Data for isolation-by-environment and its consequences for range shifts with global change: Landscape genomics of the invasive common tansy

Invasive species are a growing global economic and ecological problem.
However, it is not well understood how environmental factors mediate
invasive range expansion. In this study, we investigated the recent and
rapid range expansion of common tansy across environmental gradients in
Minnesota, U.S.A. We densely sampled individuals across the expanding
range and performed reduced representation sequencing to generate a
dataset of 3071 polymorphic loci for 176 individuals. The dataset includes
additional samples from the native range in Finland that were not used in
the downstream analysis but are contributed for completeness. The
dataset includes the genotype calls for all individuals sampled and
sequenced. The genotype file was generated by stacks2.59 running
the denovo pipeline and then using the populations function where we kept
loci that were in 70% of populations and had a minor allele frequency of
at least 1%. We used non-spatial and spatially-explicit analyses to
determine the relative influences of geographic distance and environmental
variation on patterns of genomic variation. We found no evidence for
isolation-by-distance (IBD) but strong evidence for
isolation-by-environment (IBE), indicating that environmental factors may
have modulated patterns of range expansion.

外来入侵物种已成为日益严峻的全球性经济与生态问题。
然而，学界对环境因子如何介导入侵物种的分布范围扩张过程仍缺乏充分认知。
本研究以美国明尼苏达州境内沿环境梯度发生近期快速分布范围扩张的菊蒿（common tansy）为研究对象，在该扩张分布区内开展了高密度个体采样，并通过简化基因组测序（reduced representation sequencing）构建了包含176个个体、共计3071个多态性位点的数据集。
本数据集还纳入了采自芬兰原生分布区的额外样本——这些样本未参与下游分析，仅为保证数据集完整性而加入。
数据集涵盖所有采样并完成测序个体的基因型分型结果。
基因型文件通过stacks2.59的denovo分析流程及populations函数生成，筛选标准为在70%的种群中均可检测到且最小等位基因频率不低于1%的位点。
本研究采用非空间与空间显式分析方法，解析地理距离与环境变异对基因组变异模式的相对影响。
本研究未检测到距离隔离（isolation-by-distance, IBD）的相关证据，但发现了显著的环境隔离（isolation-by-environment, IBE）信号，表明环境因子可能介导了该物种的分布范围扩张模式。