斑痣悬茧蜂在黏虫寄主体内与中红侧沟茧蜂竞争下的存活和发育表现  

Survival and developmental performance of Meteorus pulchricornis in intrinsic competition with Microplitis mediator within the shared host Mythimna separata( Lepidoptera: Noctuidae)

作　　者：徐宇航[1] 周金成[1] 李保平[1] 孟玲[1] 

机构地区：[1]南京农业大学植物保护学院,农作物生物灾害综合治理教育部重点实验室,南京210095

出　　处：《昆虫学报》2016年第3期322-327,共6页Acta Entomologica Sinica

基　　金：国家自然科学基金项目(31570389);国家公益性行业(农业)科研专项(201103002)

摘　　要：【目的】不同种寄生蜂在同一小生境中可能寄生同一共享寄主。本研究旨在为认识寄生蜂种间互作关系,并为科学评价寄生性天敌控害效应提供依据。【方法】在室内以单寄生性斑痣悬茧蜂Meteorus pulchricornis(Wesmael)和中红侧沟茧蜂Microplitis mediator(Halidy)及其寄主黏虫Mythimna separata(Walker)低龄幼虫为材料,以寄生顺序和间隔时间为因素进行种间寄生竞争效应实验,观察比较两种蜂的存活和斑痣悬茧蜂子代的发育历期、体型大小和寿命等发育参数。【结果】不同寄生顺序和间隔时间组合处理下斑痣悬茧蜂子代蜂存活率始终高于中红侧沟茧蜂,且先寄生的斑痣悬茧蜂子代存活率高于后寄生的蜂,提前24 h寄生的斑痣悬茧蜂子代存活率可高达96.7%。当斑痣悬茧蜂先于中红侧沟茧蜂寄生时,其子代幼虫发育历期比单独寄生(对照)时显著延长;当后于中红侧沟茧蜂寄生时,其子代幼虫发育历期与单独寄生时无显著差异。各竞争处理下,斑痣悬茧蜂子代成虫寿命均长于单独寄生的子代成虫;子代成虫后足胫节长度与单独寄生相比明显缩短。【结论】结果说明,斑痣悬茧蜂在黏虫低龄幼虫体内与中红侧沟茧蜂的竞争中占有优势,但竞争对斑痣悬茧蜂子代生长发育具有负面影响。【Aim】Different parasitoid species may parasitize a shared host in the same microhabitat. This study aims at understanding the intrinsic competition between parasitoids and providing data for evaluating the control effects of parasitoids in biological control. 【Methods】We manipulated parasiting sequence and time interval of two solitary parasitoids,Meteorus pulchricornis（ Wesmael） and Microplitis mediator（ Haliday） that attacked larvae of the shared host Mythimna separata（ Walker）. Survival of the two parasitoids in intrinsic competition and developmental parameters of M. pulchricornis were investigated and compared. 【Results】M. pulchricornis offspring had higher survival rates than M. mediator in the competition under treatments with different combinations of parasitizing sequence and time intervals,reaching as high as 96. 7% when parasitizing 24 h earlier. M. pulchricornis prolonged the larval duration when parasitizing hosts ahead of M. mediator compared to that when parasitizing alone（ the control）,but did not differ from the control when parasitizing after M. mediator. M. pulchricornis offspring adults lived longer under each competition treatment than under the control. The adult size（ measured by hind tibia length） of M. pulchricornis offspring was significantly smaller under each competition treatment than under the control. 【Conclusion】The results of this study suggest that M. pulchricornis outcompetes M. mediator in shared M. separata early instar larva hosts,but incurs negative impacts on its offspring development.

关 键 词：斑痣悬茧蜂 中红侧沟茧蜂 种间竞争 体内竞争 多寄生 生活史特征 

分 类 号：Q968[生物学—昆虫学]