Freshwater Species by HUC8

Join of Species_HUC and Species_List to Watershed Boundary Dataset HUC8 - 2018. This dataset is unique at the species + watershed level. Users can filter by species to view watershed distribution. The watershed polygons are simplified to a 60m tolerance.将物种-流域单元（Species_HUC）与物种列表（Species_List）关联至2018年版8位水文单元代码（HUC8）流域边界数据集（Watershed Boundary Dataset）。本数据集以物种-流域组合为唯一粒度，不存在重复的物种-流域组合记录。用户可通过筛选物种，查看对应物种的流域分布情况。流域多边形已按60米容差进行简化。