1. CESAM, Departamento de Biologia Animal, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Lisboa 1749-016, Portugal
2. Wildlife Biology Program, Department of Ecosystem and Conservation Sciences, W. A. Franke College of Forestry and Conservation, University of Montana, Missoula, MT 59812, USA
3. SAERI—South Atlantic Environmental Research Institute, Stanley, Falkland Islands FIQQ 1ZZ, UK
4. Environment and Sustainability Institute, University of Exeter, Penryn Campus, Penryn TR10 9FE, UK
5. MARE – Marine and Environmental Sciences Centre, ISPA – Instituto Universitário, Rua Jardim do Tabaco 34, Lisboa 1149-041, Portugal