Modelling invasibility in endogenously oscillating tree populations: Timing of invasion matters

Research output: Contribution to journalArticle

Abstract

The timing of introduction of a new species into an ecosystem can be critical in determining the invasibility (i.e. the sensitivity to invasion) of a resident population. Here, we use an individual-based model to test how (1) the type of competition (symmetric versus asymmetric) and (2) seed masting influence the success of invasion by producing oscillatory dynamics in resident tree populations. We focus on a case where two species (one resident, one invader introduced at low density) do not differ in terms of competitive abilities. By varying the time of introduction of the invader, we show that oscillations in the resident population favour invasion, by creating "invasibility windows" during which resource is available for the invader due to transiently depressed resident population density. We discuss this result in the context of current knowledge on forest dynamics and invasions, emphasizing the importance of variability in population dynamics.

Details

Authors
External organisations
  • University of Guelph
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Ecology

Keywords

  • Exploitation competition, Forest model, Individual-based model, Invasion criteria, Oscillations, Species coexistence, Stochasticity
Original languageEnglish
Pages (from-to)219-231
Number of pages13
JournalBiological Invasions
Volume12
Issue number1
Publication statusPublished - 2009 Jan
Publication categoryResearch
Peer-reviewedYes
Externally publishedYes