1. Marine Physical Laboratory, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92093-0238, USA
2. Greeneridge Sciences, Inc., 90 Arnold Place, Suite D, Santa Barbara, California 93117, USA
3. Departamento de Biologia Animal, Centro de Estatística e Aplicações, Faculdade de Ciências, Building C2-Level 2, Campo Grande, 1749-016 Lisbon, Portugal
4. CREEM/University of St Andrews, Fife KY16 9LZ, Scotland
5. Shell Exploration and Production Company, 3601 C Street, Anchorage, Alaska 99503, USA