1. Department of Agronomy and Horticulture, University of Nebraska, Lincoln, United States
2. Scientific Services, South African National Parks, Skukuza, South Africa
3. Soil, Crop and Climate Sciences Department, University of the Free State, Bloemfontein, South Africa
4. United States Department of Agriculture, Agricultural Research Service, Sidney, United States
5. Ecology and Conservation Biology, Texas A&M University, College Station, United States
6. Texas A&M AgriLife Research Center, Texas A&M University, Sonora, United States
7. Department of Zoology and Entomology, University of Pretoria, Pretoria, South Africa
8. Conservation Management, South African National Parks, Skukuza, South Africa
9. School of Natural Resource Management, Nelson Mandela University, George, South Africa