1. South African Environmental Observation Network (SAEON), Kimberley, South Africa
2. Plant Conservation Unit, Department of Biological Sciences, University of Cape Town, Cape Town, South Africa
3. Percy FitzPatrick Institute of African Ornithology, Department of Biological Sciences, University of Cape Town, Cape Town, South Africa
4. School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, Johannesburg, South Africa
5. Centre for Environmental Management, University of the Free State, Bloemfontein, South Africa