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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

Molecular ecology of Acacia dealbata: Implications for effective management of invasive populations

Molecular ecology of  Acacia dealbata: Implications for  effective management of  invasive populations
Heidi Hirsch1, David M. Richardson1, Fiona A. C. Impson2, Johannes J. Le Roux1
1Centre for Invasion Biology, Stellenbosch University; 2Plant Protection Research Institute

Knowledge on the native provenance(s) of invasive plants in conjunction with a better understanding of coevolutionary processes between plants and potential biocontrol agents in their native ranges can help to develop effective control and management strategies. In this context, comparative studies between native and invasive populations can be useful approaches to gain more knowledge on the introduction history, potential niche and / or evolutionary shifts in invasive populations. Our research focuses on the invasion success of Acacia dealbata Link (silver wattle), a tree native to eastern and southeastern Australia and Tasmania. Introduced as a fast growing tree for shelterbelts, shade, firewood or horticulture, silver wattle has naturalized and is now considered as invasive in several countries (e.g. Chile, India, Portugal, South Africa, Spain, and the United States). However, only limited information is currently available on the characteristics of these invasive populations and the factors facilitating its invasiveness in these new ranges. We will provide an overview of our planned research approaches that consider the worldwide invasion success of A. dealbata. In addition to different comparative population genetic studies between native and invasive populations, we will also investigate biogeographic and subspecies-related patterns within its native range. Furthermore, a phylogenetic approach, including potential biological control agents, will be used to provide information on coevolutionary processes and thus host-specificity. Results from our research will help to gain a better knowledge of the supporting factors of the invasiveness of A. dealbata and to develop improved management strategies.

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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