How does the ectoparasitoid wasp Euplectrus separatae (Hymenoptera : Eulophidae) recognize a suitable oviposition site on the host larva Pseudaletia separata (Lepidoptera : Noctuidae)?
How does the ectoparasitoid wasp Euplectrus separatae (Hymenoptera : Eulophidae) recognize a suitable oviposition site on the host larva Pseudaletia separata (Lepidoptera : Noctuidae)?
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DOI：
10.1303/aez.2005.185
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发表时间：
2005-02
影响因子：
1.3
通讯作者：
Y. Nakamatsu;Toshiharu Tanaka
中科院分区：
文献类型：
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作者：
Y. Nakamatsu;Toshiharu Tanaka
粘虫的幼虫寄生于寄主第3胸节至第2腹节的背外侧表面。摘要寄生蜂幼虫在试图寄生寄主时，往往会受到攻击性防御行为的威胁。E.分开的雌性在产卵前刺入寄主以注入毒液。在这个时候，雌性黄蜂暴露在一个严重的风险，从侵略性的主机行为。然而，雌性通过移动到宿主的特定部分来避免风险。问题是雌蜂如何识别寄主的特定部分。雌蜂从寄主的后背部爬上寄主幼虫，并在寄主上向前移动。雌性利用化学线索来识别宿主身体的后部。乙醚提取物从最后的腹部节的主机更吸引女性比提取物从头部。雌蜂上蜂后寄主的静止行为并不能诱导雌蜂向前移动。一旦雌性在宿主身上，她就利用宿主身体的爬行（蠕动运动）作为刺激在宿主身上向前移动。另一个关键的刺激，使寄生蜂停止前进的特定部分的主机进行了检查。当一个主机头连接到第3腹节，雌蜂的产卵地点充分移动后的主机上的头，这表明头是作为一个视觉线索，以查明一个合适的产卵地点。
The larval ectoparasitoid of Pseudaletia separata, Euplectrus separatae oviposits exclusively on the dorsolateral surface from the 3rd thoracic to the 2nd abdominal segment of the host. Larval parasitoids are well known to be exposed to risks from aggressive defense behavior when they attempt to parasitize a host. E. separatae female sting the host to inject a venom prior to oviposition. At this time the female wasp is exposed to a serious risk from aggressive host behavior. However, the female avoids the risk by moving to a specific segment of the host. The question arose as to how the female wasp recognizes the specific segments of the host. The female wasp mounted the host larva from the posterior dorsal part and moved forward on the host. The female used chemical cues to recognize the posterior part of the host body. Diethyl ether extracts from the last abdominal segments of the host were more attractive to females than extracts from the head. Motionless behavior in the host after the female wasp mounted did not induce the forward movement of the female wasp. Once the female was on the host she used crawling of the host body (peristaltic movement) as a stimulus to move forward on the host. Another key stimulus to cause the parasitoid to cease movement forward on the specific segments of the host was examined. When a host head was attached to the 3rd abdominal segment, the female wasp shifted the oviposition site adequately behind the head on the host body, suggesting that the head is used as a visual cue to pinpoint a suitable oviposition site.