1. U.S. Geological Survey, New Mexico Cooperative Fish and Wildlife Research Unit, PO Box 30003 MSC 4901, Las Cruces, New Mexico 88003, USA
2. Michigan Department of Natural Resources, Rose Lake Wildlife Disease Laboratory, 8562 East Stoll Road, East Lansing, Michigan 48823, USA
3. Michigan Department of Natural Resources, 191 S. Mt. Tom Road, Mio, Michigan 48647, USA
4. Environmental Management Research Institute, 210 Borderlands PO Box 717, Seeley Lake, Montana 59868, USA
5. Michigan Department of Natural Resources, Northern Michigan University, Department of Geography, 213 West Science Building, Marquette, Michigan 49855, USA