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Browsing by Subject "Invasive alien plants"

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An assessment of a community-based, forest restoration programme in Durban (eThekwini), South Africa

Author: Mugwedi, LF ; Rouget, M ; Egoh, Benis N ; Sershen ; Ramdhani, S ; Slotow, R Date: Jul 2017 The restoration of degraded forests to enhance biodiversity, ecosystem services, as well as climate change mitigation and adaptation is now a major priority in cities around the world. This study evaluated the success of the Buffelsdraai ... Read more
Bioenergy systems sustainability assessment & management (BIOSSAM) guidance portal for policy, decision and development support of integrated bioenergy supply interventions

Author: Stafford, William HL Date: Aug 2010 There is a growing recognition of the carrying capacity of natural systems and how these limits impact economic growth and development. As fossil fuels are being depleted, the era of cheap fossil fuels is ending and societies are more willing ... Read more
Clearing of invasive alien plants in South Africa: a preliminary assessment of costs and progress

Author: Marais, R ; Van Wilgen, BW ; Stevens, D Date: Jan 2004 This paper provides estimates of the costs of clearing important species of invasive alien plants, as well as of progress made with clearing, based on data from a recently developed GIS-based project information system. Before the deployment ... Read more
Costs and benefits of biological control of invasive alien plants in South Africa

Author: Van Wilgen, BW ; De Lange, Willem J Date: Aug 2011 This paper provides a brief review of the environmental and economic costs of invasive alien plants in South Africa as a background to assessments of returns on investment in weed biological control. The understanding of impacts and their ... Read more
Costs and benefits of biological control of invasive alien plants: case studies from South Africa

Author: Van Wilgen, BW ; De Wit, MP ; Anderson, HJ ; Le Maitre, David C ; Kotze, IM ; Ndala, S ; Brown, B ; Rapholo, MB Date: Jan 2004 Invasive alien species can have significant negative environmental and economic impacts. Such species are often controlled biologically by means of introducing host-specific insects or pathogens that can reduce the species' invasive potential. ... Read more
Economic assessment of the contribution of biological control to the management of invasive alien plants and to the protection of ecosystem services in South Africa

Author: De Lange, Willem J ; Van Wilgen, BW Date: Jul 2010 This study is a first attempt at a holistic economic evaluation of South African endeavours to manage invasive alien plants using biological control. The author’s focus was on the delivery of ecosystem services from habitats that are invaded ... Read more
The economics of landscape restoration: Benefits of controlling bush encroachment and invasive plant species in South Africa and Namibia

Author: Stafford, William HL ; Birch, C ; Etter, H ; Blanchard, Ryan ; Mudavanhu, S ; Angelstam, P ; Blignaut, J ; Ferreira, L ; Marais, C Date: Jan 2017 Bush encroachment and alien plant invasions alter the composition and/or balance of species in natural ecosystems and impact biodiversity, land productivity and water availability. Therefore, the appropriate control and management of bush ... Read more
Evidence, perceptions, and trade-offs associated with invasive alien plant control in the Table Mountain National Park, South Africa

Author: Van Wilgen, B Date: 2012 The Table Mountain National Park is a 265 km2 protected area embedded within a city of 3.5 million people. The park contains an extremely diverse flora with many endemic species, and has been granted World Heritage Site status in recognition ... Read more
Evolution of fire and invasive alien plant management practices in fynbos

Author: Van Wilgen, BW Date: Sep 2009 The history and development of fire and invasive alien plant management policies in fynbos during the 20th century are reviewed. Fire was initially condemned outright as a destructive force, but as its vital role became better understood, ... Read more
Fire management in Mediterranean-climate shrublands: a case study from the Cape fynbos, South Africa

Author: van Wilgen, BW ; Forsyth, GG ; de Klerk, H ; Das, Sonali ; Khuluse, S ; Schmitz, P Date: 2010 The authors used a spatial data base of fires within 10 protected areas covering >720 000 ha to examine the frequency, seasonality, size and cause of fires over four decades. Their study covered five fire climate zones and a range of mountain ... Read more
Impacts of alien plant invasions on water resources and yields from the Western Cape Water Supply System (WCWSS)

