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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

Where are the invaders hiding? Insights on the compilation of species and occurrence data for alien plants in small urban areas: Examples from Riebeek Kasteel, Western Cape, South Africa

Where are the invaders hiding? Insights on the compilation of species and occurrence data for alien plants in small urban areas: Examples from Riebeek Kasteel, Western Cape, South Africa
Phil McLEAN1,2, David M. Richardson1, John R. Wilson1,2, Mirijam Gaertner1,3
1DST-NRF Centre of Excellence for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
2Invasive Species Programme, South African National Biodiversity Institute, Kirstenbosch National Botanical Gardens, Private Bag X7, Claremont 7735, South Africa
3Invasive Species Unit (ISU), Environmental Resource Management Department (ERMD), Westlake Conservation Office, Ou Kaapse Weg, Postal address: Invasive Species Unit, Postnet Suite 80, Private Bag X26Tokai, 7966

More than half the world’s population live in towns or cities. Among urban environments, small urban centres (towns) that harbour invasive species have a large edge-effect that exposes the surrounding natural environment to elevated levels of invasive propagule pressure. Despite this threat, there are very few studies globally that investigate any patterns and processes evident in alien invasions within urban environments. For this study, I undertook a detailed analysis of the invasive species load (type, number and location) within the small urban centre of Riebeek Kasteel in the Berg River Catchment, Western Cape, South Africa. Total numbers of all alien woody and succulent plant species were recorded at 10m intervals on every road surface throughout the town and further categorised by land-use type. The status of invasion Riebeek Kasteel is comprehensively mapped and analysis of the data reveals hypotheses around the density, location and possible spread of alien plant taxa within this town. Lessons learned allow the search methodology to be refined and these hypotheses tested on other small urban centres in the catchment to determine whether trends are uniform across towns or particular to them. This has application for determining how and where to search for similar species or growth forms in other small towns as well as how much search effort is required to sufficiently determine a given town’s invasive species ‘load’. 

Read 2791 times Last modified on Tuesday, 03 May 2016 12:15

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