Population genetic structure associated with a landscape barrier in the Western Grasswren (Amytornis textilis textilis)

Dispersal patterns can dictate genetic population structure, and ultimately population resilience, through maintaining gene flow and genetic diversity. However, geographic landforms, such as peninsulas, can impact dispersal patterns and thus be a barrier to gene flow. Here, we use 13,375 genome-wide single-nucleotide polymorphisms (SNPs) to evaluate genetic population structure and infer dispersal patterns of the Western Grasswren (Amytornis textilis textilis; WGW, n = 140) in the Shark Bay region of Western Australia. We found high levels of genetic divergence between subpopulations on the mainland (Hamelin) and narrow peninsula (Peron). In addition, we found evidence of further genetic sub-structuring within the Hamelin subpopulation, with individuals collected from the western and eastern regions of a conservation reserve forming separate genetic clusters. Spatial autocorrelation analysis within each subpopulation revealed significant local-scale genetic structure up to 35 km at Hame..., SNP data was obtained from blood samples. ,

扩散模式通过维持基因流与遗传多样性，能够决定种群遗传结构，并最终影响种群恢复力。然而，半岛等地理地貌会干扰扩散模式，进而成为基因流的屏障。本研究利用13,375个全基因组单核苷酸多态性（SNPs），评估西澳大利亚州鲨鱼湾地区西部草鹩莺（Amytornis textilis textilis；WGW，样本量n=140）的种群遗传结构并推断其扩散模式。结果显示，大陆（哈梅林）与狭窄半岛（佩伦）上的亚种群间存在高度遗传分化；此外，哈梅林亚种群内部存在进一步的遗传亚结构特征——从某保护区西部与东部采集的个体形成了独立的遗传簇。对各亚种群的空间自相关分析表明，在哈梅...区域，局部尺度（最远35公里）存在显著遗传结构；SNP数据来源于血液样本。