1. Earth Sciences, University of the Western Cape, Bellville, South Africa;
2. International Centre for Insect Physiology and Ecology, Geoinformation Unit, Nairobi, Kenya;
3. Faculty of Agriculture, Department of Agronomy, University of Khartoum, Khartoum, Sudan;
4. Geography, Environmental Studies and Tourism, University of the Western Cape, Bellville, South Africa