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Department of Conservation Ecology and Entomology, and Centre for Invasion Biology, Stellenbosch University, Matieland, South Africa

Department of Conservation Ecology and Entomology, Stellenbosch University, Matieland, South Africa; and Water Science Unit, Agricultural Research Council—Natural Resources and Engineering, Water Science Unit, Cedara, South Africa

Western Cape Department of Environmental Affairs and Development Planning, Cape Town City Centre, South Africa; and Water Services Association of Australia, Melbourne, Victoria, Australia

(corresponding author), Department of Conservation Ecology and Entomology, and Centre for Invasion Biology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa, [email protected]