Examining the associations between a generalist feeder and a highly toxic host
Examining the associations between a generalist feeder and a highly toxic host
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DOI：
10.1002/ece3.11035
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发表时间：
2024-02-01
影响因子：
2.6
通讯作者：
Chialvo，Clare H. Scott
中科院分区：
文献类型：
--
作者：
Kropelin，Grace;Chialvo，Clare H. Scott
了解经常相互对抗的植物-食草动物的相互作用以及宿主防御如何影响食草动物的饮食广度是生态学和进化生物学正在进行的研究领域。通常情况下，产生剧毒化学防御系统的寄主植物/真菌只能由专家提供食物。我们对可以在有害宿主上捕食和发育的多面手物种知之甚少。多面手以有毒宿主为食的一个例子发生在移民中以蘑菇为食的果蝇--三点放射疗法。虽然这些物种被归类为多面手，但它们可接受的宿主包括致命的鹅膏菌属种。在这项研究中，我们使用行为分析来评估一种以蘑菇为食的物种--果蝇和致命的鹅膏菌之间的联系。我们进行了喂养试验以确认环肽毒素耐受性的存在。然后，我们完成了对雌蝇和幼虫的寄主偏好分析，没有发现它们对有毒蘑菇的偏好。最后，我们评估了竞争对产卵偏好的影响。我们发现，在首选寄主上出现竞争对手的卵与苍蝇增加在有毒蘑菇上产卵的数量有关。我们的结果突出表明，获得低竞争宿主资源可能有助于维持多面手物种和剧毒宿主之间的联系。
Understanding the often antagonistic plant–herbivore interactions and how host defenses can influence herbivore dietary breadth is an area of ongoing study in ecology and evolutionary biology. Typically, host plants/fungi that produce highly noxious chemical defenses are only fed on by specialists. We know very little about generalist species that can feed and develop on a noxious host. One such example of generalists feeding on toxic host occurs in the mushroom‐feedingDrosophilafound in theimmigrans‐tripunctataradiation. Although these species are classified as generalists, their acceptable hosts include deadlyAmanitaspecies. In this study, we used behavioral assays to assess associations between one mushroom‐feeding species,Drosophila guttifera, and the deadlyAmanita phalloides. We conducted feeding assays to confirm the presence of cyclopeptide toxin tolerance. We then completed host preference assays in female flies and larvae and did not find a preference for toxic mushrooms in either. Finally, we assessed the effect of competition on oviposition preference. We found that the presence of a competitor's eggs on the preferred host was associated with the flies increasing the number of eggs laid on the toxic mushrooms. Our results highlight how access to a low competition host resource may help to maintain associations between a generalist species and a highly toxic host.