×

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

An assessment of the invasive status of Cytisus scoparius and Ulex europaeus in South Africa

An assessment of the invasive status of Cytisus scoparius and Ulex europaeus in South Africa
Philani Mbatha1 , Syd Ramdhani1, Sershen Naidoo1, John R. Wilson2 3, Kanyisa Jama2
1 University of KwaZulu-Natal; 2 Invasive Species Programme, SANBI; 3 Centre for Invasion Biology, Stellenbosch University

Cytisus scoparius  and  Ulex europaeus are  recognised invasive plants in  many countries. Both species have been recorded in South Africa since the 1930’s. However, empirical data on their invasion in South Africa are scarce. To shed light on this, the present study characterised known and newly identified populations of both species in terms of demographics and reproductive potential. Individual plants were counted and growth parameters (height, crown and basal stem diameters) were measured. Flowering, fruiting and seed set timing was recorded and measures of reproductive capacity were based on seed set, seed bank load and germinability (for C. scoparius). Seventeen (four invasive and 13 naturalized) populations of C. scoparius and three U. europaeus (one invasive and two naturalized) populations were identified, varying in size from 96 to 6841 individuals over 2.4 ha for C. scoparius and 52 to 1883 individuals over 1 ha for U. europaeus. These populations were found along roadsides and in natural and commercial forests. In both species individuals ≥0.5 m were reproductively active. Seed bank density and germinability for C. scoparius varied widely across sites. Dormancy breaking treatments applied to C. scoparius seeds showed that they exhibited physical dormancy, which once broken resulted in ±100% germination. Growth parameters appeared to be poorly related to reproductive output (R2  < 0.5). Competitive ability, relative growth rate, potential spread, management options and associated costs of both species are still to be determined. Both species appear to pose a substantial threat to South African biodiversity.

Read 3116 times

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