Disturbance, invasion and re-invasion: Managing the weed-shaped hole in disturbed ecosystems

Buckley, Y. M., Bolker, B. M. and Rees, M. (2007) Disturbance, invasion and re-invasion: Managing the weed-shaped hole in disturbed ecosystems. Ecology Letters, 10 9: 809-817. doi:10.1111/j.1461-0248.2007.01067.x


Author Buckley, Y. M.
Bolker, B. M.
Rees, M.
Title Disturbance, invasion and re-invasion: Managing the weed-shaped hole in disturbed ecosystems
Journal name Ecology Letters   Check publisher's open access policy
ISSN 1461-023X
Publication date 2007
Sub-type Article (original research)
DOI 10.1111/j.1461-0248.2007.01067.x
Volume 10
Issue 9
Start page 809
End page 817
Total pages 9
Editor Hochberg, M.
Place of publication Oxford
Publisher Blackwell Publishing
Collection year 2008
Language eng
Subject C1
270703 Terrestrial Ecology
770904 Control of pests and exotic species
Abstract We aim to develop a simple model to explore how disturbance and propagule pressure determine conditions for successful invasion in systems where recruitment occurs only in disturbed sites. Disturbance is often thought to favour invaders as it allows recruitment; however, the effects of disturbance are more complicated when it results in mortality of the invader. When disturbance rates in both invader occupied and unoccupied sites are the same, recruitment and mortality effects are exactly balanced, and successful invasion is independent of the disturbance regime. Differences in the disturbance rates between invader occupied and unoccupied sites can occur through invader modification or management of disturbance. Under these conditions, we found a novel mechanism for the generation of an Allee effect, which occurs when the invader promotes disturbance in sites it already occupies. When Allee effects occur one-off, large-scale disturbances can result in permanent, dramatic shifts in invader abundance; and conversely, reducing the population below a critical threshold can cause extinction.
Keyword Ecology
colonization
ecosystem engineer
heterogeneity
invader
Lantana camara
lattice model
Mimosa pigra
propagule pressure
weed management
Grass-fire Cycle
Biological Invasions
Northern Australia
Propagule Pressure
Mimosa-pigra
Model
Coexistence
Regimes
Pattern
Impact
Q-Index Code C1
Q-Index Status Confirmed Code

 
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Created: Mon, 18 Feb 2008, 14:38:04 EST