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The single mostly costly conservation intervention is the control of invaders. Here in the Crocodile River Reserve, the scourge of invaders threatens the entire grassland and the wetlands. Even the higher, less accessible areas of bushveld are under threat.
Invaders replace the natural plants, changing not only the rich variety of naturally occurring wildflowers, grasses and trees, but also the animals. Many other species rely on the plants for food and shelter. As the type of animal attracted to, or able to live off the natural vegetation changes, so does the selection of all other creatures. The ripple effect alters the entire “system”.
The legislation which descibes how invasive species must be dealt with is the National Environmental Management: Biodiversity Act. The Act has regulations and lists of invasive species associated with Categories. These categories indicate how the species need to be managed.