Data from: Male-biased dispersal causes intersexual differences in the subpopulation structure of the gray-sided vole

The genetic structure of gray-sided voles was investigated at a spatial scale of 2 km using mtDNA sequences. The control region (674bp) of 162 voles was sequenced and 18 haplotypes were identified. Within 0.5-ha trapping plots (n = 8), the number of haplotypes and gene diversity was significantly greater in males than in females. The fixation index among plots for females (F GP = 0.241) was 3 times as large as that for males (0.075), implying male-biased dispersal. A simulation analysis showed that the observed genetic structure in males could be generated by modifying the observed haplotype distribution of females by adding the effects of local male dispersal. Half of the pairwise F GP (15/28) showed significant differentiation in females, whereas almost none (1/28) were significant in males. Isolation by distance was observed in females, whereas no clear spatial pattern was observed in males. Most pairwise F GP for females were not significant in the short- and intermediate-distance classes (≤1.0 km) as with those for males, whereas all showed significant differentiation in the long-distance class (>1.0 km) for females, but not for males. These findings indicate that the extent of subpopulations within which individuals interact differs between sexes.

本研究以2 km的空间尺度，采用线粒体DNA（mtDNA）序列，对灰背田鼠（Gray-sided vole）的遗传结构展开了调查。研究人员对162只灰背田鼠的线粒体DNA控制区（674 bp）进行了测序，共鉴定出18个单倍型（haplotype）。在8个0.5公顷的捕鼠样地（n=8）中，雄性个体的单倍型数量与基因多样性均显著高于雌性。样地间雌性个体的固定指数（F_GP = 0.241）是雄性（0.075）的3倍，这表明存在雄性偏向扩散现象。模拟分析结果显示，通过引入局部雄性扩散效应，调整雌性的单倍型分布模式，即可复现观测到的雄性遗传结构。雌性个体的成对F_GP值中，有一半（15/28）呈现出显著的遗传分化，而雄性个体的成对F_GP值中仅有1/28表现出显著差异。雌性个体呈现出距离隔离效应，而雄性个体则未表现出明显的空间遗传格局。在短距离和中等距离区间（≤1.0 km）内，雌性与雄性的多数成对F_GP值均未表现出显著差异；但在长距离区间（>1.0 km），雌性个体的所有成对F_GP值均呈现显著遗传分化，而雄性个体则无此现象。上述研究结果表明，雌雄个体间发生相互作用的亚种群范围存在显著差异。