CO_2浓度变化下蚜茧蜂胁迫作用对多世代棉蚜适合度的影响  

Response of three successive generations of aphids to stress from Lysiphlebia japonica Ashmead under ambient CO_2 and elevated CO_2

作　　者：李姣[1,2] 龙大彬 肖铁光[2] 

机构地区：[1]湖南人文科技学院生命科学系,娄底417000 [2]湖南农业大学植物保护学院,长沙410128 [3]湖南省烟草公司长沙市公司浏阳分公司,浏阳410300

出　　处：《应用昆虫学报》2013年第4期959-966,共8页Chinese Journal of Applied Entomology

基　　金：国家科技支撑计划项目(2012BAD19B05);湖南省教育厅重点项目(11A059)

摘　　要：本文以蚜茧蜂Lysiphlebia japonica Ashmead与棉蚜Aphis gossypii Glover系统为研究对象,以内禀增长率r m作为适合度指标,通过开顶式动态CO2气室(OTC),重点比较了目前大气CO2浓度与未来加倍的大气CO2浓度下(375μL/L VS 750μL/L)直接放入蚜茧蜂、笼罩间接放入蚜茧蜂的胁迫作用对不同世代和3个连续世代棉蚜适合度的影响。结果表明:CO2浓度变化、世代之间、寄生胁迫方式对棉蚜净繁殖率R0、平均世代时间T和内禀增长率r m均存在着极显著的影响;CO2浓度变化和寄生胁迫方式之间、CO2浓度变化和棉蚜发生世代之间的交互作用对棉蚜净繁殖率R0和内禀增长率r m也存在着极显著的影响。结果提示:大气CO2浓度将通过影响寄生蜂的间接干扰作用,从而影响棉蚜的适合度和种群动态,使棉蚜种群有下降的趋势。The effects of two levels of CO2 （ 375 μL/L VS 750μL/L） on the cotton - Aphis gossypii - Lysiphlebia japonica system were studied using OTCs. We evaluated the influence of direct and indirect stress from L. japonica on the fitness response of aphids to changing CO2 for three successive generations. We wished to show whether CO2 levels, generation and L. japonica-stress markedly determined the fecundity, net reproduction, mean generation time and intrinsic rate of increase in cotton aphids, and whether interactions between these variables also had a notable impact on the fecundity, net reproduction, and intrinsic rate of increase of aphids. Our results suggest that the stress induced by exposure to caged L. japonica had greater impact on the fitness and population dynamics of successive generations of A. gossypii under elevated CO2 , resulting in a lower aphid-population.

关 键 词：棉蚜 蚜茧蜂 CO2浓度 适合度 胁迫作用 3个连续世代 

分 类 号：S435.622[农业科学—农业昆虫与害虫防治] S476.3[农业科学—植物保护]