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From tropics to poles: Study reveals diversity of life in soils
Date:10/18/2011

Microscopic animals that live in soils are as diverse in the tropical forests of Costa Rica as they are in the arid grasslands of Kenya, or the tundra and boreal forests of Alaska and Sweden.

That conclusion is found in research results published today in the journal Proceedings of the National Academy of Sciences.

Scientists have generally accepted that a wider range of species can be found above ground at the equator than at the Earth's poles.

But this study proves for the first time that the same rules don't apply to the nematodes, mites and springtails living underground.

The team of National Science Foundation- (NSF) funded ecologists includes Tiehang Wu and Jim Garey at the University of South Florida, Diana Wall at Colorado State University, Ed Ayres now at Neon Inc. in Colorado, and Richard Bardgett at the University of Lancaster in the United Kingdom.

"Scientist E.O. Wilson noted that the key to understanding Earth's biodiversity lies in exploration of its smallest life forms," said Matt Kane, program director in NSF's Division of Environmental Biology, which funded the research.

"Important affirmation of this idea is provided in this global study of animals, in which the significance of belowground biodiversity is revealed."

This is the first comprehensive molecular analysis--at nearly a species resolution--of the global distribution of soil animals across a broad range of ecosystems from the tropics to the poles.

Soil samples were taken from 11 sites around the world, including tropical forest in Costa Rica, arid grassland in Kenya, warm temperate forest in New Zealand, shrub steppe of Argentina and tundra and boreal forest of Alaska and Sweden.

Through DNA testing, researchers found that each location had a diversity of soil animals, but that each ecosystem is unique with its own soil animals--illustrating an "amazing diversity of species" that had never been dis
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Contact: Cheryl Dybas
cdybas@nsf.gov
703-292-7734
National Science Foundation
Source:Eurekalert  

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