We recorded the precise spatial locations of all frogs in the field on a digital map with the mobile GIS software ArcPad™ 7/8/10 (ESRI), using pocket computers (Hewlett Packard iPaq™ hx1950 & hx4700, Ashtech MobileMapper™ 6) and further handled the data in ArcGIS™ 9.3 (ESRI)...