余海芳,白素芬,李欣,何璠

• 1:河南农业大学植物保护学院

摘要(Abstract)：

在室内,以小菜蛾3龄幼虫为寄主,对过寄生后,小菜蛾重要内寄生蜂——半闭弯尾姬蜂的种内竞争进行了研究.当2头雌蜂同时寄生(10 min内)同1头小菜蛾,几乎同时孵化的姬蜂幼虫间总是先发现对手的1龄幼虫抢先利用角质化上颚将其他竞争者攻击致死.当2次寄生时间间隔为24,48,72,96 h时,多以先寄生的姬蜂幼虫在发育上占据优势,它通过物理攻击将后产的初孵幼虫杀死,或直接攻击蜂卵致使包囊、黑化的发生,并可通过生理抑制完全阻碍后产蜂卵的发育.当2次寄生间隔时间长达120 h,后孵化的姬蜂1龄幼虫可通过上颚将先寄生的已发育为末龄的无上颚的姬蜂幼虫致伤或杀死.研究结果表明,当种内竞争发生时,半闭弯尾姬蜂可通过物理攻击和生理抑制2种途径将同类竞争者排除.竞争结果与雌蜂2次寄生的时间间隔有关.

关键词(KeyWords)： 种内竞争;过寄生;半闭弯尾姬蜂;小菜蛾

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(30471168)

作者(Author): 余海芳,白素芬,李欣,何璠

DOI: 10.16445/j.cnki.1000-2340.2010.04.008

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