Seasonal cues mediate host behaviour modification and cocoon polymorphism in Microplitis mediator (Hymenoptera: Braconidae)

文献类型： 外文期刊

第一作者： Zhang, Jing

作者： Zhang, Jing;Liu, Xiao-Xia;Zhang, Qing-Wen;Michaud, J. P.;Li, Jian-Cheng;Luo, Shu-Ping

作者机构：

关键词： Hymenoptera;Braconidae;Microplitis mediator;Lepidoptera;Noctuidae;Mythimna separata;photoperiod;host behaviour;pupation site selection;cocoon polymorphism;temperature

期刊名称：EUROPEAN JOURNAL OF ENTOMOLOGY （ 影响因子：1.225； 五年影响因子：1.548 ）

ISSN：

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收录情况： SCI

摘要： Laboratory experiments were conducted to examine the effects of photoperiod and temperature on the pupation behaviour of the parasitoid, Microplitis mediator (Haliday) (Hymenoptera: Braconidae), parasitizing larvae of Mythimna separata Walker (Lepidoptera: Noctuidae). A combination of long photoperiod (14 + h L) and warm temperatures (20-24°C) caused parasitized caterpillars to climb to upper plant parts where the parasitoid produced a green, non-diapausing cocoon on a green leaf, initially retaining the dying caterpillar host as a protective covering. In contrast, short photoperiod (8-10 h L) and low temperature (16-18°C) induced host caterpillars to descend the plant where the parasitoid produced a brown, diapausing cocoon either hanging by silkfrom a senescing leaf or simply lying on the soil, but without any continued association with the host. These findings illustrate the potential for seasonal environmental cues to simultaneously mediate diapause induction, cocoon polymorphism, and alternate forms of host behaviour modification in a hymenopterous parasitoid.

分类号： Q96

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