Non-indigenous ungulates as a threat to biodiversity

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dc.contributor.authorSpear, D.en_ZA
dc.contributor.authorChown, Steven L.en_ZA
dc.date.accessioned2011-05-15T15:59:52Z
dc.date.available2011-05-15T15:59:52Z
dc.date.issued2009-07
dc.descriptionCITATION: Spear, D. & Chown, S. L. 2009. Non-indigenous ungulates as a threat to biodiversity. Journal of Zoology, 279(1):1-7, doi:10.1111/j.1469-7998.2009.00604.x.
dc.descriptionThe original publication is available at https://zslpublications.onlinelibrary.wiley.com
dc.description.abstractNon-indigenous ungulate species pose a problem for conservation. They can be socially and economically valuable, but are also potentially harmful to biodiversity. Therefore, their introduction requires an explicit assessment of risk relative to benefit. To conduct such risk assessments, information regarding the impacts of non-indigenous ungulates on biodiversity is required. Here, we review the available evidence for the biodiversity impacts of non-indigenous ungulates. Hybridization, exploitation and apparent competition, vegetation impacts, predation, facilitation, trophic cascades and soil system functioning were assessed using a hierarchical set of criteria for the strength of the evidence. Strong evidence was lacking for risks posed by competition. Numerous reports exist of hybridization in captivity between ungulate species that normally do not co-occur, but conclusive evidence for introgression in the wild was restricted to one case. Strong evidence (using exclosure experiments) for the impacts of introduced ungulates on vegetation structure and composition was found and in some cases introduced ungulates caused the extirpation of plant species. Predation by Sus scrofa is a substantial threat to island faunas and systems, and impacts on soil system functioning elsewhere have also been found. Facilitation by ungulates has been shown to be substantial in promoting invasive plant species. By contrast, little evidence exists for apparent competition. The largest impacts from introduced ungulates are likely to be in cases where they perform novel functions in the new environment. However, to determine which types of impacts are likely to be most problematic, further evidence is required, ideally from well-designed field experiments. © 2009 The Zoological Society of London.en_ZA
dc.description.versionPublishers' Versionen_ZA
dc.format.extent17 p. : maps
dc.identifier.citationSpear, D. & Chown, S. L. 2009. Non-indigenous ungulates as a threat to biodiversity. Journal of Zoology, 279(1):1-7, doi:10.1111/j.1469-7998.2009.00604.xen_ZA
dc.identifier.issn1469-7998 (online)
dc.identifier.issn0952-8369 (print)
dc.identifier.otherdoi:10.1111/j.1469-7998.2009.00604.x
dc.identifier.urihttp://hdl.handle.net/10019.1/11407
dc.publisherWiley-Blackwellen_ZA
dc.rights.holderWiley-Blackwellen_ZA
dc.subjectEcosystem functionen_ZA
dc.subjectNon-indigenous ungulates -- Biodiversity impactsen_ZA
dc.subjectNon-indigenous ungulatesen_ZA
dc.subjectVegetation structureen_ZA
dc.titleNon-indigenous ungulates as a threat to biodiversityen_ZA
dc.typeArticleen_ZA
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