Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University, Lanzhou, China.
Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University, Lanzhou, China.
Gene. 2021 Feb 5;768:145264. doi: 10.1016/j.gene.2020.145264. Epub 2020 Oct 28.
Environmental factors can promote genetic divergence among populations. The Tarim Basin has experienced a series of environmental and geological changes since the late Pliocene. Phrynocephalus forsythii (Agamidae) has a continuous and circular distribution around the Tarim Basin, and the evolutionary history of this species remains unclear. In the present study, mitochondrial DNA and single nucleotide polymorphism sequences were obtained from 195 P. forsythii samples in the Tarim Basin to examine the phylogeographic structure and evolutionary history of this species. All populations of P. forsythii formed three distinct clusters: the Minfeng, low-elevation, and high-elevation groups. The Minfeng group was the first to separate from all other groups at 4.26 Ma after the original desert environment emerged in the Tarim Basin. The uplift of the Kunlun Mountains created a new high-altitude environment along the southwestern edge of the basin and promoted the divergence of low-elevation and high-elevation groups at 3.67 Ma. Subsequently, the gradual development of deserts and rivers in the Tarim Basin accelerated the dispersal of P. forsythii, eventually forming the current distribution pattern. Our results indicate that ecological separation caused by environmental and geological changes in the Tarim Basin was the main cause for the genetic divergence of P. forsythii.
环境因素可以促进种群间的遗传分化。自上新世晚期以来，塔里木盆地经历了一系列的环境和地质变化。密点麻蜥（鬣蜥科）在塔里木盆地周围呈连续的圆形分布，但其进化历史尚不清楚。本研究从塔里木盆地的 195 个密点麻蜥样本中获得了线粒体 DNA 和单核苷酸多态性序列，以检验该物种的系统地理结构和进化历史。所有密点麻蜥种群形成了三个明显的聚类： 民丰组、低海拔组和高海拔组。民丰组是在塔里木盆地出现原始沙漠环境后，于 4.26Ma 前与其他所有组最早分离的。昆仑山脉的隆升在盆地西南缘形成了一个新的高海拔环境，促进了低海拔组和高海拔组在 3.67Ma 的分化。随后，塔里木盆地沙漠和河流的逐渐发育加速了密点麻蜥的扩散，最终形成了目前的分布格局。我们的研究结果表明，塔里木盆地环境和地质变化导致的生态隔离是密点麻蜥遗传分化的主要原因。
