1. Marine Apex Predator Research Unit, Institute for Coastal and Marine Research and Department of Zoology Nelson Mandela University Port Elizabeth South Africa
2. Centre for Statistics in Ecology, Environment and Conservation, Department of Statistical Sciences University of Cape Town Cape Town South Africa
3. Institute of Biochemistry and Biophysics Polish Academy of Sciences Warsaw Poland
4. Antarctic Ecosystem Research Division, Southwest Fisheries Science Center National Marine Fisheries Service, National Oceanic and Atmospheric Administration La Jolla California USA
5. Departamento Biología de Predadores Tope Instituto Antártico Argentino Buenos Aires Argentina
6. Laboratorios Anexos Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata Buenos Aires Argentina
7. Norwegian Polar Institute, Research Department Fram Centre Tromsø Norway