Author: Le Maitre, David C ; Görgens, A ; Howard, G ; Walker, N Date: Oct 2019 A key motivation for managing invasive alien plant (IAP) species is their impacts on streamflows, which, for the wetter half of South Africa, are about 970 m3·ha-1·a-1 or 1 444 mill. m3·a-1 (2.9% of naturalised mean annual runoff), comparable ... Read more
Impacts of invading alien plant species on water flows at stand and catchment scales

Author: Le Maitre, David C ; Gush, Mark B ; Dzikiti, Sebinasi Date: May 2015 There have been many studies of the diverse impacts of invasions by alien plants but few have assessed impacts on water resources. We reviewed the information on the impacts of invasions on surface runoff and groundwater resources at stand ... Read more
Impacts of invasive alien plants on water quality, with particular emphasis on South Africa

Author: Chamier, J ; Schachtschneider, K ; Le Maitre, David C ; Ashton, PJ ; Van Wilgen, BW Date: Apr 2012 We review the current state of knowledge of quantified impacts of invasive alien plants on water quality, with a focus on South Africa. In South Africa, over 200 introduced plant species are regarded as invasive. Many of these species are ... Read more
Impacts of plant invasions on terrestrial water flows in South Africa

Author: Le Maitre, David C ; Blignaut, JN ; Clulow, A ; Dzikiti, Sebinasi ; Everson, CS ; Gorgens, AHM ; Gush, Mark B Date: 2020 Considerable advances have been made since the first estimates of the impacts of invasive alien plants on water resources in the early 1990s. A large body of evidence shows that invasive alien plants can increase transpiration and evaporation ... Read more
Incorporating stakeholder preferences in the selection of technologies for using invasive alien plants as a bio-energy feedstock: applying the analytical hierarchy process

Author: De Lange, Willem J ; Stafford, William HL ; Forsyth, GG ; Le Maitre, David C Date: May 2012 Invasive alien plants (IAPs) impose significant social costs on the population of the Agulhas Plain region in South Africa due to their adverse impacts on ecosystem goods and services (decreased water supply and increased fire risk). While ... Read more
Invasive alien plants and South African rivers: a proposed approach to the prioritisation of control operations

Author: Van Wilgen, BW ; Nel, JL ; Rouget, M Date: 2007 Parallel initiatives in South Africa have been addressing the prioritisation and management of invasive alien plant species, the prioritisation of rivers for the conservation of biodiversity, and broad-scale planning for water resource ... Read more
Invasive alien plants and water resources in South Africa: current understanding, predictive ability and research challenges

Author: Gorgens, AHM ; Van Wilgen, BW Date: Jan 2004 Predictions that invasive alien Plants would use significant amounts of water were a major factor in the establishment of South Africa's Working for Water programme, which aims to protect water resources by clearing these plants. The predictions ... Read more
Invasive alien plants in South Africa: how well do we understand the ecological impacts?

Author: Richardson, DM ; Van Wilgen, BW Date: Jan 2004 This paper examines the evidence for the effects of invasive alien plants in natural and semi-natural ecosystems in South Africa. Invasive alien plants are concentrated in the Western Cape, along the eastern seaboard, and into the eastern ... Read more
Managing urban plant invasions: A multi-criteria prioritization approach

Author: Potgieter, LJ ; Gaertner, M ; Irlich, UM ; O’Farrell, Patrick J ; Stafford, L ; Vogt, H ; Richardson, DM Date: Dec 2018 Alien plant invasions in urban areas can have considerable impact on biodiversity and ecosystem services (ES). Managing urban plant invasions is particularly challenging given the complex interactions between ecological, economic and social ... Read more
Nitrogen dynamics in land cleared of alien vegetation (Acacia saligna) and impacts on groundwater at Riverlands Nature Reserve (Western Cape, South Africa)

Author: Jovanovic, Nebojsa ; Israel, S ; Tredoux, G ; Soltau, L ; Le Maitre, David C ; Rusinga, F ; Rozanov, A ; Van der Merwe, N Date: Jan 2009 Woody invading alien plants, many of which are nitrogen-fixing legumes (Fabaceae family), are currently cleared in South African catchments to reduce water loss and preserve streamflow, and for the restoration of the ecosystem. This study ... Read more

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