1. Institute for Environmental Protection and Research Rome Italy
2. Tethys Research Institute Milan Italy
3. Department of Mathematics and Statistics Washington State University Vancouver Washington
4. School of Biological, Earth and Environmental Sciences University College Cork Cork Ireland
5. Marine Mammal and Turtle Division Southwest Fisheries Science Center, National Marine Fisheries Service La Jolla California
6. Antarctic Ecosystem Research Division Southwest Fisheries Science Center, National Marine Fisheries Service La Jolla California
7. Marine Mammal Institute Oregon State University Newport Oregon
8. Institute of Biodiversity Research and Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology University of Barcelona Barcelona Spain