1. Institute of Biological and Environmental Sciences University of Aberdeen Aberdeen AB24 2TZ UK
2. Programme for Whale Research Marine Research Institute P.O. Box 1390 121 Reykjavik Iceland
3. Húsavik Research Center University of Iceland Hafnarstett 3640 Húsavik Iceland
4. Institute of Marine Alliance for Science and Technology for Scotland University of Aberdeen Aberdeen AB24 2TZ UK