1 Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa. lukepotgieter2@gmail.com.
2 Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa.
3 Nürtingen-Geislingen University of Applied Sciences (HFWU), Schelmenwasen 4-8, 72622, Nürtingen, Germany.
4 Invasive Species Unit, Environmental Resource Management Department, City of Cape Town, Westlake Conservation Office, Cape Town, South Africa.
5 Natural Resources and Environment CSIR, P. O. Box 320, Stellenbosch, 7599, South Africa.
6 Percy FitzPatrick Institute of African Ornithology, University of Cape Town, Rondebosch, South Africa.
The original version of the article unfortunately contained an error with the figure captions. The appropriate captions for Fig. 3-6 are published accordingly. The original article has been corrected.