1. Sea Mammal Research Unit, Scottish Oceans InstituteUniversity of St Andrews St Andrews UK
2. Duke University Marine Lab, Division of Marine Science and Conservation, Nicholas School of the EnvironmentDuke University Beaufort North Carolina
3. Lighthouse Field Station, Institute of Biological and Environmental SciencesUniversity of Aberdeen Cromarty UK
4. Department of Mathematics and StatisticsWashington State University Vancouver Washington
5. School of Biological, Earth and Environmental SciencesUniversity College Cork Cork Ireland