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| Macroinvertebrates. (2) |
| Rivers--South Africa. (2) |
| Theses--Ecology. (2) |
| Water quality management--South Africa. (2) |
| Amatikulu. (1) |
| Amatikulu/Nyoni Catchment. (1) |
| Anthropogenic activities. (1) |
| Catchment. (1) |
| Ecological integrity. (1) |
| Estuary. (1) |