1. Department of Botany and Zoology, University of Stellenbosch, Stellenbosch, South Africa
2. Centre for Statistics in Ecology, Environment and Conservation, Department of Statistical Sciences, University of Cape Town, Western Cape, South Africa
3. Biosciences, University of Exeter, Devon, United Kingdom
4. Greenpeace Germany, Hongkongstrasse 10, 20457 Hamburg, Germany, , , , ,