Zaslavskaya N I, Pudovkin A I
Institute of Marine Biology, Russian Academy of Sciences, Vladivostok, 690041 Russia.
Genetika. 2005 Mar;41(3):374-84.
Variation at four highly polymorphic allozyme loci (inorganic pyrophosphatase, peptidase, and two esterase loci) was examined in 25 settlements of the marine snail Littorina sitkana (Mollusca, Gastropoda). The sampling localities covered a wide part of the species range: from the Peter the Great Bay (the Sea of Japan) at the southwest to the Mednyi Island (Commander Islands) at the northeast. Like other littorines lacking the pelagic stage, L. sitkana was characterized by significant genetic differentiation (G(ST) for the pooled sample was 0.310). Cluster analysis and nonmetric multidimensional scaling conducted on a matrix of pairwise genetic distances between all of the settlements studied revealed four genetically different groups: southern Primorye, northern Prymorye, Sakhalin, and Kuril-Commanders. The population-genetic structure of the L. sitkana settlements is close to that described by the isolation-by-distance and stepping-stone models: the geographic and the genetic distances between the most settlements examined are distinctly correlated.
在海洋蜗牛西氏滨螺（软体动物门，腹足纲）的25个聚居地中，研究了四个高度多态的等位酶位点（无机焦磷酸酶、肽酶和两个酯酶位点）的变异情况。采样地点覆盖了该物种分布范围的很大一部分：从西南部的彼得大帝湾（日本海）到东北部的梅德尼岛（指挥官群岛）。与其他没有浮游阶段的滨螺一样，西氏滨螺具有显著的遗传分化特征（合并样本的G(ST)为0.310）。对所有研究聚居地之间的成对遗传距离矩阵进行的聚类分析和非度量多维标度分析显示出四个遗传上不同的群体：南滨海边疆区、北滨海边疆区、萨哈林岛和千岛-指挥官群岛。西氏滨螺聚居地的群体遗传结构与距离隔离模型和踏脚石模型所描述的相近：所研究的大多数聚居地之间的地理距离和遗传距离明显相关。
