Colonization history of north European field voles (Microtus agrestis) revealed by mitochondrial DNA
Colonization history of north European field voles (Microtus agrestis) revealed by mitochondrial DNA
复制标题
线粒体 DNA 揭示北欧田鼠 (Microtus agrestis) 的定殖历史
作者：
M. Jaarola;H. Tegelström
采用线粒体DNA限制性片段长度多态性（mtDNA）对来自北欧67个地区的150只田鼠（Microtus agrestis）种群进行了遗传结构分析。共观察到83个单倍型，其中大多数是罕见的，地理位置高度定位。总体核苷酸多样性较高（134%），但随纬度升高呈下降趋势。鉴定了两个主要的mtDNA谱系，核苷酸序列差异为2%。在来自英国、丹麦和瑞典南部和中部的田鼠中发现了南方mtDNA谱系，而来自芬兰和瑞典北部的田鼠则属于北方谱系。严格的系统地理格局表明，目前田鼠种群属结构反映了冰川历史：两个种群来自不同的冰川避难所，并从两个方向重新定居于芬诺斯坎迪亚。在瑞典北部发现了两个mtDNA类群之间150-200公里宽的次级接触区。在两个主要mtDNA群中观察到不同的系统地理亚结构。
The genetic structure of field vole (Microtus agrestis) populations from northern Europe was examined by restriction fragment length polymorphisms of mitochondrial DNA (mtDNA) in 150 individuals from 67 localities. A total of 83 haplotypes was observed, most of which were rare and highly localized geographically. Overall nucleotide diversity was high (134%), but showed a tendency to decrease with higher latitude. Two major mtDNA lineages differing by 2% in nucleotide sequence were identified. A southern mtDNA lineage was observed in field voles from Britain, Denmark and southern and central Sweden, whereas voles from Finland and northern Sweden belonged to a northern lineage. The strict phylogeographic pattern suggests that the present population generic structure in field voles reflects glacial history: the two groups are derived from different glacial refugia, and recolonized Fennoscandia from two directions. A 150–200‐km‐wide secondary contact zone between the two mtDNA groups was found in northern Sweden. Distinct phylogeographic substructuring was observed within both major mtDNA groups.
影响因子：
3.3
作者：
M. Nei;F. Tajima
通讯作者：
M. Nei;F. Tajima