Save our indigenous fauna and flora!
Cape Town has a project to manage invasives. Their website is very informative and covers aquatic plants, terrestrial plants, and animals including birds. For Zandvlei the mallard ducks are a particular area of concern.
There is also an Early Detection and Rapid Response (EDRR) project.
You can help fight invasive species by joining the Spotter Network
More info and contact details: Cape Town Invasives