Data from: Different diversification rates between sexual and asexual organisms

Patterns of diversity reflect the balance between speciation and extinction over time. Here we estimate net diversification rates for samples of sexual and asexual rotifers using phylogenetic reconstructions from sequence data of one mtDNA locus, cytochrome oxidase c subunit I. All four clades of bdelloid rotifers, obligate asexuals, had higher number of species per clade and significantly higher accumulation of diversification events towards the root of the trees than the four clades of their sexual relatives, the monogonont rotifers. Such differences were robust to confounding effects of number of analysed sequences, haplotype diversity, overall genetic divergence or age of the clades. Our results support the idea that differences in diversification rates could thus be ascribed to different mechanisms of speciation, with ecological speciation as the most plausible mechanism for asexual organisms.生物多样性模式反映了随时间推移物种形成与灭绝之间的动态平衡。本研究基于单个线粒体DNA（mtDNA）位点——细胞色素c氧化酶亚基I（cytochrome oxidase c subunit I）的序列数据进行系统发育重建，以此估算有性与无性轮虫样本的净多样化速率（net diversification rates）。所有4个蛭形轮虫（bdelloid rotifers，专性无性生殖类群）分支的单分支物种数量均高于其有性近缘类群——单巢目轮虫（monogonont rotifers）的4个分支，且其系统发育树基部附近的多样化事件积累量显著更高。此类差异不受分析序列数量、单倍型多样性（haplotype diversity）、整体遗传分化或类群起源年代等混杂效应的干扰，结果稳健。本研究结果支持如下观点：多样化速率的差异可归因于不同的物种形成机制，其中生态物种形成是无性生殖生物最具合理性的物种形成机制。