Macfarlane Colin Bran Alexander, Natola Libby, Brown Mike W, Burg Theresa M
University of Lethbridge Lethbridge AB Canada.
Ecol Evol. 2016 Oct 21;6(22):8304-8317. doi: 10.1002/ece3.2524. eCollection 2016 Nov.
Using a combination of mitochondrial and z-linked sequences, microsatellite data, and spatio-geographic modeling, we examined historical and contemporary factors influencing the population genetic structure of the purple finch (). Mitochondrial DNA data show the presence of two distinct groups corresponding to the two subspecies, and . The two subspecies likely survived in separate refugia during the last glacial maximum, one on the Pacific Coast and one east of the Rocky Mountains, and now remain distinct lineages with little evidence of gene flow between them. Southwestern British Columbia is a notable exception, as subspecies mixing between central British Columbia and Vancouver Island populations suggests a possible contact zone in this region. Z-linked data support two mitochondrial groups; however, Coastal Oregon and central British Columbia sites show evidence of mixing. Contemporary population structure based on microsatellite data identified at least six genetic clusters: three clusters, two clusters, and one mixed cluster, which likely resulted from high site fidelity and isolation by distance, combined with sexual selection on morphological characters reinforcing subspecies differences.
我们运用线粒体和Z染色体连锁序列、微卫星数据以及空间地理建模相结合的方法，研究了影响紫翅椋鸟种群遗传结构的历史和当代因素。线粒体DNA数据显示存在两个与两个亚种相对应的不同群体。这两个亚种在上次末次盛冰期可能在不同的避难所中存活下来，一个在太平洋海岸，另一个在落基山脉以东，如今仍然是不同的谱系，几乎没有它们之间基因流动的证据。不列颠哥伦比亚省西南部是一个显著的例外，因为不列颠哥伦比亚省中部和温哥华岛种群之间的亚种混合表明该地区可能存在接触带。Z染色体连锁数据支持两个线粒体群体；然而，俄勒冈州沿海和不列颠哥伦比亚省中部的地点显示出混合的证据。基于微卫星数据的当代种群结构确定了至少六个遗传簇：三个簇、两个簇和一个混合簇，这可能是由于高地点保真度和距离隔离，再加上对形态特征的性选择强化了亚种差异所致。
