The potential range of Ailanthus altissima (tree of heaven) in South Africa : the roles of climate, land use and disturbance

Show simple item record Walker, Gareth A. Robertson, Mark P. Gaertner, Mirijam Gallien, Laure Richardson, David M. 2018-03-19T06:48:41Z 2017-12
dc.description.abstract Invasive trees are a major problem in South Africa. Many species are well established whereas others are still in the early stages of invasion. The management of invasive species is most cost effective at the early stages of invasion; it is thus essential to target and contain naturalizing invaders before they spread across the landscape. Multi-scale species distribution models (SDMs) provide useful insights to managers; they combine species-occurrence observations with climatic variables to predict potential distributions of alien species. Applying SDMs in human-dominated ecosystems is complicated because many factors associated with human actions interact in complex ways with climatic and edaphic factors to determine the potential suitability of sites for species. The aim of this study was to determine the degree to which a worldwide invader, A. altissima (Simaroubaceae) has occupied its potential range in South Africa, to identify areas at risk of future invasion. To do this we built a set of SDMs at both global and country scales using climatic, land use and human-footprint data. Climatic data best explained the distribution of A. altissima at the global scale whereas variables reflecting human-mediated disturbances were most influential at the national scale. Our analyses show the importance of human-mediated disturbances at a global scale and human occupancy at a country scale in determining the range limits of A. altissima. Populations of this tree species are already present in most parts of South Africa that are environmentally suitable for the species, and management actions need to focus on preventing increases in density in these areas. en_ZA
dc.description.department Zoology and Entomology en_ZA
dc.description.embargo 2018-12-16
dc.description.librarian hj2018 en_ZA
dc.description.sponsorship BTA Pipe Supplies and the DST-NRF Centre of Excellence for Invasion Biology. DMR acknowledges funding from the DST-NRF Centre of Excellence for Invasion Biology and the National Research Foundation of South Africa (Grant 85417). en_ZA
dc.description.uri en_ZA
dc.identifier.citation Walker, G.A., Robertson, M.P., Gaertner, M. et al. The potential range of Ailanthus altissima (tree of heaven) in South Africa: the roles of climate, land use and disturbance. Biological Invasions (2017) 19: 3675-3690. en_ZA
dc.identifier.issn 1573-1464 (online)
dc.identifier.issn 1387-3547 (print)
dc.identifier.other 10.1007/s10530-017-1597-8
dc.language.iso en en_ZA
dc.publisher Springer en_ZA
dc.rights © Springer International Publishing AG 2017. The original publication is available at : http://link.springer.comjournal/10530. en_ZA
dc.subject Biological invasions en_ZA
dc.subject Ensemble models en_ZA
dc.subject Invasive species en_ZA
dc.subject Early stages of invasion en_ZA
dc.subject Range filling en_ZA
dc.subject Species distribution model (SDM) en_ZA
dc.subject Spread potential en_ZA
dc.subject Tree invasions en_ZA
dc.subject Urban invasions en_ZA
dc.title The potential range of Ailanthus altissima (tree of heaven) in South Africa : the roles of climate, land use and disturbance en_ZA
dc.type Postprint Article en_ZA

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