1. Marine Institute, Rinville, Oranmore, County Galway, Ireland
2. Institute of Biological and Environmental Sciences, University of Aberdeen, Tillydrone Avenue, Aberdeen, AB24 2TZ Scotland, UK
3. Sea State Inc., PO Box 74, Vashon, WA 98070, USA
4. Carrera de Biologia Marina, Universidad Cientifica del Sur, Panamericana Sur Km 19, Villa, Lima, Peru
5. ProDelphinus, Jose Galvez 780E, Miraflores, Lima 15074, Peru
6. Centre for Ecology and Conservation, University of Exeter, Cornwall TR10 9FE, UK