Cascade effects of crop species richness on the diversity of pest insects and their natural enemies

文献类型： 外文期刊

第一作者： Shi PeiJian

作者： Shi PeiJian;Zhao ZiHua;Ouyang Fang;Ge Feng;Cao HaiFeng;Shi PeiJian;Jin XianShi;Hui Cang;Men XingYuan;Li, B. Larry

作者机构：

关键词： trophic level;stability;generalized additive model;monoculture;polyculture

期刊名称：SCIENCE CHINA-LIFE SCIENCES （ 影响因子：6.038； 五年影响因子：4.754 ）

ISSN： 1674-7305

年卷期： 2014 年 57 卷 7 期

页码：

收录情况： SCI

摘要： Understanding how plant species richness influences the diversity of herbivorous and predatory/parasitic arthropods is central to community ecology. We explore the effects of crop species richness on the diversity of pest insects and their natural enemies. Using data from a four-year experiment with five levels of crop species richness, we found that crop species richness significantly affected the pest species richness, but there were no significant effects on richness of the pests' natural enemies. In contrast, the species richness of pest insects significantly affected their natural enemies. These findings suggest a cascade effect where trophic interactions are strong between adjacent trophic levels, while the interactions between connected but nonadjacent trophic levels are weakened by the intermediate trophic level. High crop species richness resulted in a more stable arthropod community compared with communities in monoculture crops. Our results highlight the complicated cross-trophic interactions and the crucial role of crop diversity in the food webs of agro-ecosystems.

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