1. Faculty of Natural Sciences, Department of Community Extension, Mangosuthu University of Technology, Box 12363, Jacobs, Durban, 4026, South Africa
2. School of Life Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville, Pietermaritzburg, 3209 South Africa
3. Centre for Water Resources Research, School of Agriculture, Earth and Environmental Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville, Pietermaritzburg, 3209, South Africa