Data from: Temporal population genetic instability in range edge Western Toads, Anaxyrus boreas

In this paper, we address the temporal stability of population genetic structure in a range-edge population that is undergoing continual, short-distance colonization events. We sampled Western toad, Anaxyrus boreas, breeding populations over two seasons near their northern range limit in southeast Alaska. We sampled 20 ponds each during the summers of 2008 and 2009, with 14 ponds sampled in both summers. We found considerable turnover in the population genetic relationships among ponds in those two seasons, as well as biologically meaningful genetic differentiation between years within some ponds. We found relatively consistent relationships between major population centers, while the relationships between the central ponds and smaller, outlying populations differed year to year. This finding indicates that multiple years of genetic sampling may be important for understanding the genetic landscape of some populations.本研究聚焦于正经历持续短距离拓殖事件的分布边缘种群的种群遗传结构时间稳定性。我们于阿拉斯加东南部其分布北限附近的两个繁育季，对西部蟾蜍（Western toad, *Anaxyrus boreas*）的繁育种群开展采样：2008年与2009年夏季各采样20处繁育池塘，其中14处池塘在两个夏季均被纳入采样范围。研究发现，两个繁育季间各池塘间的种群遗传关系存在显著更替，且部分池塘内不同年份间出现了具有生物学意义的遗传分化；主要种群集群间的遗传关系相对稳定，而核心池塘与小型外围种群间的遗传关系则逐年存在差异。该结果表明，针对部分种群开展多年遗传采样，或对解析其遗传格局具有重要意义。