Invasive yellow water lilies (Nymphaea mexicana and hybrids) have invaded rivers, lakes and dams in South Africa. Dense infestations can increase siltation, block waterways and hamper recreational activities. Thick mats provide breeding grounds for mosquitoes and disrupt the aquatic environment by reducing light penetration. Rotting material increases nutrients and reduces oxygen in the water which can be fatal to fish. The degradation of water bodies reduces the biodiversity of the ecosystem.
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