Journal article

Origin matters: diversity affects the performance of alien invasive species but not of native species

  • Sun, Yan Department of Biology, University of Fribourg, Switzerland - CABI, Rue des Grillons 1, 2800 Delémont, Switzerland
  • Müller-Schärer, Heinz Department of Biology, University of Fribourg, Switzerland
  • Maron, John L. Division of Biological Sciences, University of Montana, Missoula, USA
  • Schaffner, Urs CABI, Rue des Grillons 1, 2800 Delémont, Switzerland
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  • The American Naturalist. - 2015, vol. 185, no. 6, p. 725–736
English At local scales, it has often been found that invasibility decreases with increasing resident plant diversity. However, whether resident community diversity similarly resists invasion by alien versus native species is seldom studied. We examined this issue by invading constructed native plant assemblages that varied in species and functional richness with invasive alien or native Asteraceae species. Assemblages were also invaded with spotted knapweed, Centaurea stoebe, a native European aster that has been previously used in diversity-invasibility experiments in North America. We also conducted a field survey to explore the generality of the patterns generated from our experimental study. Both experimental and observational work revealed that increasing diversity reduced the performance of alien but not native invaders. Centaurea stoebe invading its native community performed poorly regardless of resident diversity, whereas in a parallel, previously published study conducted in North America, C. stoebe easily invaded low-diversity but not high-diversity assemblages. Our results suggest that diversity is an attribute of resident communities that makes them more or less susceptible to invasion by novel invasive alien but not native plant species.
Faculté des sciences et de médecine
Département de Biologie
  • English
Ecology and biodeversity
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