1. Centre for Statistics in Ecology, Environment and Conservation, Department of Statistical Sciences, University of Cape Town, Cape Town, South Africa
2. Department of Botany and Zoology, Stellenbosch University, Stellenbosch, South Africa
3. Sea Search Research and Conservation NPC, Cape Town, South Africa
4. Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, Pretoria, South Africa
5. Wildlife Conservation Society Canada, Whitehorse, Yukon, Canada
6. Department of Biology, University of Victoria, Victoria, British Columbia, Canada
7. Department of Biodiversity and Conservation Management, Cape Peninsula University of Technology, Cape Town, South Africa
8. Lüderitz Marine Research, Ministry of Fisheries and Marine Resources, Lüderitz, Namibia
9. Current affiliation: SEACODE and Namibia Nature Foundation, Lüderitz, Namibia
10. Sea Mammal Research Unit, School of Biology, University of St Andrews, St Andrews, Scotland, United Kingdom