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CITATION: Stohlgren, T.J. et al. 2011. Widespread plant species: Natives vs. aliens in our changing world. Biological Invasions, 13:1931-1944. doi:10.1007/s10530-011-0024-9The original publication is available at https://www.springer.com/journal/10530Estimates of the level of invasion for a
region are traditionally based on relative numbers of native and alien species. However, alien species
differ dramatically in the size of their invasive ranges.
Here we present the first study to quantify the level of
invasion for several regions of the world in terms of
the most widely distributed plant species (natives vs.
aliens). Aliens accounted for 51.3% of the 120 most
widely distributed plant species in North America,
43.3% in New South Wales (Australia), 34.2% in
Chile, 29.7% in Argentina, and 22.5% in the Republic
of South Africa. However, Europe had only 1% of
alien species among the most widespread species of
the flora. Across regions, alien species relative to
native species were either as well-distributed
(10 comparisons) or more widely distributed (5 comparisons). These striking patterns highlight the
profound contribution that widespread invasive alien
plants make to floristic dominance patterns across
different regions. Many of the most widespread
species are alien plants, and, in particular, Europe
and Asia appear as major contributors to the homogenization
of the floras in the Americas. We recommend
that spatial extent of invasion should be
explicitly incorporated in assessments of invasibility,
globalization, and risk assessments.Publisher’s versio
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