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可疑柄瘤蚜茧蜂对高温下不同龄期黑豆蚜的寄生及其适合度表现
引用本文:徐清华,孟玲,李保平.可疑柄瘤蚜茧蜂对高温下不同龄期黑豆蚜的寄生及其适合度表现[J].昆虫学报,2007,50(5):488-493.
作者姓名:徐清华  孟玲  李保平
作者单位:(南京农业大学昆虫学系,农业部病虫监测与治理重点开放实验室,南京 210095)
摘    要:研究寄生蜂对寄主不同龄期的寄生策略通常采用适温下(≈25℃)培养的寄主进行试验。 为探究蚜茧蜂对高温下生长的寄主蚜虫的寄生反应及其适合度表现,在30℃条件下饲养寄主孤雌胎生无翅黑豆蚜Aphis fabae Scopli,获得不同龄期若蚜和刚羽化的成蚜,分别提供给可疑柄瘤蚜茧蜂Lysiphlebus ambiguous Haliday寄生,观察蚜茧蜂的寄生率以及后代性比、体型大小和发育时间等适合度相关特性。结果表明: 可疑柄瘤蚜茧蜂对1至4龄若蚜及成蚜均寄生,但偏向寄生较早龄期的若蚜,对成蚜的寄生率为28.0%,显著低于对1龄(400%)和2龄(42.8%)寄主若蚜的寄生率。后代雌蜂比例和体型随寄主龄期(体型)增大而减小,而发育历期则呈现“中间低,两头高”的格局。后代性比、体型大小及发育历期等适合度表现与此前适温(≈25℃)下得到的结果截然相反。因此推测,寄主黑豆蚜体型或龄期可能不是或不全部是可疑柄瘤蚜茧蜂评价寄主质量的依据,其他与寄主蚜虫内共生菌动态相关的线索(如行为的,化学的等)可能才是其评价寄主质量的依据。

关 键 词:可疑柄瘤蚜茧蜂  黑豆蚜  寄主龄期选择  适合度  布赫  
文章编号:0454-6296(2007)05-0488.06
收稿时间:2006-09-20
修稿时间:2007-04-11

Parasitism and fitness-related performances of Lysiphlebus ambiguus Haliday (Hymenoptera: Braconidae) in different instars of the host Aphis fabae reared at high temperature
XU Qing-Hua,MENG Ling,LI Bao-Ping.Parasitism and fitness-related performances of Lysiphlebus ambiguus Haliday (Hymenoptera: Braconidae) in different instars of the host Aphis fabae reared at high temperature[J].Acta Entomologica Sinica,2007,50(5):488-493.
Authors:XU Qing-Hua  MENG Ling  LI Bao-Ping
Institution:(Key Laboratory of Monitoring and Management of Plant Diseases and Insect Pests of the Ministry of Agriculture of China, Department of Entomology, Nanjing Agricultural University, Nanjing 210095, China)
Abstract:Prevalent experiments to investigate the host-stage selection of parasitoids manipulate host cohorts at the optimal temperature (≈25℃). To explore the oviposition strategy and fitness-related performances of parasitoids in different host instars, the black bean aphid, Aphis fabae Scopli was cultured at 30℃ to obtain cohorts of different instars and adults and then exposed to parasitism of Lysiphlebus ambiguous (Haliday). The parasitism and fitness-related performances were recorded including parasitization rate, emergence rate, sex ratio, body size, and development time. The results indicated that the aphid parasitoid attacked more young aphids than the old, even though the 1st through the 4th instar nymphs and eclosing adults were all susceptible to parasitism. The parasitism rate on the adult aphid (28.0%) was significantly lower than on the 1st instar nymph (40.0%) and the 2nd instar nymph (42.8%). The proportion of female progeny and emerging adult size of the offspring parasitoid declined with the increase of aphid instars (and body sizes) at parasitism, but the development time remained constant, which contrasted with fitness performances of the parasitoid attacking the host reared at the optimal temperature. It was argued that L. ambiguous may not or may not always base the host value on body size and instar of the host, and other clues (e.g. behavioral, chemical etc.) associated with dynamics of endosymbiotic bacteria in the host aphid should be considered.
Keywords:Lysiphlebus ambiguus  Aphis fabae  host-stage selection  fitness  Buchnera  endosymbiosis
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