Abundance, rarity and invasion debt among exotic species in a patchy ecosystem

Bennett, Joseph R., Vellend, Mark, Lilley, Patrick L., Cornwell, William K. and Arcese, Peter (2013) Abundance, rarity and invasion debt among exotic species in a patchy ecosystem. Biological Invasions, 15 3: 707-716. doi:10.1007/s10530-012-0320-z


Author Bennett, Joseph R.
Vellend, Mark
Lilley, Patrick L.
Cornwell, William K.
Arcese, Peter
Title Abundance, rarity and invasion debt among exotic species in a patchy ecosystem
Journal name Biological Invasions   Check publisher's open access policy
ISSN 1387-3547
1573-1464
Publication date 2013-03-01
Sub-type Article (original research)
DOI 10.1007/s10530-012-0320-z
Volume 15
Issue 3
Start page 707
End page 716
Total pages 10
Place of publication Dordrecht, Netherlands
Publisher Springer
Language eng
Abstract Community assembly through species invasions is a long-term process, for which vital information regarding future trends can be contained in current patterns. Using comparative analyses of native and exotic plant assemblages from meadow patches on islands in British Columbia, Canada, we examined multiple lines of evidence for ‘invasion debt’, a latent expansion of exotic species populations. We show that: (1) short-dispersing species are underrepresented compared to their long-dispersing counterparts in exotic species only; (2) among species that are invasive elsewhere in North America, a greater proportion of long dispersers are common in the study area and a greater proportion of short dispersers are rare; and (3) time since arrival in the study region is positively related to number of occurrences in exotic species. In addition, we show that a suite of exotic species possesses the facility of rapid long-distance dispersal and ability to establish viable populations on even the most isolated and least disturbed patches. While some highly-dispersive exotic species can rapidly colonize new areas, short dispersers appear to exhibit invasion debt, with their potential distributions only being realized in the long term. Removing or even reducing populations of many rapid colonizers could be extremely difficult; however, for species exhibiting patterns most consistent with invasion debt, an opportunity exists for monitoring and removal to help reduce potential competition with native species.
Keyword Dispersal ability
Invasion debt
Forms of rarity
Garry oak ecosystem
Invasive species
Super-invaders
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Biological Sciences Publications
Official 2014 Collection
 
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