1. Department of Land and Water Resources Management, Midlands State University, Gweru, Zimbabwe
2. Department of Mathematics and Applied Statistics, Midlands State University, Gweru, Zimbabwe
3. Department of Geography, University of Sheffield, Sheffield, UK
4. Department of Mathematics and Statistical Sciences, Botswana International University of Science and Technology, Gaborone, Botswana
5. Department of Animal and Wildlife Sciences, Midlands State University, Gweru, Zimbabwe
6. School of Agricultural, Earth and Environmental Sciences University of Kwazulu Natal, Pietermaritzburg, South Africa