Oecologia

, Volume 162, Issue 2, pp 371–381

Effects of genotype identity and diversity on the invasiveness and invasibility of plant populations

  • Mark Vellend
  • Emily B. M. Drummond
  • Hiroshi Tomimatsu
Population ecology - Original Paper

Abstract

Genetic diversity within species is a potentially important, but poorly studied, determinant of plant community dynamics. Here we report experiments testing the influence of genotype identity and genotypic diversity both on the invasibility of a foundation, matrix-forming species (Kentucky bluegrass, Poa pratensis), and on the invasiveness of a colonizing species (dandelion, Taraxacum officinale). Genotypes of Kentucky bluegrass in monoculture showed significant variation in productivity and resistance to dandelion invasion, but the productivity and invasion resistance of genotypic mixtures were not significantly different from those of genotypic monocultures. Indirect evidence suggested temporal shifts in the genotypic composition of mixtures. Dandelion genotypes in monoculture showed striking and significant variation in productivity and seed production, but there was no significant tendency for these variables in mixtures to deviate from null expectations based on monocultures. However, productivity and seed production of dandelion mixtures were consistently greater than those of the two least productive genotypes, and statistically indistinguishable from those of the three most productive genotypes, suggesting the possibility of greater invasiveness of genotypically diverse populations in the long run due to dominance by highly productive genotypes. In both experiments, the identity of genotypes was far more important than genetic diversity per se.

Keywords

Community genetics Competition Genetic diversity Invasion Species interactions 

Supplementary material

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Supplementary material 1 (DOC 41 kb)
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Supplementary material 3 (DOC 33 kb)
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Supplementary material 7 (DOC 39 kb)

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Mark Vellend
    • 1
  • Emily B. M. Drummond
    • 1
  • Hiroshi Tomimatsu
    • 1
  1. 1.Departments of Botany and Zoology, Biodiversity Research CentreUniversity of British ColumbiaVancouverCanada

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