School of Natural Sciences & Sierra Nevada Research Institute, University of California, Merced, 5200 North Lake Road, Merced, CA 95344, USA.
J Hered. 2013 Mar;104(2):202-16. doi: 10.1093/jhered/ess138. Epub 2013 Jan 16.
Landscape alterations have dramatic impacts on the distribution of genetic variation within and among populations and understanding these effects can guide contemporary and future conservation strategies. We initiated a landscape-scale genetic study of the coastal tailed frog (Ascaphus truei) on commercial timberlands within the southern range of the species in Mendocino County (CA, USA). In total, 294 individuals from 13 populations were analyzed at 9 microsatellite loci. None of the sampled populations departed from mutation-drift equilibrium, indicating recent population bottlenecks were not detected in contemporary samples. Fine-scale analysis indicated sampled populations were structured at the watershed level (mean F (ST) = 0.077 and mean G'(ST) = 0.425). Landscape analyses suggested wet and moist areas may serve as significant corridors for gene flow within watersheds in this region (r (2) = 0.32-0.54 for moisture-related features). Results indicate populations of frogs may have persisted at this scale through intense periods of timber harvest, making southern range edge populations of coastal tailed frogs resilient to past land use practices.
景观改变对种群内和种群间遗传变异的分布有巨大影响，了解这些影响可以指导当代和未来的保护策略。我们在门多西诺县（加利福尼亚州，美国）的沿海长尾蛙（Ascaphus truei）物种南部范围内的商业林地进行了景观尺度的遗传研究。共分析了来自 13 个种群的 294 个个体在 9 个微卫星位点上。没有一个抽样种群偏离突变-漂移平衡，这表明在当代样本中没有检测到最近的种群瓶颈。精细尺度分析表明，抽样种群在流域水平上存在结构（平均 F（ST）= 0.077，平均 G'（ST）= 0.425）。景观分析表明，在该地区，潮湿和湿润地区可能是流域内基因流动的重要走廊（与湿度相关的特征的 r（2）= 0.32-0.54）。结果表明，在密集的木材采伐时期，青蛙种群可能在这种规模上持续存在，使沿海长尾蛙的南部边缘种群对过去的土地利用实践具有弹性。
