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dc.contributor.authorHui, C
dc.contributor.authorRichardson, DM
dc.contributor.authorRobertson, MP
dc.contributor.authorWilson, JRU
dc.contributor.authorYates, CJ
dc.date.accessioned2011-10-03T09:35:09Z
dc.date.available2011-10-03T09:35:09Z
dc.date.issued2011
dc.identifier.citationHui, C., Richardson, D.M., Robertson, M.P., Wilson, J.R.U. & Yates, C.J. (2011) Macroecology meets invasion ecology: linking the native distributions of Australian acacias to invasiveness. Diversity and Distributions, 17: 872-883.en
dc.identifier.issn1366-9516en
dc.identifier.urihttp://hdl.handle.net/123456789/955
dc.description.abstractAim Species’ native ranges reflect the net outcome of interactions between lifehistory strategies and biotic and abiotic influences over evolutionary time-scales. Differences in native ranges might be indicative both of relative historical performance and adaptability to new conditions. Consequently, the native ranges of successful invaders might have distinctive biogeographical characteristics. We test this hypothesis by (1) quantifying macroecological patterns of the entire assemblage of native taxa in Acacia subgenus Phyllodineae in Australia, (2) testing whether highly invasive taxa represent random samples from the patterns observed for the assemblage as a whole and (3) exploring the link between native geographical range and the position of species along the introductionnaturalization- invasion continuum. Location Australia and worldwide. Methods Three distributional metrics representing particular biogeographical characteristics of species’ native ranges – the logarithms of range size, percolation intercept and percolation exponent – were calculated by fitting a revised alpha hull to records from Australia’s Virtual Herbarium. Randomization and cascaded tests were used to compare these metrics for species at different stages of invasion. Results The macroecological patterns of the three distributional metrics displayed lognormal-like frequency distributions. Most invasive species had significantly lower percolation exponents and larger native ranges than expected from random draws from the entire assemblage of Australian acacias, but percolation intercepts were not significantly different. This can be explained by a selection bias at the early stages of invasion. Main conclusions The outcome of the natural experiment of transplanting many Australian acacias into novel environments is not random. While invasive species have a particular macroecological pattern, this can be explained by the observation that species with large native ranges and low percolation exponents (i.e. high population increase rate) are most likely to have been introduced and naturalized. Whether this pattern is an artefact of human selection or reflects a human bias towards selecting invasive species remains to be seen.en
dc.description.sponsorshipData on Australian Acacia species records are used with permission of the Council of Heads of Australian Herbaria, the custodian of Australia’s Virtual Herbarium. We acknowledge financial support from the DST-NRF Centre of Excellence for Invasion Biology and the Working for Water Programme through their collaborative project on ‘Research for Integrated Management of Invasive Alien Species’. The Oppenheimer Memorial Trust and Stellenbosch University funded the October 2010 Acacia workshop in Stellenbosch at which a preliminary version of this paper was presented. C.H. is supported by the NRF Blue Sky Programme and Subcommittee B fund at Stellenbosch University.en
dc.format.extent737176 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.subjectnative geographical rangeen
dc.subjectspatial scalesen
dc.subjectspecies range size distributionen
dc.subjectwattlesen
dc.titleMacroecology meets invasion ecology: linking the native distributions of Australian acacias to invasivenessen
dc.typeJournalArticlesen
dc.cibjournalDiversity and Distributionsen
dc.cibprojectLarge-scale patterns in diversityen


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