Colonization, genetic diversity, and evolution in the Swedish sand lizard, Lacerta agilis (Reptilia, Squamata)
Colonization, genetic diversity, and evolution in the Swedish sand lizard, Lacerta agilis (Reptilia, Squamata)
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DOI：
10.1006/bijl.1998.0221
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发表时间：
1998-11-01
影响因子：
1.9
通讯作者：
Hegelström, H
中科院分区：
文献类型：
--
作者：
Gullberg, A;Olsson, M;Hegelström, H
瑞典沙蜥蜴（Lacerta agilis）是冰河后温暖时期的孑遗物种。根据该地区的地质历史，以及由于人类干扰而导致种群破碎的最新数据，可以推测瑞典沙蜥在相对较近的时期至少经历了一个种群瓶颈。我们通过调查来自瑞典不同地区的十个蜥蜴种群的六个微卫星位点的遗传变异性的数量和结构来检验这一假设。我们将这些数据与我们有理由假设的匈牙利人口数据进行了对比；与瑞典沙蜥的始祖种群非常相似。瑞典每个基因座的平均等位基因数量为 3.3，这些等位基因在几乎所有人群中都很常见，而匈牙利人群的等位基因平均数量为 8.0。同样，瑞典人群的预期杂合性水平 (0.45) 低于匈牙利人群 (0.70)。瑞典人口变异性较低可能是最近一次冰河期之后的移民过程中常见的人口瓶颈的结果。剩余的变异性在群体之间强烈细分（F-ST=0.30），主要遗传差异发生在群体之间而不是群体内部。尽管种群明显隔离且目前种群规模较小（N = 10-300 成年人），但瑞典孑遗种群显示出令人惊讶的高水平观察到的杂合性，表明种群规模较小可能是最近出现的现象。 (C) 1998 伦敦林奈学会。
The Swedish sand lizard (Lacerta agilis) is a relict species from the post-glacial warmth period. From the geological history of this region, and more recent data on population fragmentation due to disturbance by man, it can be surmised that the Swedish sand lizards passed through at least one population bottleneck in relatively recent times. We tested this hypothesis by investigating the amount and structuring of genetic variability in six microsatellite loci in ten lizard populations from different parts of Sweden. We contrasted these data against those from a Hungarian population which we have reason to assume; strongly resembles the founder population for Swedish sand lizards. The average number of alleles per locus in Sweden was 3.3, and these alleles were common in almost all populations, whereas the average number of alleles in the Hungarian population was 8.0. Likewise, the level of expected heterozygosity was lower in the Swedish populations (0.45) compared to the Hungarian population (0.70). The lower variability in Swedish populations is probably a consequence of a common population bottleneck during the immigration subsequent to the latest glacial period. The remaining variability is strongly subdivided between populations (F-ST=0.30) with the main genetic differences being between rather than within populations. Despite the marked isolation of the populations and the present small population sizes (N=10-300 adults), the Swedish relict populations show a surprisingly high level of observed heterozygosity, indicating that small population size is probably a recent phenomenon. (C) 1998 The Linnean Society of London.