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Heavy Livestock Grazing Promotes Locust Outbreaks by Lowering Plant Nitrogen Content

meijin 添加于 2012/2/2 12:53:22  1407次阅读 | 0次推荐 | 0个评论

Current paradigms generally assume that increased plant nitrogen (N) should enhance herbivore performance by relieving proteinlimitation, increasing herbivorous insect populations. We show, in contrast to this scenario, that host plant N enrichmentand high-protein artificial diets decreased the size and viability of Oedaleus asiaticus, a dominant locust of north Asian grasslands. This locust preferred plants with low N content and artificial diets with lowprotein and high carbohydrate content. Plant N content was lowest and locust abundance highest in heavily livestock-grazedfields where soils were N-depleted, likely due to enhanced erosion. These results suggest that heavy livestock grazing andconsequent steppe degradation in the Eurasian grassland promote outbreaks of this locust by reducing plant protein content.

作 者:Cease, Arianne J.; Elser, James J.; Ford, Colleen F.; Hao, Shuguang; Kang, Le; Harrison, Jon F.
期刊名称: Science
期卷页: 01/27/2012 第335卷 第6067期 467~469页
学科领域:生命科学 » 生物物理、生物化学与分子生物学 » 生物化学
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原文链接:http://www.sciencemag.org/content/335/6067/467.abstract
DOI: 10.1126/science.1214433
ISBN: 0036-8075
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相关报道: http://paper.sciencenet.cn/htmlpaper/20122214334095022037.shtm
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