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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

Species distribution modelling of selected invasive alien plant species in Namibia and Germany

Species  distribution  modelling  of  selected  invasive  alien  plant  species  in  Namibia  and Germany 
Ruben Ulbrich, Kwembeya E., Joubert D., De Cauwer V.
University of Namibia

Currently invasive alien plants in Namibia and Germany are regarded as of moderate importance. But without proper monitoring and awareness the situation could change quickly and dramatically. One option to estimate possible distributions of species is by using species distribution modelling. My master’s thesis will deal with the possible and potential distribution of four invasive alien plant taxa (Prosopis spp & Leucaena leucocephala in Namibia; Prunus serotina & Robinia pseudoacacia in Germany) as calculated using the programme Maxent. A comparison between the ranges from native occurrence data (North-America) and actual occurrence points in the receiver country in relation to the environmental setting will be done. The occurrence points were extracted from international databases (e.g. GBIF) and national herbaria (e.g. WIND). Different environmental variables were used: as examples for soil – dominant soils, organic material; for temperature – annual mean/maximum  of  warmest  month  /minimum  of  coldest  month;  for  precipitation  –  annual mean/wettest and driest month and quarter. Projections of possible distribution in the recipient range will be calculated using three different data-sets: 1) occurrence data only from the donor region; 2) occurrence data only from the receiver country; and 3) occurrence data of the four species from both the donor and receiver country. The knowledge of possible and potential distribution of Invasive Alien Plants could be used to prioritise the management of areas of high conservation value like national parks or conservancy areas.

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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