Hedrick P W, Gutierrez-Espeleta G A, Lee R N
Department of Biology, Arizona State University, Tempe, AZ 85287, USA.
Mol Ecol. 2001 Apr;10(4):851-7. doi: 10.1046/j.1365-294x.2001.01243.x.
The Tiburon Island population of desert bighorn sheep has increased in size from 20 founders in 1975 to approximately 650 in 1999. This population is now the only population being used as the source stock for transplantations throughout northern Mexico. To evaluate the genetic variation in this population, we examined 10 microsatellite loci and a major histocompatibility complex (MHC) locus. The genetic variation was significantly less than found in other populations of the same subspecies in Arizona. Using a model that takes into account the effects of genetic drift on genetic distance, most of the genetic distance observed between the Tiburon population and Arizona samples could be explained. Because of the low genetic variation found in the Tiburon population, it is suggested that the Tiburon population should be supplemented with additional unrelated animals or that the transplant populations should be supplemented with unrelated animals.
蒂布龙岛的沙漠大角羊种群数量已从1975年的20只创始羊增加到1999年的约650只。该种群现在是整个墨西哥北部移植所用的唯一种源。为评估该种群的遗传变异，我们检测了10个微卫星位点和一个主要组织相容性复合体（MHC）位点。其遗传变异显著低于在亚利桑那州同一亚种的其他种群中所发现的变异。使用一个考虑了遗传漂变对遗传距离影响的模型，可以解释在蒂布龙种群与亚利桑那样本之间观察到的大部分遗传距离。鉴于在蒂布龙种群中发现的遗传变异较低，建议应为蒂布龙种群补充额外的无亲缘关系动物，或者应为移植种群补充无亲缘关系动物。
