布氏潜蝇茧蜂与长尾潜蝇茧蜂的种间竞争

Interspecific competition between Fopius vandenboschi and Diachasmimorpha longicaudata in Bactrocera dorsalis larvae

在室内研究了布氏潜蝇茧蜂和长尾潜蝇茧蜂的种间竞争。结果表明,当寄主橘小实蝇幼虫供两种蜂同时产卵寄生时,2种蜂的各自寄生率与其单独存在时的寄生率相比无显著差异,2种蜂共存时的总寄生率比长尾潜蝇茧蜂单独存在时的寄生率显著提高,与布氏潜蝇茧蜂单独寄生相比无差异。2种蜂均能寄生已被另一种蜂产卵寄生的寄主幼虫。长尾潜蝇茧蜂寄生后0、24、48 h再供布氏潜蝇茧蜂寄生,2种蜂后代个体在寄主体内发育过程中,布氏潜蝇茧蜂数量逐渐减少,长尾潜蝇茧蜂数量无变化。布氏潜蝇茧蜂寄生后24或48 h后再供长尾潜蝇茧蜂寄生,长尾潜蝇茧蜂个体比例逐渐下降,而布氏潜蝇茧蜂没有变化。

Interspecific competition between Fopius vandenboschi(Fullaway) and Diachasmimorpha longicaudata(Shmead) were studied in the laboratory.When Bactrocera dorsalis(Hendel) larvae were exposed to both parasitoids concurrently,parasitism rates of host by F.vandenboschi or by D.longicaudata were not significantly different from those when the host larvae were exposed to one parasitoid of the two species at a time;the joint parasitism rate by the two parasitoids was significantly higher than those by D.longicaudat...