Biological Invasions

, Volume 13, Issue 7, pp 1649–1661 | Cite as

What are the key drivers of spread in invasive plants: dispersal, demography or landscape: and how can we use this knowledge to aid management?

  • Shaun R. Coutts
  • Rieks D. van Klinken
  • Hiroyuki Yokomizo
  • Yvonne M. Buckley
Original Paper

Abstract

Invasive plants disrupt ecosystems from local to landscape scales. Reduction or reversal of spread is an important goal of many invasive plant management strategies, but few general guidelines exist on how to achieve this aim. We identified the main drivers of spread, and thus potential targets for management, using a spatially explicit simulation model tested on different life history categories in different spread and landscape scenarios. We used boosted regression trees to determine the parameters that most affected spread. Additionally, we analysed how spread reacted to changes in those parameters over a broad realistic range. From our results we deduce four simple management guidelines: (1) Manage dispersal if possible, as mean dispersal distance was an important driver of spread for all life history categories; (2) short bursts of rapid spread or more usual year on year spread can have different drivers, therefore managers need to decide what type of spread they want to slow; (3) efforts to manage spread will have variable outcomes due to interactions between, and non-linear responses to, key drivers of spread; and (4) the most useful demographic rates to target depend on dispersal ability, life history and how spread is measured. Fecundity was found to be important for driving spread only when reduced to low levels and particularly when the species was short lived. For longer lived species management should target survival, or age of maturity, especially when dispersal ability is limited.

Keywords

Boosted regression trees Heterogeneous landscapes Plant dispersal Plant invasions Sensitivity analysis Simulation model 

Supplementary material

10530_2010_9922_MOESM1_ESM.pdf (134 kb)
Supplementary material 1 (PDF 133 kb)
10530_2010_9922_MOESM2_ESM.pdf (127 kb)
Supplementary material 2 (PDF 126 kb)
10530_2010_9922_MOESM3_ESM.pdf (181 kb)
Supplementary material 3 (PDF 181 kb)

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Shaun R. Coutts
    • 1
  • Rieks D. van Klinken
    • 2
  • Hiroyuki Yokomizo
    • 3
  • Yvonne M. Buckley
    • 1
    • 4
  1. 1.School of Biological SciencesUniversity of QueenslandSt LuciaAustralia
  2. 2.CSIRO EntomologyIndooroopillyAustralia
  3. 3.Research Center for Environmental RiskNational Institute for Environmental StudiesTsukubaJapan
  4. 4.CSIRO Ecosystem SciencesSt LuciaAustralia

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