1. Environment and Sustainability Institute, University of Exeter; Penryn Campus; Penryn Cornwall TR10 9FE U.K.
2. Animal Demography Unit, Department of Biological Sciences; University of Cape Town; Private Bag X3 Rondebosch 7701 South Africa
3. FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence; University of Cape Town; Rondebosch 7701 South Africa
4. Marine Research Institute; University of Cape Town; Private Bag X3 Rondebosch 7701 South Africa
5. Department of Agriculture; Forestry and Fisheries (DAFF); Private Bag X2, Rogge Bay 8012 Cape Town South Africa
6. Department of Environmental Affairs (DEA); P.O. Box 52126 Cape Town 8000 South Africa
7. Institute of Ecology and Environmental Sciences, Evolutionary Eco-physiology Team; University Pierre et Marie Curie; Bâtiment A-7ème étage, 7 quai, St Bernard 75005 Paris France