荒漠沙蜥遗传多样性的地理变异

荒漠沙蜥(Phrynocephalus przewalskii)是一种进化地位至今存在争议的沙漠蜥蜴,该文基于12个不同地理种群119号荒漠沙蜥样本线粒体基因组ND2序列,在分析其系统进化历史的同时,研究了不同环境因素对其遗传多样性的影响。结果发现,12个地理种群聚类成3个明显的分枝,变色沙蜥(P.versicolor)和A枝处于与B、C两枝并列的位置。所调查种群的遗传多样性存在显著的地理变异,分析显示纬度、降雨和降雨变异对种群的遗传多样性都存在影响:随纬度升高、降雨增加,或降雨变异增加,种群遗传多样性均有下降趋势。推测纬度可能通过影响降雨和降雨变异对遗传多样性产生作用。

Phylogeny and genetic diversity of Phrynocephalus przewalskii

Phrynocephalus przewalskii is one kind of lizards inhabiting inclusively in the desert that has controversial viewpoints on its phylogeny. Based on mitochondrial ND2 gene of 119 samples from 12 geographic populations, we analyzed the effects of environmental factors on the variation of genetic diversity, as well as its relationship to P. versicolor. The results showed that these populations clustered into three major lineages, with P. versicolor embedded within one lineage. The twelve populations had great genetic diversity variation, which was tightly linked with local altitude, annual precipitation, and variation of annual precipitation. High latitudes, increased annual precipitation and great variation in annual precipitations may all have resulted in the decrease of genetic diversity. It thus assumed that altitude can change the genetic diversity of different geographic populations of P. przewalskii resulting from the effects of different local annual precipitation.