Invasive alien plants have a negative impact on ecosystem goods and services derived from ecosystems.
Consequently, the aggressive spread of invasive alien plants (IAPs) in the river catchments of South Africa
is a major threat to, inter alia, water security. The Olifants River catchment is one such a catchment that is
under pressure because of the high demand for water from mainly industrial sources and unsustainable
land-use, which includes IAPs. This study considered the cost-effectiveness of clearing IAPs and compared
these with the cost of a recently constructed dam. The methods used for data collection were semistructured
interviews, site observation, desktop data analysis, and a literature review to assess the impact of
IAPs on the catchment’s water supply. The outcomes of this study indicate that clearing invasive alien plants
is a cost-effective intervention with a Unit Reference Value (URV) of R1.44/m3, which compares very
favourably with that of the De Hoop dam, the URV for which is R2.93/m3. These results suggest that
clearing invasive alien plants is a cost-effective way of catchment management, as the opportunity cost of
not doing so (forfeiting water to the value of R2.93/m3) is higher than that of protecting the investment in the
Goyder, David J.; Barker, Nigel; Bester, Stoffel P.; Frisby, Arnold Walter; Janks, Matt; Gonçalves, Francisco M.P.(Pensoft Publishers, 2018-11-27)
This paper aims to provide a baseline for conservation planning by documenting patterns of plant diversity and vegetation in the upper catchment of the Cuito River. 417 species are recorded from this region. Nine of these ...
Biyase, Nokulunga Precious(University of Pretoria, 2014-12-31)
Water quality deterioration is a global issue which has a direct influence on water availability. It has been discovered that a decline in water quality is not only influenced by anthropogenic factors but the natural factors ...
Natural water resources are globally under pressure due to increasing population numbers and associated global change drivers, such as land-use and climate change. South Africa has a semi-arid climate, with variable patterns ...