×

Warning

JUser: :_load: Unable to load user with ID: 504

Notice

Thank you for visiting our website.

Please note that the site is not fully functional at the moment as we are in the process of re-developing. We hope that you will find the available resources helpful in the meantime.

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

1 2 3 4 5 6 7

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

Freshwater crayfish invasions in South Africa

Freshwater crayfish invasions in South Africa
Ana L. NUNES1, 2, 3, Tsungai A. Zengeya4, G. John Measey1, Olaf L.F. Weyl2
1Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University
2Centre for Invasion Biology, South African Institute for Aquatic Biodiversity, Grahamstown
3Invasive Species Programme, South African National Biodiversity Institute, Kirstenbosch Research Centre
4South African National Biodiversity Institute, Pretoria National Botanical Gardens

No indigenous freshwater crayfish species exist in continental Africa, but several North American and Australian species have been introduced since the 1970s. In South Africa, four species of alien crayfish are listed under NEMBA’s National List of Invasive Freshwater Invertebrate Species: the Danube crayfish (Astacus leptodactylus), the common yabby (Cherax destructor), the Australian redclaw crayfish (Cherax quadricarinatus) and the marron (Cherax tenuimanus). Although freshwater crayfish have been reported as high-impact invaders that can cause serious negative environmental impacts, no detailed information exists on crayfish distribution, abundance and impacts in South Africa.

The aim of this study is to present an overall view of the current situation of crayfish invasions in South Africa, mostly by focusing on the Australian redclaw crayfish (C. quadricarinatus), the only species that appears to be present and widely distributed in some areas of South Africa. Here we show the results of initial crayfish surveys performed in South Africa and Swaziland, for which collapsible baited traps were set along water bodies, left overnight, and checked the following morning for crayfish presence. We report on the presence of established populations of C. quadricarinatus in Mpumalanga and in different areas of Swaziland.

We discuss the implications of these results regarding the potential impact of C. quadricarinatus on native biota and natural habitats. This information is essential to support the development and implementation of adequate action plans for the management and control of this invasive species in South Africa.

Read 4098 times Last modified on Tuesday, 03 May 2016 12:12

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