Contrasting responses of an invasive plant to herbivory of native and introduced insects  

作　　者：Qiu‑Yue Fu Guan‑Wen Wei Mo‑Zhu Wang Yuan Cui Bi‑Cheng Dong Fei‑Hai Yu 

机构地区：[1]School of Ecology and Nature Conservation,Beijing Forestry University,Beijing 100083,China [2]Ecology and Genetics Unit,University of Oulu,Oulu,Finland [3]State Key Laboratory of Plant Diversity and Specialty Crops&Key Laboratory of Systematic and Evolutionary Botany,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China [4]China National Botanical Garden,Beijing 100093,China [5]Yunnan Key Laboratory of Plateau Wetland Conservation,Restoration and Ecological Services,National Plateau Wetlands Research Center,Southwest Forestry University,Kunming 650224,China [6]The Key Laboratory of Ecological Protection in the Yellow River Basin of National Forestry and Grassland Administration,Beijing Forestry University,Bei‑jing 100083,China [7]Institute of Wetland Ecology and Clone Ecology/Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation,Taizhou University,Taizhou 318000,Zhejiang,China

出　　处：《Ecological Processes》2024年第4期242-253,共12页生态过程(英文)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.31500331,32071527).

摘　　要：Background Interactions between alien plants and insect herbivores in introduced ranges may determine their invasion success. However, few studies have investigated whether alien plants respond differently to native and introduced herbivores in their introduced ranges and whether genotypes of alien plants matter. We conducted a green-house experiment to examine the effects of herbivory by a native insect(Spodoptera litura), by an introduced insect(S. frugiperda), and simultaneously by both insect species on growth, morphology, and biomass allocation of 17 genotypes of an invasive alien clonal plant Hydrocotyle verticillata, and used selection gradient analysis to test which herbivory conditions favor selection of a specific leaf or root trait value.Results Different genotypes of H. verticillata showed significant variation in growth, morphology, and biomass allocation, but their responses to herbivory were relatively consistent. All three herbivory treatments significantly decreased total mass and stolon mass, but herbivory of S. frugiperda increased specific leaf area. Herbivory of S. litura and simul-taneous herbivory of both insect species also decreased leaf mass, petiole mass, root mass, and ramet mass. Selection gradient analysis showed that leaf and root traits varied under different herbivory treatments. To achieve greater fitness, as measured by total mass and/or number of ramets, H. verticillata favored larger leaf area under herbivory by S. frugiperda, larger leaf area and lower specific leaf area under herbivory by S. litura, and larger leaf area, lower specific leaf area, and lower root-to-shoot ratio under simultaneous herbivory.Conclusions H. verticillata demonstrated contrasting responses to herbivory by native and introduced insects, showing a remarkable ability to coordinate leaf trait plasticity and optimize biomass allocation. This strategy allows H. verticillata to achieve greater fitness under various herbivory conditions, potentially contributing to its invasion success. These findings high

关 键 词：Hydrocotyle verticillata Invasive plant Introduced herbivore Native herbivore Phenotypic plasticity Selection gradient analysis 

分 类 号：Q948.122[生物学—植物学]