Native versus exotic community patterns across three scales: roles of competition, environment and incomplete invasion

Bennett, Joseph R., Dunwiddie, Peter W., Giblin, David E. and Arcese, Peter (2012) Native versus exotic community patterns across three scales: roles of competition, environment and incomplete invasion. Perspectives in Plant Ecology Evolution and Systematics, 14 6: 381-392. doi:10.1016/j.ppees.2012.10.001

Author Bennett, Joseph R.
Dunwiddie, Peter W.
Giblin, David E.
Arcese, Peter
Total Author Count Override 4
Title Native versus exotic community patterns across three scales: roles of competition, environment and incomplete invasion
Journal name Perspectives in Plant Ecology Evolution and Systematics   Check publisher's open access policy
ISSN 1433-8319
Publication date 2012-12-20
Sub-type Article (original research)
DOI 10.1016/j.ppees.2012.10.001
Volume 14
Issue 6
Start page 381
End page 392
Total pages 12
Place of publication Loebdergraben, Jena, Germany
Publisher Urban und Fischer Verlag
Collection year 2013
Language eng
Abstract Three fundamental, interrelated questions in invasion ecology are: (1) to what extent do exotic species outcompete natives; (2) are native and exotic communities functionally similar or different; and (3) are differences in biogeographic patterns in native and exotic communities due to incomplete invasions among exotics? These questions are analogous to general questions in community ecology regarding the relative roles of competition, environmental response and dispersal limitation in community assembly. We addressed each of these questions for plant communities in discrete meadow patches, using analyses at three scales ranging from the landscape to microsites. A weak positive relationship between native and exotic species richness in microsites, and a predominance of positive correlations in abundance among native and exotic species pairs suggest that competition has been less important than other factors in determining native versus exotic abundance and community composition. In contrast, models of species richness and community compositional change across scales suggest native versus exotic community patterns are largely determined by a mix of scale-dependent concordant (shared positive or negative) and discordant relationships with environmental variables. In addition, detailed analyses of species-area and species-abundance relationships suggest ongoing expansion of exotic species populations, indicating that the assembly of the exotic community is in its early stages. Thus, while competition does not appear to strongly affect native versus exotic abundances and compositions at present, it may intensify in the future. Our results indicate that synoptic patterns in native versus exotic richness that have been previously attributed to a single cause may in fact be due to a complex mix of concordant and discordant responses to environmental factors across scales. They also suggest that conservation efforts aimed at promoting natives and reducing exotics should focus on the factors and scales for which such a response (i.e., promotion of high native and low exotic richness) can be expected.
Keyword Species richness
Exotic species
Redundancy analysis (RDA)
Species abundance distribution (SAD)
Species-area relationship (SAR)
Incomplete invasion
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
School of Biological Sciences Publications
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