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Plant composition changes in a small-scale community have a large effect on the performance of an economically important grassland pest

文献类型： 外文期刊

作者： Qin, Xinghu 1 ; Wu, Huihui 4 ; Huang, Xunbing 1 ; Lock, T. Ryan 5 ; Kallenbach, Robert L. 5 ; Ma, Jingchuan 1 ; Ali, M 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Plant Protect, State Key Lab Biol Plant Dis & Pests, Beijing 100193, Peoples R China

2.Univ St Andrews, Sch Biol, Inst Chuantan H Alba, Scottish Oceans Inst, St Andrews KY16 8LB, Scotland

3.Minist Agr, Sci Observat & Expt Stn Pests Xilingol Rangeland, Xilinhot 026000, Peoples R China

4.Anal Ctr Agr Experiments Tianjin Agr, Tianjin 300384, Peoples R China

5.Univ Missouri, Div Plant Sci, 108 Waters Hall, Columbia, MO 65211 USA

6.BRRI, Entomol Div, Gazipur 1701, Bangladesh

7.AgResearch, Biocontrol & Biosecur, Private Bag 4749, Christchurch 8140, New Zealand

关键词： Plant composition; Grasshopper plague; Plant stoichiometric traits; Grassland conservation

期刊名称：BMC ECOLOGY （ 影响因子：2.964； 五年影响因子：3.322 ）

ISSN：

年卷期： 2019 年 19 卷 1 期

页码：

收录情况： SCI

摘要： Background The grasshopper Oedaleus asiaticus Bey-Bienko (Acrididae: Oedipodinae) is a dominant and economically important pest that is widely distributed across the Mongolian plateau. This herbivore pest causes major damage to the grassland of the Inner Mongolian steppe in China. The population dynamics of herbivore pests is affected by grassland management practices (e.g., mowing and heavy livestock grazing) that alter plant community structures and stoichiometric characteristics. For example, O. asiaticus outbreak is closely associated with plant preference changes caused by nitrogen loss from heavy livestock grazing. However, the manner by which small-scale variation in vegetation affects grasshopper performance and promotes outbreak is poorly characterized. To address this question, we investigated the relationship between small-scale (1 m(2)) vegetation variability and measures of O. asiaticus performance associated with plant stoichiometric characteristics. Results We found that food preferences of O. asiaticus varied significantly, but maintained a specific dietary structure for different plant compositions. Notably, small-scale changes in plant community composition significantly affected grasshopper food preference and body size. Partial least-square modeling indicated that plant proportion and biomass affected grasshopper body size and density. We found that this effect differed between sexes. Specifically, female body mass positively correlated with the proportion of Stipa krylovii grass, whereas male mass positively correlated with the proportion of Artemisia frigida grass. Further analyses indicated that grasshopper performance is closely associated with plant stoichiometric traits that might be responsible for the pest's plague. Conclusions This study provides valuable information for managing grasshoppers using rational grassland management practices.

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