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ScienceDaily_2014 14222.txt

#In grasslands remade by humans, animals may protect biodiversity: Grazers let in the light, rescue imperiled plantsa comparative study of grasslands on six continents suggests there may be a way to counteract the human-made overdose of fertilizer that threatens to permanently alter the biodiversity of the world's native prairies. The solution is one that nature devised: let grazing animals crop the excess growth of fast growing grasses that can out-compete native plants in an over-fertilized world. And grazing works in a way that is also natural and simple. The herbivores or grazing and browsing animals feed on tall grasses that block sunlight from reaching the ground making the light available to other plants. That's the key finding of a five-year study carried out at 40 different sites around the world and scheduled for online publication March 9 2014 in the journal Nature. More than 50 scientists belonging to the Nutrient Network a team of scientists studying grasslands worldwide co-authored the study. This study has tremendous significance because human activities are changing grasslands everywhere said study co-author Daniel S. Gruner associate professor of entomology at the University of Maryland. We're over-fertilizing them and we're adding and subtracting herbivores. We have a worldwide experiment going on but it's completely uncontrolled. Gruner a member of the Nutrient Network (which participants have nicknamed Nutnet) since its founding in 2006 helped plan the worldwide study and analyze its results. Elizabeth Borer of the University of Minnesota was the study's lead author. The U n. Food and Agricultural organization estimates that grasslands cover between one-fifth and two-fifths of the planet's land area and are home to more than one-tenth of humankind. But like all plant communities grasslands are suffering from too much fertilizer. As humans burn fossil fuels dose crops with chemical fertilizers and dispose of manure from livestock they introduce extra nitrogen and other nutrients into the soil air and water. The excess is a special problem for grasslands where many plants like annual wildflowers and others have adapted to low nutrient levels. They often struggle to compete against grasses that use the extra nutrients to grow faster and bigger. At the same time grasslands worldwide are being converted to pastures for domestic animals with native grazers like elk and antelope giving way to cattle and sheep. Ecological theory asserts that grazers can counteract the effects of over-fertilizing in most cases but the theory has never been tested broadly Gruner said. To do that the Nutnet scientists ran essentially the same experiment worldwide marking off test plots in groups of four at each of 40 sites. In each group one plot was fenced to keep grazing animals out. One was treated with a set dose of fertilizers to mimic the effect of excess nutrients from human sources but was fenced not so the animals could graze. One was fenced both and fertilized. And one was left alone. The researchers did not try to alter the test sites'animal populations. In some places native animals were abundant. At others they'd been replaced mostly by domestic animals like cattle goats and sheep. And still others were former pastures where livestock had browsed in the past but were no longer there. In general where fertilizer was added and grazing animals were kept out the variety of plants in the experimental plots decreased. Where animals were allowed to graze in the fertilized plots plant diversity generally increased. The researchers'data analysis concluded that the grazers improved biodiversity by increasing the amount of light reaching ground level. Grassland plants have evolved a variety of strategies to take advantage of a setting where nutrients are in short supply and inconsistently available. They may be ground-hugging or ephemeral or shoot up when they 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. Story Source: The above story is provided based on materials by University of Maryland. Note: Materials may be edited for content and length. Journal Reference e

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