1. Centre for Invasion Biology, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
2. Department of Biological Sciences, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
3. Marine Research Institute, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
4. Department of Zoology and Entomology, Rhodes University, PO Box 94, Grahamstown 6140, South Africa
5. Branch Fisheries Management, Department of Agriculture, Forestry and Fisheries, Private Bag X2, Rogge Bay 8012, South Africa
6. Department of Oceanography, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
7. CSIRO Marine and Atmospheric Research, Private Bag 5, Wembley WA 6913, Australia
8. Nansen Tutu Centre for Environmental Research, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
9. South African Institute for Aquatic Biodiversity, Private Bag 1015, Grahamstown 6140, South Africa
10. Department of Zoology, Nelson Mandela Metropolitan University, PO Box 77000, Port Elizabeth 6031, South Africa
11. Department of Botany, Nelson Mandela Metropolitan University, PO Box 77000, Port Elizabeth 6031, South Africa