Increased population growth rate in invasive polyploid Centaurea stoebe in a common garden

Hahn, Min A., Buckley, Yvonne M. and Mueller-Schaerer, Heinz (2012) Increased population growth rate in invasive polyploid Centaurea stoebe in a common garden. Ecology Letters, 15 9: 947-954. doi:10.1111/j.1461-0248.2012.01813.x

Author Hahn, Min A.
Buckley, Yvonne M.
Mueller-Schaerer, Heinz
Title Increased population growth rate in invasive polyploid Centaurea stoebe in a common garden
Journal name Ecology Letters   Check publisher's open access policy
ISSN 1461-023X
Publication date 2012-09
Sub-type Article (original research)
DOI 10.1111/j.1461-0248.2012.01813.x
Volume 15
Issue 9
Start page 947
End page 954
Total pages 8
Place of publication Oxford, United Kingdom
Publisher Wiley-Blackwell Publishing
Collection year 2013
Language eng
Formatted abstract
Biological invasions are inherently demographic processes, but trait differences between native and introduced genotypes are rarely linked to population growth rates. Native European Centaurea stoebe occurs as two cytotypes with different life histories (monocarpic diploids, polycarpic tetraploids); however, only tetraploids have been found in its introduced range in North America. In a common garden experiment using artificial populations, we compared the demographic performance of the three geo-cytotypes in the presence and absence of a specialist herbivore using periodic matrix models. We found no difference in population growth rate between the two European cytotypes and no significant effects of herbivory in all geo-cytotypes. However, there was a pronounced increase in population growth rate for North American compared with European tetraploids due to increased seed production and juvenile establishment. These results suggest that genetic drift or rapid evolution, rather than pre-adaptation through polyploidy may explain the invasion success of tetraploids.
Keyword Centaurea stoebe
Invasive species
Life history
Life table response experiments
Periodic matrix model
Rapid evolution
Specialist herbivores
Spotted knapweed
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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Created: Sat, 15 Sep 2012, 15:56:16 EST by Gail Walter on behalf of School of Biological Sciences