Inferring Process from Pattern in Plant Invasions: A Semimechanistic Model Incorporating Propagule Pressure and Environmental Factors

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dc.contributor.authorRouget, Mathieu
dc.contributor.authorRichardson, David M
dc.date.accessioned2021-10-08T07:20:32Z
dc.date.available2021-10-08T07:20:32Z
dc.date.issued2003
dc.description.abstractAbstract: Propagule pressure is intuitively a key factor in biological invasions: increased availability of propagules increases the chances of establishment, persistence, naturalization, and invasion. The role of propagule pressure relative to disturbance and various environmental factors is, however, difficult to quantify. We explored the relative importance of factors driving invasions using detailed data on the distribution and percentage cover of alien tree species on South Africas Agulhas Plain (2,160 km2). Classification trees based on geology, climate, land use, and topography adequately explained distribution but not abundance (canopy cover) of three widespread invasive species (Acacia cyclops, Acacia saligna, and Pinus pinaster). A semimechanistic model was then developed to quantify the roles of propagule pressure and environmental heterogeneity in structuring invasion patterns. The intensity of propagule pressure (approximated by the distance from putative invasion foci) was a much better predictor of canopy cover than any environmental factor that was considered. The influence of environmental factors was then assessed on the residuals of the first model to determine how propagule pressure interacts with environmental factors. The mediating effect of environmental factors was species specific. Models combining propagule pressure and environmental factors successfully predicted more than 70% of the variation in canopy cover for each species.
dc.identifier.apacitationRouget, M., & Richardson, D. M. (2003). Inferring Process from Pattern in Plant Invasions: A Semimechanistic Model Incorporating Propagule Pressure and Environmental Factors. <i>The American Naturalist</i>, 162(6), 713 - 724. http://hdl.handle.net/11427/34949en_ZA
dc.identifier.chicagocitationRouget, Mathieu, and David M Richardson "Inferring Process from Pattern in Plant Invasions: A Semimechanistic Model Incorporating Propagule Pressure and Environmental Factors." <i>The American Naturalist</i> 162, 6. (2003): 713 - 724. http://hdl.handle.net/11427/34949en_ZA
dc.identifier.citationRouget, M. & Richardson, D.M. 2003. Inferring Process from Pattern in Plant Invasions: A Semimechanistic Model Incorporating Propagule Pressure and Environmental Factors. <i>The American Naturalist.</i> 162(6):713 - 724. http://hdl.handle.net/11427/34949en_ZA
dc.identifier.issn0003-0147
dc.identifier.issn1537-5323
dc.identifier.ris TY - Journal Article AU - Rouget, Mathieu AU - Richardson, David M AB - Abstract: Propagule pressure is intuitively a key factor in biological invasions: increased availability of propagules increases the chances of establishment, persistence, naturalization, and invasion. The role of propagule pressure relative to disturbance and various environmental factors is, however, difficult to quantify. We explored the relative importance of factors driving invasions using detailed data on the distribution and percentage cover of alien tree species on South Africas Agulhas Plain (2,160 km2). Classification trees based on geology, climate, land use, and topography adequately explained distribution but not abundance (canopy cover) of three widespread invasive species (Acacia cyclops, Acacia saligna, and Pinus pinaster). A semimechanistic model was then developed to quantify the roles of propagule pressure and environmental heterogeneity in structuring invasion patterns. The intensity of propagule pressure (approximated by the distance from putative invasion foci) was a much better predictor of canopy cover than any environmental factor that was considered. The influence of environmental factors was then assessed on the residuals of the first model to determine how propagule pressure interacts with environmental factors. The mediating effect of environmental factors was species specific. Models combining propagule pressure and environmental factors successfully predicted more than 70% of the variation in canopy cover for each species. DA - 2003 DB - OpenUCT DP - University of Cape Town IS - 6 J1 - The American Naturalist LK - https://open.uct.ac.za PY - 2003 SM - 0003-0147 SM - 1537-5323 T1 - Inferring Process from Pattern in Plant Invasions: A Semimechanistic Model Incorporating Propagule Pressure and Environmental Factors TI - Inferring Process from Pattern in Plant Invasions: A Semimechanistic Model Incorporating Propagule Pressure and Environmental Factors UR - http://hdl.handle.net/11427/34949 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34949
dc.identifier.vancouvercitationRouget M, Richardson DM. Inferring Process from Pattern in Plant Invasions: A Semimechanistic Model Incorporating Propagule Pressure and Environmental Factors. The American Naturalist. 2003;162(6):713 - 724. http://hdl.handle.net/11427/34949.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Biological Sciences
dc.publisher.facultyFaculty of Science
dc.sourceThe American Naturalist
dc.source.journalissue6
dc.source.journalvolume162
dc.source.pagination713 - 724
dc.source.urihttps://dx.doi.org/10.1086/379204
dc.subject.otherEnvironment
dc.subject.otherGeography
dc.subject.otherModels, Biological
dc.subject.otherPopulation Dynamics
dc.subject.otherSeedlings
dc.subject.otherSouth Africa
dc.subject.otherSpecies Specificity
dc.subject.otherTrees
dc.titleInferring Process from Pattern in Plant Invasions: A Semimechanistic Model Incorporating Propagule Pressure and Environmental Factors
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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