Transoceanic Dispersal and Plate Tectonics Shaped Global Cockroach Distributions: Evidence from Mitochondrial Phylogenomics
Transoceanic Dispersal and Plate Tectonics Shaped Global Cockroach Distributions: Evidence from Mitochondrial Phylogenomics
复制标题
跨洋扩散和板块构造塑造了全球蟑螂分布：来自线粒体系统发育学的证据
DOI：
10.1093/molbev/msy013
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发表时间：
2018-04-01
影响因子：
10.7
通讯作者：
Lo, Nathan
中科院分区：
文献类型：
--
作者：
Bourguignon, Thomas;Tang, Qian;Lo, Nathan
随着世纪后半叶板块构造理论的接受，地理分隔成为许多植物和动物群体分布的主要解释。然而，近年来，分子钟分析对一些广为接受的邻近假说提出了挑战。作为一个广泛分布的昆虫群，其化石记录可以追溯到300 My，蟑螂提供了一个理想的模型，用于测试通过板块构造与跨洋传播的邻近假说。然而，他们的进化历史仍然知之甚少，部分原因是九个公认的家庭之间的关系尚未解决。在这里，我们提出了一个系统发育的估计，所有现存的蟑螂家庭，以及它们的进化的时间尺度，基于完整的线粒体基因组的119种蟑螂。发散测年分析表明，所有现存蟑螂的最后共同祖先出现在235 Ma，类似于95 My之前的化石，可以分配到现存的家庭，并在泛古陆开始分裂之前。我们重建了祖先蟑螂的地理范围，并通过几个主要谱系内部和之间的板块构造找到了对地理分布的初步支持。我们还发现了跨洋传播的证据，在整个澳大利亚，印度-马来亚，非洲和马达加斯加地区发现的血统。我们的分析提供的证据表明，在塑造这些昆虫的分布和多样性的替代和扩散发挥了重要作用。
Following the acceptance of plate tectonics theory in the latter half of the 20th century, vicariance became the dominant explanation for the distributions of many plant and animal groups. In recent years, however, molecular-clock analyses have challenged a number of well-accepted hypotheses of vicariance. As a widespread group of insects with a fossil record dating back 300 My, cockroaches provide an ideal model for testing hypotheses of vicariance through plate tectonics versus transoceanic dispersal. However, their evolutionary history remains poorly understood, in part due to unresolved relationships among the nine recognized families. Here, we present a phylogenetic estimate of all extant cockroach families, as well as a timescale for their evolution, based on the complete mitochondrial genomes of 119 cockroach species. Divergence dating analyses indicated that the last common ancestor of all extant cockroaches appeared similar to 235 Ma, similar to 95 My prior to the appearance of fossils that can be assigned to extant families, and before the breakup of Pangaea began. We reconstructed the geographic ranges of ancestral cockroaches and found tentative support for vicariance through plate tectonics within and between several major lineages. We also found evidence of transoceanic dispersal in lineages found across the Australian, Indo-Malayan, African, and Madagascan regions. Our analyses provide evidence that both vicariance and dispersal have played important roles in shaping the distribution and diversity of these insects.