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Chemical cues from competitors change the oviposition preference of Drosophila suzukii
Entomologia Experimentalis et Applicata ( IF 1.9 ) Pub Date : 2020-03-20 , DOI: 10.1111/eea.12889
Hiroaki Kidera 1 , Kazuo H. Takahashi 1
Affiliation  

Although Drosophila suzukii Matsumura (Diptera: Drosophilidae) infests fresh and ripening fruits, it is attracted to fermented fruits as well. Because fermented fruits attract other flies too, if D. suzukii utilizes fermented fruits as oviposition substrates, competition can be more intense on them. To avoid such competition, D. suzukii may change oviposition preference when particular species of competitor flies are present, but the effect of odor cues associated with competitors on the oviposition preference of D. suzukii is still unknown. To examine such an effect, we investigated the oviposition preference of D. suzukii in the presence of four competitor fly species – Drosophila melanogaster Meigen, Drosophila lutescens Malloch, Drosophila rufa Kikkawa & Peng, and Drosophila auraria Peng – and D. suzukii itself. We prepared artificial substrates with yeast treatment (Y+: yeast supplementation, Y−: control) and competitor fly treatment (F+: pre‐inoculated with competitor fly odor, F−: control), and performed two‐choice experiments using the substrates with various Y and F treatments. Our results showed that D. suzukii oviposited more eggs on Y+ substrates than on Y− substrates when no competitor flies were present and the presence of competitor flies influenced D. suzukii’s oviposition preference for yeast‐supplemented substrates and its effect changed depending on the competitor fly species. If the presence of competitors around fallen fruits on the ground suppresses D. suzukii’s oviposition on the fallen fruits and facilitates the oviposition on non‐fermenting substrates in nature, it may drive D. suzukii to use ripening fruits on the tree. Such selective pressure may facilitate the evolution of morphological traits such as a serrated ovipositor in D. suzukii.

中文翻译:

来自竞争对手的化学线索改变了铃木果蝇的产卵偏好

虽然 Drosophila suzukii Matsumura(双翅目:果蝇科)侵扰新鲜和成熟的水果,但它也被发酵的水果所吸引。因为发酵果实也会吸引其他果蝇,如果 D. suzukii 利用发酵果实作为产卵基质,它们之间的竞争会更加激烈。为了避免这种竞争,当存在特定种类的竞争对手苍蝇时,铃木 D. suzukii 可能会改变产卵偏好,但与竞争对手相关的气味线索对 D. suzukii 产卵偏好的影响仍然未知。为了检查这种效果,我们研究了 D. suzukii 在存在四种竞争果蝇的情况下的产卵偏好 - Drosophila melanogaster Meigen、Drosophila lutescens Malloch、Drosophila rufa Kikkawa & Peng 和 Drosophila auraria Peng - 以及 D. suzukii 本身。我们制备了酵母处理(Y+:酵母补充,Y-:对照)和竞争果蝇处理(F+:预先接种竞争果蝇气味,F-:对照)的人工底物,并使用具有各种Y 和 F 处理。我们的结果表明,当没有竞争果蝇存在且竞争果蝇的存在影响 D. suzukii 对酵母补充底物的产卵偏好时,D. suzukii 在 Y+ 底物上比在 Y- 底物上产卵更多的卵子,其效果因竞争果蝇而异物种。如果地面上落果周围的竞争者的存在抑制了 D. suzukii 在落果上的产卵并促进了在自然界中非发酵基质上的产卵,它可能会驱使 D. suzukii 在树上使用成熟的果实。
更新日期:2020-03-20
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