1. LGL Alaska Research Associates, Inc., 4175 Tudor Centre Drive, Suite 202, Anchorage, Alaska 99508, USA
2. Department of Range, Wildlife, and Fisheries Management, Texas Tech University, Box 42125, Lubbock, Texas 79409, USA
3. Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, Alaska 99775, USA
4. Alaska State Virology Laboratory, Fairbanks, Alaska 99706, USA
5. Agricultural and Forestry Experiment Station, School of Agriculture and Land Resource Management, University of Alaska, Palmer, Alaska 99645, USA