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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

Exploring the mechanisms of submerged invasions in South Africa: Case study on Egeria densa

Exploring the mechanisms of submerged invasions in South Africa: Case study on Egeria densa
Emily Strange, Julie A. Coetzee, Jackie M. Hill
Zoology and Entomology Department, Rhodes University, Grahamstown

South Africa’s long history with floating invasive macrophytes has led to a large body of research into this field, whereas submerged invasive macrophyte studies are far fewer. This study aims to understand the driving mechanisms underlying Egeria densa Planch (Hydrocharitaceae) invasions in South Africa, by investigating the ability of this species as a resource competitor against submerged native species, helping to predict where it is likely to establish and to what degree of success. This will enable informed management decisions, including the importation and potential release of the leaf mining fly Hydrellia sp. nv.; a promising biological control agent. To further understand the mechanisms of submerged macrophyte invasions, this study will explore the role of alternate stable states. If shifts from invasive floating stable states can result in invasive submerged stable states, the rapid control of floating plants could be the catalyst promoting the invasion of E. densa in South Africa. This would provide an opportunity for systems to be purposefully managed to induce shifts promoting native submerged stable states. Furthermore this project aims to use the application of stable isotope tracing to measure the functional response of E. densa in intraspecific and interspecific contexts. This project aims to investigate the ecology of E. densa with the end goal of improving predictions of establishment and success, leading to more efficient management.

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General News Updates

2019 National Symposium on Biological Invasio…

26-02-2019

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

22-01-2019

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

04-09-2018

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?

01-03-2018

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

28-02-2018

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

25-01-2018

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