Lönn Mikael, Prentice Honor C, Bengtsson Karin
Department of Ecological Botany, Uppsala University, Villavägen 14, S-752 36, Uppsala, Sweden.
Oecologia. 1996 May;106(3):308-316. doi: 10.1007/BF00334558.
Relationships between allozyme differentiation, habitat variation and individual reproductive success were examined in local populations of a perennial herb, Gypsophila fastigiata, on the Baltic island of Öland (Sweden). Relatively little (c. 2%) of the total allozyme diversity in this largely outcrossing species is explained by differentiation between sites tens of kilometres apart. The low level of geographic differentiation suggests that gene flow between sites is, or has recently been, extensive. Yet the component of allozyme diversity due to differentiation between plots (only tens of meters apart) within sites is 3 times larger than the between-site component of diversity. Allozyme variation, especially at the Pgi-2 locus, is significantly associated with habitat variation within sites. Different allele x habitat combinations for the Pgi-2 locus are associated with differences in individual reproductive fitness. Differential selection in different local habitats may thus contribute to the fine-scale structuring of genetic diversity within sites.
在瑞典波罗的海厄兰岛上的多年生草本植物直立丝石竹的当地种群中，研究了等位酶分化、栖息地变异与个体繁殖成功率之间的关系。在这个主要进行异交的物种中，相距数十公里的不同地点之间的分化，仅解释了总等位酶多样性中相对较少的一部分（约2%）。地理分化程度较低表明，不同地点之间的基因流动现在或最近一直很广泛。然而，由于同一地点内相距仅几十米的不同小区之间的分化所导致的等位酶多样性部分，是不同地点之间多样性部分的3倍。等位酶变异，尤其是在磷酸葡萄糖异构酶-2（Pgi-2）位点，与同一地点内的栖息地变异显著相关。Pgi-2位点的不同等位基因与栖息地组合，与个体繁殖适合度的差异相关。因此，不同当地栖息地中的差异选择，可能有助于同一地点内遗传多样性的精细尺度结构形成。
