Interspecific competition between the ichneumonid Campoletis chlorideae and the braconid Microplitis mediator in their host Helicoverpa armigera
Interspecific competition between the ichneumonid Campoletis chlorideae and the braconid Microplitis mediator in their host Helicoverpa armigera
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DOI：
10.1111/j.1570-7458.2008.00668.x
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发表时间：
2008-04-01
影响因子：
1.9
通讯作者：
Wang, Chen-Zhu
中科院分区：
文献类型：
--
作者：
Tian, Shen-Peng;Zhang, Ji-Hong;Wang, Chen-Zhu
在实验室条件下，研究了棉铃虫棉铃虫Campoletis chlorideae Uchida(膜翅目：姬蜂科)和Micropltis mediator(Haliday)(膜翅目：茧蜂科)在棉铃虫Helicoverpa armigera(Hubner)(鳞翅目：夜蛾科)体内的种间竞争。棉铃虫幼虫被两种蜂同时寄生或以不同的时间间隔顺序寄生。当寄主幼虫同时被两种寄生蜂寄生时，产茧量多为中蜂。当寄主幼虫在12或24 h时，寄生寄主的寄生蜂主要是中星天牛。当寄主幼虫最初被寄生寄生时，12或24 h后再寄生媒介寄主，从寄生寄主中排出的寄生蜂主要是寄主寄生的寄主。在寄生后不同时间对寄主幼虫进行解剖，结果表明，中星天牛一龄幼虫对氯化小蜂幼虫有物理攻击作用，但对氯化小蜂幼虫的卵无攻击作用。当同一寄主依次被两种黄蜂寄生时，与只寄生一种黄蜂相比，更多的寄主幼虫死亡，子代数量显著减少。相反，在同时寄生的情况下，寄主死亡率和产卵量与单种寄生的差异不显著。
We investigated interspecific competition between Campoletis chlorideae Uchida (Hymenoptera: Ichneumonidae) and Microplitis mediator (Haliday) (Hymenoptera: Braconidae) in their host, the cotton bollworm, Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae) under laboratory conditions. Cotton bollworm larvae were allowed to be parasitized by both wasp species simultaneously or sequentially at different time intervals. When host larvae were parasitized simultaneously by both parasitoids, the majority of the cocoons produced were of M. mediator. When host larvae were parasitized initially by M. mediator followed by C. chlorideae at 12 or 24 h, parasitoids emerging from the multiparasitized hosts were mainly M. mediator. In contrast, when host larvae were parasitized initially by C. chlorideae, followed by M. mediator 12 or 24 h later, parasitoids emerging from the multiparasitized hosts were mainly C. chlorideae. Dissections of host larvae at various time intervals after parasitization by the two parasitoids showed that first instars of M. mediator could physically attack the larvae of C. chlorideae, but not the eggs of C. chlorideae. When a host was parasitized by both wasp species sequentially, more host larvae died and the number of wasp offspring was significantly reduced compared to a host parasitized by only one wasp. Conversely, in simultaneous multiparasitism, the host mortality and wasp offspring production were not significantly different from those parasitized by single wasp species.