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Grasses as invasive plants in South Africa revisited : patterns, pathways and management

dc.contributor.authorVisser, Vernonen_ZA
dc.contributor.authorWilson, John R. U.en_ZA
dc.contributor.authorCanavan, Kimen_ZA
dc.contributor.authorCanavan, Susanen_ZA
dc.contributor.authorFish, Lynen_ZA
dc.contributor.authorLe Maitre, Daviden_ZA
dc.contributor.authorNänni, Ingriden_ZA
dc.contributor.authorMashau, Carolineen_ZA
dc.contributor.authorO’Connor, Timen_ZA
dc.contributor.authorIvey, Philipen_ZA
dc.contributor.authorKumschick, Sabrinaen_ZA
dc.contributor.authorRichardson, David M.en_ZA
dc.date.accessioned2018-07-26T14:06:01Z
dc.date.available2018-07-26T14:06:01Z
dc.date.issued2017
dc.identifier.citationVisser, V., et al. 2017. Grasses as invasive plants in South Africa revisited : patterns, pathways and management. Bothalia - African Biodiversity and Conservation, 47(2):a2169, doi:10.4102/abc.v47i2.2169
dc.identifier.issn2311-9284 (online)
dc.identifier.issn0006-8241 (print)
dc.identifier.otherdoi:10.4102/abc.v47i2.2169
dc.identifier.urihttp://hdl.handle.net/10019.1/104201
dc.descriptionCITATION: Visser, V., et al. 2017. Grasses as invasive plants in South Africa revisited : patterns, pathways and management. Bothalia - African Biodiversity and Conservation, 47(2):a2169, doi:10.4102/abc.v47i2.2169.
dc.descriptionThe original publication is available at http://abcjournal.org
dc.description.abstractBackground: In many countries around the world, the most damaging invasive plant species are grasses. However, the status of grass invasions in South Africa has not been documented recently. Objectives: To update Sue Milton’s 2004 review of grasses as invasive alien plants in South Africa, provide the first detailed species level inventory of alien grasses in South Africa and assess the invasion dynamics and management of the group. Method: We compiled the most comprehensive inventory of alien grasses in South Africa to date using recorded occurrences of alien grasses in the country from various literature and database sources. Using historical literature, we reviewed past efforts to introduce alien grasses into South Africa. We sourced information on the origins, uses, distributions and minimum residence times to investigate pathways and patterns of spatial extent. We identified alien grasses in South Africa that are having environmental and economic impacts and determined whether management options have been identified, and legislation created, for these species. Results: There are at least 256 alien grass species in the country, 37 of which have become invasive. Alien grass species richness increased most dramatically from the late 1800s to about 1940. Alien grass species that are not naturalised or invasive have much shorter residence times than those that have naturalised or become invasive. Most grasses were probably introduced for forage purposes, and a large number of alien grass species were trialled at pasture research stations. A large number of alien grass species in South Africa are of Eurasian origin, although more recent introductions include species from elsewhere in Africa and from Australasia. Alien grasses are most prevalent in the south-west of the country, and the Fynbos Biome has the most alien grasses and the most widespread species. We identified 11 species that have recorded environmental and economic impacts in the country. Few alien grasses have prescribed or researched management techniques. Moreover, current legislation neither adequately covers invasive species nor reflects the impacts and geographical extent of these species. Conclusion: South Africa has few invasive grass species, but there is much uncertainty regarding the identity, numbers of species, distributions, abundances and impacts of alien grasses. Although introductions of alien grasses have declined in recent decades, South Africa has a potentially large invasion debt. This highlights the need for continued monitoring and much greater investment in alien grass management, research and legislation.en_ZA
dc.description.urihttps://abcjournal.org/index.php/abc/article/view/2169
dc.format.extent29 pages
dc.language.isoen_ZAen_ZA
dc.publisherAOSIS Publishing
dc.subjectIntroduced organismsen_ZA
dc.subjectGrassesen_ZA
dc.titleGrasses as invasive plants in South Africa revisited : patterns, pathways and managementen_ZA
dc.typeArticleen_ZA
dc.description.versionPublisher's version
dc.rights.holderAuthors retain copyright


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