1. Sea Mammal Research Unit, Scottish Oceans Inst., Univ. of St Andrews St Andrews KY16 8LB UK
2. Marine Biology and Ecology Research Centre, School of Biological and Marine Sciences, Univ. of Plymouth Plymouth UK
3. Marine Mammal Laboratory, Alaska Fisheries Science Center, NOAA NMFS Seattle USA
4. School of Applied Sciences, Abertay Univ. Dundee UK
5. Centre for Research into Ecological and Environmental Modelling, Univ. of St Andrew St Andrews UK