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A morphological trait involved in reproductive isolation between Drosophila sister species is sensitive to temperature
Ecology and Evolution ( IF 2.6 ) Pub Date : 2021-05-25 , DOI: 10.1002/ece3.7580
Alexandre E Peluffo 1 , Mehdi Hamdani 1 , Alejandra Vargas-Valderrama 1 , Jean R David 2, 3 , François Mallard 4 , François Graner 5 , Virginie Courtier-Orgogozo 1
Affiliation  

Male genitalia are usually extremely divergent between closely related species, but relatively constant within one species. Here we examine the effect of temperature on the shape of the ventral branches, a male genital structure involved in reproductive isolation, in the sister species Drosophila santomea and Drosophila yakuba. We designed a semi-automatic measurement machine learning pipeline that can reliably identify curvatures and landmarks based on manually digitized contours of the ventral branches. With this method, we observed that temperature does not affect ventral branches in D. yakuba but that in D. santomea ventral branches tend to morph into a D. yakuba-like shape at lower temperature. We found that male genitalia structures involved in reproductive isolation can be relatively variable within one species and can resemble the shape of closely related species’ genitalia through plasticity to temperature. Our results suggest that reproductive isolation mechanisms can be dependent on the environmental context.

中文翻译:

果蝇姐妹物种之间生殖隔离所涉及的形态特征对温度敏感

雄性生殖器在密切相关的物种之间通常极为不同,但在一个物种内相对恒定。在这里,我们研究了温度对姐妹物种Drosophila santomeaDrosophila yakuba 中腹侧分支形状的影响,腹侧分支是参与生殖隔离的雄性生殖器结构。我们设计了一种半自动测量机器学习管道,可以根据腹侧分支的手动数字化轮廓可靠地识别曲率和地标。使用这种方法,我们观察到温度不会影响D. yakuba 的腹侧分支,但D. santomea 的腹侧分支倾向于变形为D. yakuba- 在较低温度下的形状。我们发现,涉及生殖隔离的雄性生殖器结构在一个物种内可能相对可变,并且可以通过对温度的可塑性与密切相关物种的生殖器形状相似。我们的研究结果表明,生殖隔离机制可能取决于环境背景。
更新日期:2021-06-22
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