1. U.S. Fish and Wildlife Service, Alaska Maritime National Wildlife Refuge, 95 Sterling Highway, Suite 1, MS 505, Homer, Alaska 99603, U.S.A
2. School of Life Sciences, University of Nevada, Las Vegas, 4505 Maryland Parkway, Las Vegas, Nevada 89154-4004, U.S.A
3. U.S. Geological Survey, Alaska Volcano Observatory, 4210 University Drive, Anchorage, Alaska 99508, U.S.A