Impacts

Problem:

"There are very few studies that cover the combined impacts of invasive species on particular areas". – Van Wilgen, B.W. & Wilson, J.R. (Eds.) 2018. The status of biological invasions and their management in South Africa in 2017. South African National Biodiversity Institute, Kirstenbosch and DST-NRF Centre of Excellence for Invasion Biology, Stellenbosch.

Solutions:

  • Le Maitre et al (2019) calculated the impacts of different degrees of alien plant invasion on yields from the the Western Cape Water Supply System

  • Ntshidi et al. (2018) concluded that the water use of poplar invasions is significantly lower than that of other riparian invasions

  • Dzikiti et al. (2018) demonstrated that deep rooted indigenous trees growing in arid to semi-arid environments are equally likely to use as much or more water per plant than invasive alien plants.

  • Preston et al. (2018) investigated the impact of invasive alien plants on water provision in selected catchments

  • Le Maitre et al. (2016) estimated the impacts of invasive alien plants on water flows in South Africa

  • Dzikiti el at. (2016) quantified the savings from clearing invasive alien Eucalyptus camaldulensis using in situ and high resolution remote sensing data in the Berg River Catchment

  • Meijninger & Jarmain (2014) assessed the impact that invasive alien plants, and the clearing thereof by Working for Water, has on the availability of water resources in the Western Cape and KwaZulu-Natal provinces

  • Hope (2009) investigated the viability of relating annual river yields to remotely sensed changes in vegetation cover in a large mountainous fynbos catchment

  • Van Wilgen et al. (2008) conducted a biome-scale assessment of the impact of invasive alien plants on ecosystem services

  • Dye and Jarmain (2004) reviewed relevant available information on rates of evaporation from black wattle and from grasslands and fynbos shrublands

  • Dye et al. (2001) concluded that the removal of riparian wattle and its replacement by indigenous herbaceous plants may result in significant reductions in annual evapotranspiration, and could very likely lead to streamflow enhancement

  • Le Maitre et al. (2000) conducted a preliminary assessment of the impact of invading alien plants on surface water resources

  • Prinsloo and Scott (1999) describe the changes in streamflow following the removal of invasive wattle from riparian zones during the dry summer months in three small catchments in the Western Cape

  • Dye and Poulter (1995) conduced a field demonstration of the effect on streamflow of clearing invasive pine and wattle trees from a riparian zone