1. Pacific Marine Environmental Laboratory/National Oceanic and Atmospheric Administration, 7600 Sand Point Way NE, Seattle, WA 98115–6349, USA.
2. Instituto de Investigaciones Oceanologicas, Universidad Autonoma de Baja California, Km. 103 Carr. Tijuana-Ensenada, Ensenada, Baja California, Mexico.
3. Fisheries and Oceans Canada, Institute of Ocean Science, Post Office Box 6000, Sidney, BC V8L 4B2, Canada.
4. College of Oceanic and Atmospheric Sciences, Oregon State University, 104 Ocean Administration Building, Corvallis, OR 97331–5503, USA.