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Heat sensitivity of eggs attributes to the reduction in Agasicles hygrophila population

Insect Science 2020年第1期27卷 159-169页

作者： Dong Jia Xiao-Fang Yuan Yan-Hong Liu Chao-Qian Xu Yuan-Xin Wang Ling-Ling Gao Rui-Yan Ma College of Agriculture Shanxi Agricultural UniversityTaiguShanxiChina College o f life Science Shanxi Agricultural UniversityTaiguShanxiChina CSIRO Agriculture and Food Centre for Environment and Life SciencesWembleyWestern AustraliaAustralia

Agasicles hygrophila has been introduced worldwide as a control agent for the invasive weed Alternanthera ***,global warming has potential impact on its controlling *** aim of this research was to explore the primary factors responsible for the greatly reduced *** population in hot *** imitate the temperature conditions in summers,different developmental stages of hygrophila were treated with high temperatures from 32.5℃ to 45℃ for 1-5 *** on the survival rate,the heat tolerance of each developmental stage was ranked from lowest to highest as follows:egg,1st,2nd,3rd instar larva,adult and *** showed the lowest heat tolerance with 37.5℃ as the critical temperature affecting larval *** treatment of the *** eggs at 37.5℃ for 1 h decreased the hatch rate to 24%.Our results indicated that when compared with the control at 25℃,1 h treatment at 37.5℃ prolonged the duration of the egg stage,shortened the duration of oviposition and total longevity,and changed the reproductive pattern of *** net reproductive rate,intrinsic rate and finite rate were all significantly *** results suggest that low heat tolerance of the eggs was the major factor responsible for the reduction of *** populations,and the key temperature was 37.5°***,appropriate measures should be taken to protect eggs in order to maintain the efficacy of *** in the biological control of *** in hot summers.

关键词： age-stage two-sex life table alligator weed flea beetle heat tolerance population dynamics

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