Biological control as an invasion process: disturbance and propagule pressure affect the invasion success of Lythrum salicaria biological control agents

Yeates, Alice G., Schooler, Shon S., Garono, Ralph J. and Buckley, Yvonne M. (2012) Biological control as an invasion process: disturbance and propagule pressure affect the invasion success of Lythrum salicaria biological control agents. Biological Invasions, 14 2: 255-271. doi:10.1007/s10530-011-0060-5


Author Yeates, Alice G.
Schooler, Shon S.
Garono, Ralph J.
Buckley, Yvonne M.
Title Biological control as an invasion process: disturbance and propagule pressure affect the invasion success of Lythrum salicaria biological control agents
Journal name Biological Invasions   Check publisher's open access policy
ISSN 1387-3547
1573-1464
Publication date 2012-02-01
Year available 2011
Sub-type Article (original research)
DOI 10.1007/s10530-011-0060-5
Volume 14
Issue 2
Start page 255
End page 271
Total pages 17
Place of publication Dordrecht, Netherlands
Publisher Springer
Language eng
Abstract Understanding the mechanisms behind the successful colonization and establishment of introduced species is important for both preventing the invasion of unwanted species and improving release programs for biological control agents. However, it is often not possible to determine important introduction details, such as date, number of organisms, and introduction location when examining factors affecting invasion success. Here we use biological control introduction data to assess the role of propagule pressure, disturbance, and residence time on invasion success of four herbivorous insect species introduced for the control of the invasive wetland plant, Lythrum salicaria, in the Columbia River Estuary. Two sets of field surveys determined persistence at prior release sites, colonization of new sites, and abundance within colonized sites. We quantified propagule pressure in four ways to examine the effect of different measurements. These included three measurements of introduction size (proximity to introduction site, introduction size at a local scale, and introduction size at a regional scale) and one measure of introduction number (number of introduction events in a region). Disturbance was examined along a tidal inundation gradient (distance from river mouth) and as habitat (island or mainland). Statistical models and model averaging were used to determine which factors were driving invasion success. In this study we found: (1) sparse evidence for the positive influence of propagule pressure on invasion success; (2) disturbance can negatively affect the invasion success of herbivorous insects; (3) the effects of disturbance and propagule pressure are species specific and vary among invasion stages, and (4) not all measures of propagule pressure show the same results, therefore single measures and proxies should be used cautiously.
Keyword G. pusilla
Galerucella calmariensis
Hylobius transversovittatus
Introduced alien species
Nanophyes marmoratus
Purple loosestrife
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 17 July 2011

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Biological Sciences Publications
 
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Created: Wed, 07 Sep 2011, 20:39:14 EST by Gail Walter on behalf of School of Biological Sciences