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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

Investigating the ecological recovery and the restoration of aquatic ecosystem integrity post successful biological control of alien aquatic weeds

Investigating the ecological recovery and the restoration of aquatic ecosystem integrity post successful biological control of alien aquatic weeds
Samuel N. MOTITSOE, Jaclyn M. Hill, Martin P. Hill, Julie A. Coetzee
Biological Control Research Group, Department of Zoology and Entomology, Rhodes University, Grahamstown, South Africa

The establishment of aquatic alien species has recently been recognized as the second major contributor to loss of ecosystem biodiversity after habitat loss. Reversing the impact of alien aquatic weeds would be of major benefit to the ecosystem following the recovery of indigenous biodiversity. In South Africa, studies have shown that biological control programme against floating water weeds has been largely successful, with effective control (where no other intervention is necessary) of water lettuce (Pistia stratiotes), red water fern (Azolla filiculoides) and Kariba weed (Salvinia molesta). However, despite successful host specificity testing, release and establishment of biological control agents and eventual effective control of multiple invasive aquatic plants, the indirect and long-term aquatic ecosystem effects of biological control are currently poorly understood. Therefore, this study is aimed at investigating the long-term ecological contribution post successful biological control of alien aquatic weeds. It is anticipated that this research will resolve some of the major uncertainties associated with biological control of aquatic weeds e.g. does successful biological control result in long-term (1) enhancement in aquatic biodiversity and/or changes in food webs (2) ecosystem recovery (i.e. healthier habitat and better water quality) and (3) promotion of ecosystem ecological benefits? Addressing the above-mentioned ecological concerns in a series of mesocosm experiments (invaded, controlled and reference study sites) with main focus on aquatic ecosystem biological components, this study will investigate the role and effectiveness of biological control in ecosystem integrity recovery, restoration and ultimately the provisioning of freshwater ecosystem services

Read 2838 times Last modified on Tuesday, 03 May 2016 12:23

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