Climate change and invasion by intracontinental range-expanding exotic plants: the role of biotic interactions

W.E. Morriën, T. Engelkes, M. Macel, A. Meisner, W.H. van der Putten

Research output: Contribution to journalArticleAcademicpeer-review

37 Citations (Scopus)

Abstract

Background and Aims In this Botanical Briefing we describe how the interactions between plants and their biotic environment can change during range-expansion within a continent and how this may influence plant invasiveness. Scope We address how mechanisms explaining intercontinental plant invasions by exotics (such as release from enemies) may also apply to climate-warming-induced range-expanding exotics within the same continent. We focus on above-ground and below-ground interactions of plants, enemies and symbionts, on plant defences, and on nutrient cycling. Conclusions Range-expansion by plants may result in above-ground and below-ground enemy release. This enemy release can be due to the higher dispersal capacity of plants than of natural enemies. Moreover, lower-latitudinal plants can have higher defence levels than plants from temperate regions, making them better defended against herbivory. In a world that contains fewer enemies, exotic plants will experience less selection pressure to maintain high levels of defensive secondary metabolites. Range-expanders potentially affect ecosystem processes, such as nutrient cycling. These features are quite comparable with what is known of intercontinental invasive exotic plants. However, intracontinental range-expanding plants will have ongoing gene-flow between the newly established populations and the populations in the native range. This is a major difference from intercontinental invasive exotic plants, which become more severely disconnected from their source populations.
Original languageEnglish
Pages (from-to)843-848
JournalAnnals of Botany
Volume105
Issue number6
DOIs
Publication statusPublished - 2010

Keywords

  • enemy release hypothesis
  • nonnative plants
  • natural enemies
  • herbivores
  • evolution
  • responses
  • litter
  • decomposition
  • communities
  • mutualisms

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