1. Department of Fish, Wildlife, and Conservation Biology Colorado State University Fort Collins Colorado 80523 USA
2. Department of Natural Resources and Environmental Science University of Nevada Reno Nevada 89557 USA
3. U.S. Fish and Wildlife Service Marine Mammals Management Anchorage Alaska 99503 USA
4. Southeast Alaska Inventory and Monitoring Network National Park Service Juneau Alaska 99801 USA
5. Glacier Bay Field Station National Park Service Juneau, Alaska 99801 USA
6. U.S. Geological Survey Colorado Cooperative Fish and Wildlife Research Unit Fort Collins Colorado 80523 USA
7. Department of Statistics Colorado State University Fort Collins Colorado 80523 USA