1. U.S. Geological Survey; Alaska Science Center; 4210 University Drive; Anchorage AK 99508 USA
2. Black Duck Biological; 1965 Price Road Gabriola British Columbia, V0R 1X7 Canada
3. Department of Renewable Resources; British Columbia Institute of Technology; 3700 Willingdon Avenue Burnaby British Columbia, V5G 3H2 Canada
4. Washington Department of Fish and Wildlife; Puget Sound Assessment and Monitoring Program; 600 Capitol Way N Olympia WA 98501 USA