Fig. 1

Map with the coordinates of all seven sampling sites (★) in Ankang, Shaanxi Province, China. The maps of Ankang city and Shaanxi Province was generated using ArcGIS (version 10.0; http://www.arcgis.com/index.html) and edited using Adobe Illustrator. The map of China was obtained from http://english.freemap.jp/item/asia/china.html