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

作　　者：SHI PeiJian HUI Cang MEN XingYuan ZHAO ZiHua OUYANG Fang GE Feng JIN XianShi CAO HaiFeng LI B.Larry 

机构地区：[1]State Key Laboratory of Integrated Management of Pest Insects and Rodents in Agriculture,Institute of Zoology,Chinese Academy of Sciences [2]Key Laboratory of Sustainable Development of Marine Fisheries,Ministry of Agriculture,Yellow Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences [3]Centre for Invasion Biology,Department of Botany and Zoology,Stellenbosch University [4]Institute of Plant Protection,Shandong Academy of Agricultural Sciences [5]Ecological Complexity and Modeling Laboratory,University of California

出　　处：《Science China(Life Sciences)》2014年第7期718-725,共8页中国科学（生命科学英文版）

基　　金：supported by the National Natural Science Foundation of China (31030012);the National Key Technology Research & Development Program,China (2013CB127604);the Special Fund for Agro-scientific Research in the Public Interest,China (201103012);support from the National Research Foundation,South Africa (76912 and 81825);supported by the University of California Agricultural Experiment Station,Riverside,CA,USA

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.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.

关 键 词：trophic level stability generalized additive model MONOCULTURE POLYCULTURE 

分 类 号：S433[农业科学—农业昆虫与害虫防治]