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In grasslands remade by humans, animals may protect biodiversity
Date:3/9/2014

capture a nutrient pulse, Gruner explained. These differing strategies create a diverse grassland ecosystem.

In the human-altered world where nutrients are always plentiful, plants that put their effort into growing tall to capture sunlight have an advantage. They block the sunlight from reaching most other plant species, which cannot grow or reproduce. But grazing animals cut down the light-blocking plants and give the others a chance to bloom.

"Where we see a change in light, we see a change in diversity," said Borer, the lead author. "Our work suggests that two factors which humans have changed globally, grazing and fertilization, can control ground-level light. Light appears to be very important in maintaining or losing biodiversity in grasslands."

The effect was greatest where large animals, wild and domesticated, grazed on the test plots: cattle, pronghorn and elk on North America's Great Plains; wildebeests and impala on Africa's Serengeti; and horses, sheep and ibex in rural India. In places where the only grazers were small animals like rabbits, voles and gophers, the grazers' effect was weak and variable.


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Contact: Heather Dewar
hdewar@umd.edu
301-405-9267
University of Maryland
Source:Eurekalert  

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