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dc.contributor.authorDuncan, R.P.
dc.contributor.authorCassey, P.
dc.contributor.authorPigot, A.L.
dc.contributor.authorBlackburn, T.M.
dc.date.accessioned2019-07-29T06:50:25Z
dc.date.available2019-07-29T06:50:25Z
dc.date.issued2019
dc.identifier.citationDuncan, R.P., Cassey, P., Pigot, A.L. and Blackburn, T.M. (2019). A general model for alien species richness. Biological Invasions 21, 2665-2677.en_ZA
dc.identifier.urihttp://hdl.handle.net/123456789/2697
dc.description.abstractA key question in invasion biology is why some regions have more alien species than others. Here, we provide a general framework to answer this. We model alien species richness as a function of the number of species introduced (colonization pressure) and the probability that each species establishes, which is a function of propagule pressure (the number of introduction events and the number of individuals per event) and the probability that a founding individual leaves a surviving lineage (lineage survival probability). With this model we show that: (a) alien species richness is most sensitive to variation in colonization pressure; (b) heterogeneity in lineage survival probability lowers the probability of population establishment, implying alien richness should be lower in more spatially or temporally variable environments; (c) heterogeneity in lineage survival probability leads to higher alien richness when a given propagule pressure is divided into more introduction events, each involving fewer individuals; and (d) we cannot quantify how specific components, such as lineage survival probability, influence alien species richness without data on other components and knowledge of how these covary. Overall, the model provides novel insights into the factors influencing alien species richness, and shows why we expect anthropogenic effects to be critical to this.en_ZA
dc.language.isoenen_ZA
dc.subjectColonization pressureen_ZA
dc.subjectEstablishmenten_ZA
dc.subjectFounding populationen_ZA
dc.subjectInvasionen_ZA
dc.subjectLineage survivalen_ZA
dc.subjectPropagule pressureen_ZA
dc.titleA general model for alien species richnessen_ZA
dc.typeJournalArticlesen_ZA
dc.cibjournalBiological Invasionsen_ZA
dc.cibprojectNAen_ZA


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