Phylogenetic analysis of the winter geometrid genus Inurois reveals repeated reproductive season shifts
Phylogenetic analysis of the winter geometrid genus Inurois reveals repeated reproductive season shifts
复制标题
冬季尺蠖属 Inurois 的系统发育分析揭示了重复的繁殖季节变化
DOI：
10.1016/j.ympev.2015.08.016
复制
发表时间：
2016
影响因子：
4.1
通讯作者：
Teiji Sota
中科院分区：
文献类型：
--
作者：
Satoshi Yamamoto;Eugene A. Beljaev;Teiji Sota
属于 Inurois 属的冬尺蛾包括 9 个在初冬繁殖的物种、3 个在晚冬繁殖的物种，以及在早冬和晚冬种群遗传上存在差异的多态物种，这些多态物种在该物种的范围内广泛共存。在我们之前的研究中，我们证明了生殖时间的差异导致了同域种群之间的异时生殖隔离。在本研究中，为了评估属内生殖时间的进化模式，我们使用核和线粒体基因序列确定了物种之间的系统发育关系。核基因树显示，13 个分歧事件中有 4 个独立发生繁殖季节变化。在两次分歧事件中，异时姐妹谱系在同源中形成，表明繁殖季节的分离与Inurois属的多样化有关。我们还发现线粒体基因树与核基因树有很大不同，并且在少数情况下可能发生线粒体渗入。尽管尚不清楚早冬和晚冬物种是否确实相互杂交，以及生殖季节隔离提供的生殖隔离有多强或稳定，但我们的研究阐明了异时隔离在Inurois属多样化过程中的潜在重要性。
Winter geometrid moths belonging to the genusInuroiscomprise nine species that reproduce during early winter, three species that reproduce in late winter, and polymorphic species with genetically diverged early and late winter populations that co-occur widely across the species’ range. In our previous studies, we demonstrated that differences in reproductive timing resulted in allochronic reproductive isolation between sympatric populations. In the present study, to assess the evolutionary pattern of reproductive timing within the genus, we determined the phylogenetic relationships among species using nuclear and mitochondrial gene sequences. Nuclear gene tree showed that reproductive season shifts occurred independently in four of 13 divergence events. In two divergence events, allochronic sister lineages were formed in sympatry, suggesting that the segregation of the reproductive season was associated with diversification in the genusInurois. We also found that the mitochondrial gene tree was quite different from the nuclear gene tree and that mitochondrial introgression may have occurred in a few cases. Although it remains unclear whether early and late winter species actually have hybridized with each other and how strong or stable is the reproductive isolation provided by the reproductive season segregation, our study illuminates the potential importance of allochronic isolation in the diversification process of the genusInurois.