You are here: Home
/ Publication Information
Title: Exploiting the Achilles heels of pest invasions: allee effects, stratified dispersal and management of forest insect establishment and spread
Author: Liebhold, Andrew M.; Tobin, Patrick C.
Source: New Zealand Journal of Forestry Science. 40 suppl.: S25-S33.
Publication Series: Scientific Journal (JRNL)
Given the increasing problem of invasions by forest insects, there is an urgent need to develop effective strategies for managing them. Trends of escalating globalisation impede ongoing efforts to limit the arrival of new species. Consequently, either preventing establishment (through eradication) or limiting the spread of alien species are likely to play increasingly important roles. Here we argue that two traits common to many invading species can be exploited in the design of eradication and containment strategies. The first trait is the Allee effect, in which per capita growth rates decline with decreasing abundance. Allee effects can arise from several different mechanisms and are capable of driving low-density populations to extinction. Strategies to eradicate newly established populations should focus on either enhancing Allee effects or suppressing populations below Allee thresholds such that extinction proceeds without further intervention. The second trait is stratified dispersal, in which occasional long-distance dispersal results in the formation of isolated colonies ahead of the continuously infested range boundary. These colonies grow, coalesce and greatly increase spread rates. An efficient approach to containing the spread of invading species focuses on locating and eradicating these isolated colonies. Thus, Allee effects and stratified dispersal both represent 'weak links' in the invasion process that can be exploited in invasion management strategies.
Keywords: biosecurity, eradication, containment, biological invasion, population ecology
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
- This publication may be available in hard copy. Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact Sharon Hobrla, firstname.lastname@example.org if you notice any errors which make this publication unusable.
XML: View XML
Liebhold, Andrew M.; Tobin, Patrick C. 2010. Exploiting the Achilles heels of pest invasions: allee effects, stratified dispersal and management of forest insect establishment and spread. New Zealand Journal of Forestry Science 40 suppl.: S25-S33.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility