Mate Discrimination of Colocasiomyia xenalocasiae and C. alocasiae (Diptera: Drosophilidae) as a Possible Factor Contributing to their Co-Existence on the Same Host Plant
Mate Discrimination of Colocasiomyia xenalocasiae and C. alocasiae (Diptera: Drosophilidae) as a Possible Factor Contributing to their Co-Existence on the Same Host Plant
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DOI：
10.1007/s10905-022-09798-0
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发表时间：
2022-06
影响因子：
1
通讯作者：
R. Tanaka;Hiroki Takekata;Yuki Ishikawa;Azusa Kamikouchi
中科院分区：
文献类型：
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作者：
R. Tanaka;Hiroki Takekata;Yuki Ishikawa;Azusa Kamikouchi
配偶歧视通过降低种间交配的风险来促进相关物种的共存。在传粉者利用寄主植物作为交配场所的授粉互惠系统中，与其他相关物种共享寄主植物可能会增加非适应性种间交配。尽管这些共享宿主的物种预计具有强大的交配辨别系统，但人们对它们是否以及如何区分交配物种知之甚少。在这里，我们研究了两种蝇类（Colocasiomyia xenalocasiae 和 C. alocasiae（双翅目：果蝇科），共享寄主植物；它们本质上是嗜人性的，在整个生命周期中完全依赖于特定的天南星寄主植物。我们的实地观察表明，C. 的雄性。海芋和C. Xenalocasia 优先与同种雌性配对，但不与异种雌性配对。这表明它们在自然栖息地中会区分交配物种。在实验室条件下也观察到了这种择偶歧视。为了研究这些果蝇如何区分物种，我们定义了两个物种求偶序列中不同的行为要素，并比较了同种和异种对之间每个元素的性相互作用。我们发现雄性在拍打时会歧视雌性，而雌性会在雄性尝试骑乘之前或期间歧视雄性。这表明男性和女性的择偶系统都降低了异种繁殖的发生率。安装是成功交配求爱序列中的必要步骤。本研究中发现的配偶歧视系统可能允许 C 共存。 Xenalocasiae 和 C.通过有效抑制种间交配，在同一寄主植物上进行定位。
Mate discrimination contributes to the co-existence of related species by reducing the risk of interspecific copulation. In pollination mutualistic systems where pollinators utilize host plants as mating places, sharing of host plants with other related species could increase non-adaptive interspecific copulation. Although such host-sharing species are expected to have strong mate discrimination systems, little is known about whether and how they discriminate species for mating. Here, we investigate mate discrimination of two fly species,Colocasiomyia xenalocasiaeandC. alocasiae(Diptera: Drosophilidae), which share host plants; they are essentially anthophilous, depending exclusively on specific aroid host plants throughout their entire life cycles. Our field observations showed that the males ofC. alocasiaeandC. xenalocasiaepreferentially paired with conspecific, but not heterospecific, females. This indicates that they discriminate species for mating in the natural habitat. Such mate discrimination was also observed under laboratory conditions. To investigate how these flies discriminate species, we defined distinct behavioral elements in courtship sequence in both species, and compared sexual interactions in each element between conspecific and heterospecific pairs. We found that males discriminate female whilst tapping, whereas females discriminate male before or during males’ attempted mounting. This suggests that mate discrimination systems in both males and females reduce the incidence of heterospecific mounting; mounting is a necessary step in the sequence of courtship for successful copulation. The mate discrimination system found in this study potentially allows for the co-existence ofC. xenalocasiaeandC. alocasiaeon the same host plant by effectively suppressing interspecific copulation.