High site fidelity does not equate to population structure for common goldeneye and Barrow’s goldeneye in North America.

Delineation of population structure provides valuable information for conservation and management of species, as levels of demographic and genetic connectivity not only affect population dynamics but also have important implications for adaptability and resiliency of populations and species. Here, we measure population genetic structure and connectivity across the respective ranges of two sister species of Goldeneye, Barrow’s Goldeneye (Bucephala islandica) and Common Goldeneye (B. clangula). We use two different marker types: 7 nuclear microsatellite loci assayed across 229 samples and 3,678 double digest Restriction-site Associated DNA Sequencing (ddRAD-seq) loci assayed across 61 samples. First, both datasets failed to uncover genetic structure within Common or Barrow’s Goldeneye, including between North American and European samples of Common Goldeneye. These results are in contrast with previous mitochondrial DNA, band recovery, and telemetry data which suggests that goldeneyes are...种群结构解析可为物种种群的保护与管理提供关键依据，因为种群统计与遗传连通性水平不仅影响种群动态，还对物种种群的适应性与恢复力具有重要意义。本研究针对两种鹊鸭属姊妹物种的分布范围分别开展种群遗传结构与连通性分析，即巴氏鹊鸭（Barrow’s Goldeneye，*Bucephala islandica*）与普通鹊鸭（Common Goldeneye，*B. clangula*）。本研究采用两类分子标记进行实验分析：一是对229份样本进行基因分型的7个核微卫星位点，二是对61份样本进行测序的3678个双酶切限制性位点相关DNA测序（double digest Restriction-site Associated DNA Sequencing，ddRAD-seq）位点。研究结果显示，两类数据集均未在普通鹊鸭或巴氏鹊鸭种群中检测到遗传结构，其中普通鹊鸭的北美与欧洲种群样本间也未检出遗传分化。上述结果与此前基于线粒体DNA、环志回收数据与遥测技术得到的研究结论相悖，后者表明鹊鸭类群……