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German wasp | Vespula germanica

German wasp

Vespula germanica

Coral bush | Ardisia crenata

Coral bush

Ardisia crenata

Purple loosestrife | Lythrum salicaria

Purple loosestrife

Lythrum salicaria

Pom pom weed | Campuloclinium macrocephalum

Pom pom weed

Campuloclinium macrocephalum

Canarybird bush | Crotalaria agatiflora

Canarybird bush

Crotalaria agatiflora

Peanut butter cassia | Senna didymobotrya

Peanut butter cassia

Senna didymobotrya

Rubber vine | Cryptostegia grandiflora

Rubber vine

Cryptostegia grandiflora

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Environmental Programmes

In order to tackle our country’s socio-economic challenges, the government adopted the Outcomes based approach to improve government performance and providing focus on service delivery. find out more

The contribution of biocontrol of aquatic weeds to water and biodiversity

The contribution of biocontrol of aquatic weeds to water and biodiversity
Martin P. Hill1 and Julie A. Coetzee2
1Biological Control Research Group, Department of Zoology and Entomology, Rhodes University, P.O. Box 94, Grahamstown, 6140, South Africa
2Biological Control Research Group, Department of Botany, Rhodes University, P.O. Box 94, Grahamstown, 6140, South Africa

Aquatic ecosystems in South Africa are prone to invasion by several invasive alien aquatic weeds, most notably, Eichhornia crassipes (water hyacinth); Pistia stratiotes (water lettuce); Salvinia molesta (salvinia); Myriophyllum aquaticum (parrot’s feather), and Azolla filiculoides (red water fern). Despite their long history in South Africa, there are only a few studies on the impacts of these species on biodiversity and water loss, while the benefits of the biological control programme against these species has been poorly quantified.  We have used two case studies to show that water hyacinth in particular results in significant water loss, and another two case studies that show its negative impacts on aquatic biodiversity in the field. Further, in controlled large pool experiments, aquatic biodiversity was shown to recover relatively quickly (within one year) after the introduction of biological control on water lettuce. These studies provide justification for the control of invasive alien aquatic weeds in South Africa.  Thus, the long-term management of alien aquatic vegetation relies on the correct implementation of biological control for those species already in the country, and the prevention of other species entering South Africa.

Read 3057 times Last modified on Tuesday, 03 May 2016 12:13

General News Updates

2019 National Symposium on Biological Invasio…


This is your invitation to South Africa's 2019 National Symposium on Biological Invasions. The convention is hosted by the Centre for Invasion Biology (CIB), University of Stellenbosch, and the Biolo... Read more

2019 Invasive Species Training


During the past five years (2014-2018), ISSA invasive species trainers have trained 4 000 in the identification of invasive species and laws pertaining to invasive species across South Africa.  ... Read more

Alien Grass Working Group


Who are we? The South African National Alien Grass Working Group was jointly initiated by the South African Biodiversity Institute (SANBI) and the Centre for Excellence in Invasion Biology (C·I·B) in... Read more

Permits for planting indigenous Cynodon?


On 16 February, 2018, South Africa's Department of Environmental Affairs issued amendments to the regulations and lists relating to the National List of Invasive Species.  Updates to the draft&n... Read more

Invasive species training 2018 dates released


Interested in invasive species?  How much do you know about NEMBA invasive species compliance for landowners and organs of state? The South African Green Industries Council (SAGIC) have released... Read more

Communications post for Africa advertised


The Nature Conservancy has advertised a brand new post:  Communications Manager, Africa Region. Knowledge of invasive species and water would be an asset in this post. See details below:    Job Titl... Read more