1. Department of Zoology; DST/NRF Centre of Excellence at the Percy FitzPatrick Institute for African Ornithology; Nelson Mandela Metropolitan University; Port Elizabeth South Africa
2. Institute for Marine and Antarctic Studies; University of Tasmania; Hobart Tas Australia
3. Oceans and Coasts; Department of Environmental Affairs; Cape Town South Africa
4. Animal Demography Unit; University of Cape Town; Rondebosch South Africa
5. DST/NRF Centre of Excellence at the Percy FitzPatrick Institute for African Ornithology; University of Cape Town; Rondebosch South Africa