y2019m09b20 20190926111800 assa nadine@assaf.org.za assa South African Journal of Science S. Afr. J. Sci 1996-7489 09262019 115 9/10 Marius Claassen Department of Geography, Geoinformatics and Meteorology, University of Pretoria, Pretoria, South Africa https://orcid.org/0000-0002-8006-2310 Gonçalo Zagalo-Pereira Foundation for Science and Technology, Lisbon, Portugal Ana Sofia Soares-Cordeiro Foundation for Science and Technology, Lisbon, Portugal Nikki Funke Natural Resources and the Environment, Council for Scientific and Industrial Research, Pretoria, South Africa Karen Nortje Natural Resources and the Environment, Council for Scientific and Industrial Research, Pretoria, South Africa http://orcid.org/0000-0002-1787-7162 09262019 1 10.17159/sajs.2016/crossmark sajs.co.za false 2019-03-03 2019-04-15 2019-09-26 https://creativecommons.org/licenses/by/4.0/ https://creativecommons.org/licenses/by/4.0/ 10.17159/sajs.2019/6114 20190926111800 https://www.sajs.co.za/article/view/6114 https://www.sajs.co.za/article/view/6114/8880 https://www.sajs.co.za/article/view/6114/8880 https://www.sajs.co.za/article/view/6114/8880 https://www.sajs.co.za/article/view/6114/8880 https://www.sajs.co.za/article/view/6114/8880 https://www.sajs.co.za/article/view/6114/8880 https://www.sajs.co.za/article/view/6114/8880