contained in the grass that cows chew is later emitted into the atmosphere as methane.

Scientists do not understand which factors lead to these two very different outcomes. Learning more about termites could lead to improvements in cattle nutrition and decreases in their methane emissions, Leadbetter said.

As a contributor to global warming, methane is second only to carbon dioxide, according to the EPA. Over the last 200 years, methane concentrations have more than doubled, largely due to human-related activities. Livestock are among the largest sources of methane from human-related activities. The roughly 100 million cattle in the United States produce about six million metric tons of methane into the atmosphere annually, the EPA found.

In the article that appears in Science, Leadbetter and his colleagues investigated bacteria known as spirochetes that are found in termites' guts. Leadbetter and his colleagues conducted the research at Michigan State University, where Leadbetter pursued his doctoral and post-doctoral studies. Leadbetter came to the UI in June 1998.

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Contact: Jennifer Cronini
jennifer-cronin@uiowa.edu
319-335-9917
University of Iowa
29-Jan-1999


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