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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

Composition, origins and distribution of the alien fauna of South Africa

Composition, origins and distribution of the alien fauna of South Africa
Michael PICKER1, Charles L. Griffiths2
1Department of Biological Sciences, University of Cape Town, Rondebosch 7700, Cape Town, South Africa
2Centre of Excellence for Invasion Biology, Department of Biological Sciences, University of Cape Town, Rondebosch 7700, Cape Town, South Africa

Study aims: To profile and compare the marine, freshwater and terrestrial alien fauna of South Africa, by providing a detailed breakdown of its species richness, taxonomic composition, patterns of geographical origins, modes or introduction,  geographic distributions, and impacts on local fauna.

Methods and data: The data used in the analysis are to be drawn from the 2011 book ‘Alien & Invasive animals’ (Picker and Griffiths). The detailed appendix is to be used as the primary database, as it is the most complete documentation of the freshwater, marine and terrestrial alien fauna of the region. For the 571 listed species, the appendix includes information on their origin, SA distribution and habitat. Using this database, with more detailed data in the text of the book, the following trends are analysed; hotspot analysis for alien species richness across SA, invaded habitat by taxon, relative importance of different taxa, species accumulation curves for increase in numbers of alien species since first introduction to 2011 for vertebrates and invertebrates, mode of introduction pathway (deliberate, accidental) for terrestrial, freshwater and marine introductions, and geographical source of introduction by taxon and habitat. For invertebrates the contribution of deliberate introductions for biocontrol purposes is included.

The scale and trends (invasion history, sources of alien fauna, profile of faunal species involved, habitats invaded) will provide a broad overview of the nature of the alien fauna of the region.

Read 3186 times Last modified on Tuesday, 03 May 2016 12:30

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