Biogeographic barriers and historical climate affect phylogeographic structure and demographic history of the common gartersnake

Aim: Current distributions of widespread North American (NA) species have been shaped by Pleistocene glacial cycles, latitudinal temperature gradients, sharp longitudinal habitat transitions, and the vicariant effects of major mountain and river systems that subdivide the continent. Within these transcontinental species, genetic diversity patterns might not conform to established biogeographic breaks compared to more spatially restricted taxa due to intrinsic differences (e.g., greater dispersal ability in generalist species) or spatiotemporal differences (e.g., wide-ranging species predate younger barriers). In this study, we highlight the effects of these extrinsic variables on genetic structuring by investigating the phylogeographic history of a widespread generalist squamate found throughout NA. 
Location: North America
Taxon: Common gartersnake, Thamnophis sirtalis
Methods: We evaluate the effects of major river basins and the forest-grassland transition into the Interior Plains on..., ,

研究目的：广布北美洲（NA）物种的当前分布格局，由更新世冰期旋回、纬度温度梯度、显著的经度生境过渡，以及分割北美大陆的主要山脉与河流系统的异域分化效应共同塑造。相较于空间分布受限的类群，这类跨大陆广布物种的遗传多样性模式可能不符合已确立的生物地理断点，其驱动因素包括内在差异（如广食性物种更强的扩散能力）或时空差异（如分布范围广泛的物种早于年轻地理屏障出现）。本研究通过对一种遍及全北美的广食性有鳞类爬行动物开展系统地理历史研究，阐明上述外在变量对遗传结构的影响。
研究区域：北美洲
研究类群：普通束带蛇（Thamnophis sirtalis）
研究方法：本研究评估主要河流盆地以及森林-草原过渡带向北美内陆平原的延伸对[原文未完整呈现后续研究内容]的影响……