Wildlife Refuges in the Pacific Southwest Regions of U.S.
We used 48 units located in California, Oregon and Nevada, USA (Fig. 1). These comprise 47 refuges and one area of interest, the North Central Valley WMA (Wildlife Management Area), which is a generalized area in which the USFWS has interest but does not manage. The average refuge size is 99 km2, leaving aside the unusually large North Central Valley WMA (19,128 km2) and the Desert NWR (6,619 km2) (see Table S1 in Supporting Information).