Data from: Phylogeography of the Trans-Volcanic bunchgrass lizard (Sceloporus bicanthalis) across the highlands of southeastern Mexico

We quantify the population divergence processes that shaped population genetic structure in the Trans-Volcanic bunchgrass lizard (Sceloporus bicanthalis) across the highlands of south-eastern Mexico. Multilocus genetic data from nine nuclear loci and mitochondrial (mt)DNA were used to estimate the population divergence history for 47 samples of S. bicanthalis. Bayesian clustering methods partitioned S. bicanthalis into three populations: (1) a southern population in Oaxaca and southern Puebla; (2) a population in western Puebla; and (3) a northern population with a broad distribution across Hidalgo, Puebla, and Veracruz. The multilocus nuclear data and mtDNA both supported a Late Pleistocene increase in effective population size, and the nuclear data revealed low levels of unidirectional gene flow from the widespread northern population into the southern and western populations. Populations of S. bicanthalis experienced different demographic histories during the Pleistocene, and phylogeographical patterns were similar to those observed in many co-distributed highland taxa. Although we recommend continuing to recognize S. bicanthalis as a single species, future research on the evolution of viviparity could gain novel insights by contrasting physiological and genomic patterns among the different populations located across the highlands of south-eastern Mexico.

我们定量解析了塑造墨西哥东南部高地跨火山带丛草蜥蜴（Sceloporus bicanthalis）种群遗传结构的种群分化过程。本研究以47份该物种的样本为材料，利用9个核基因座与线粒体（mt）DNA的多位点遗传数据，推断其种群分化历史。通过贝叶斯聚类方法，该物种被划分为3个种群：1）分布于瓦哈卡州与普埃布拉州南部的南部种群；2）分布于普埃布拉州西部的西部种群；3）分布于伊达尔戈州、普埃布拉州与韦拉克鲁斯州全域的北部广布种群。多位点核数据与线粒体DNA均支持该物种在晚更新世经历了有效种群规模的扩张，且核数据显示存在从广布北部种群向南部与西部种群的低水平单向基因流。该物种的各个种群在更新世时期经历了各异的种群动态历史，其系统地理格局与诸多同分布高地类群的模式相似。尽管本研究建议仍将其视为单一物种，但未来针对胎生演化的研究可通过对比墨西哥东南部高地不同种群的生理与基因组特征，获得全新的研究视角。