Influence of dispersal, stochasticity, and an Allee effect on the persistence of weed biocontrol introductions

Ian D. Jonsen*, Robert S. Bourchier, Jens Roland

*Corresponding author for this work

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

An important problem encountered in biocontrol is the failure of introduced populations to establish and persist. Recent biocontrol studies focus on the roles of environmental stochasticity and Allee effects in determining introduction persistence but few studies consider the role of dispersal. We use a spatially explicit simulation model that incorporates dispersal and spatio-temporally random population growth to show that elevated emigration rates can exacerbate the negative influences of environmental stochasticity and Allee effects on introduction persistence. However, successful immigration can compensate partly for the otherwise reduced persistence that occurs when environmental stochasticity is high. These results illustrate that dispersal can have antagonistic effects on the persistence of biocontrol introductions and failure to consider the dispersal ability and typical emigration rates of biocontrol agents may yield misleading predictions regarding successful establishment.

Original languageEnglish
Pages (from-to)521-526
Number of pages6
JournalEcological Modelling
Volume203
Issue number3-4
DOIs
Publication statusPublished - 10 May 2007
Externally publishedYes

Keywords

  • Emigration
  • Immigration
  • Invasion
  • Landscape
  • Simulation
  • Weed biocontrol

Fingerprint Dive into the research topics of 'Influence of dispersal, stochasticity, and an Allee effect on the persistence of weed biocontrol introductions'. Together they form a unique fingerprint.

Cite this