Thulin C G, Jaarola M, Tegelström H
Department of Genetics, Uppsala University, Sweden.
Mol Ecol. 1997 May;6(5):463-7. doi: 10.1046/j.1365-294x.1997.t01-1-00199.x.
If interspecific hybrids are fertile and backcross to either parental species, transmission of mitochondrial DNA over the species barrier can occur. To investigate if such transmission has occurred between the brown hare Lepus europeus Pall and the mountain hare L. timidus L. in Scandinavia, an analysis of genetic variation in mitochondrial DNA from 36 hares, collected from 15 localities, was performed. Sequence divergence of mtDNA between species was estimated at 8 +/- 1% (SD). Intraspecific mtDNA sequence divergence varied between 0.09 and 0.38% in brown hares and 0.10 and 1.44% in mountain hares. In six out of 18 brown hares examined, two different haplotypes of mountain hare origin were detected, demonstrating a transmission of mtDNA haplotypes from mountain hares to brown hares. The results indicate that interspecific hybridization between the two species occurs in wild populations.
如果种间杂种是可育的，并与任一亲本物种回交，那么线粒体DNA就可能跨越物种屏障进行传递。为了研究在斯堪的纳维亚半岛，欧洲野兔（Lepus europeus Pall）和山地野兔（L. timidus L.）之间是否发生了这种传递，我们对从15个地点采集的36只野兔的线粒体DNA遗传变异进行了分析。两个物种之间线粒体DNA的序列差异估计为8±1%（标准差）。欧洲野兔种内线粒体DNA序列差异在0.09%至0.38%之间，山地野兔种内线粒体DNA序列差异在0.10%至1.44%之间。在检测的18只欧洲野兔中，有6只检测到了两种源自山地野兔的不同单倍型，这表明线粒体DNA单倍型从山地野兔传递到了欧洲野兔。结果表明，这两个物种在野生种群中发生了种间杂交。
