Christiana P. Huss, Jonathan E. Golan, Carmen K. Blubaugh
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引用次数: 0
摘要
食草昆虫通常会选择能优化其生长的寄主植物。然而，许多专性食草昆虫会选择化学防卫性强、生长速度慢的寄主植物，优先保护自己不受天敌侵害。入侵的专性食草昆虫在其非原生地可能具有额外的优势，因为在那里它们缺乏共同进化的专性天敌，此外，它们对通性捕食者来说也不可口。在这里，我们探讨了外来入侵的黄缘叶甲--Microtheca ochroloma和本地天敌的食性偏好。我们测量了六种不同葡萄糖苷酸浓度的甘蓝栽培品种对 M. ochroloma 的偏好。在田间和实验室实验中，赭叶小蠹都偏好防御性相对较弱的寄主植物--水菜和大白菜。M. ochroloma在水菜上生长最快。在选择性试验中，食肉性昆虫也更喜欢吃喂食过水葫芦的赭尾蝉幼虫，但在野外，食肉性昆虫在水葫芦上最不常见，而在以本地食草动物为主的植物上最常见。M.ochroloma食用的植物会增加其对捕食者的易感性，但在田间捕食压力似乎普遍较低。我们的研究结果表明，入侵的专性食草动物可能会优先考虑生长，而不是抵御天敌。专性食草动物入侵者自上而下的调控能力较弱，这可能使它们能够在其新的分布区利用防御能力较弱的寄主植物，从而加快生长速度并加剧作物损害。在诱捕作物系统中，利用植物对新寄主范围的偏好，可以更有效地管理入侵害虫。
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Ecological Entomology publishes top-quality original research on the ecology of insects and related invertebrate taxa. Our aim is to publish papers that will be of considerable interest to the wide community of ecologists who are motivated by ecological or evolutionary theory. The suitability of a manuscript will usually be assessed within 5 days.
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