10.5061/DRYAD.GH21J
Blair, Amy C
Colorado State University
Blumenthal, Dana
United States Department of Agriculture
Hufbauer, Ruth A
Colorado State University
Data from: Hybridization and invasion: an experimental test with diffuse
knapweed (Centaurea diffusa Lam.)
Dryad
dataset
2011
Centaurea stoebe
Centaurea diffusa
2011-07-29T16:11:40Z
2011-07-29T16:11:40Z
en
https://doi.org/10.1111/j.1752-4571.2011.00203.x
113172 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
A number of studies have suggested a link between hybridization and
invasion. In this study, we experimentally test the potential for
hybridization to influence invasion through a greenhouse common garden
study. Diffuse knapweed (Centaurea diffusa Lam.) was introduced to North
America with admixture from spotted knapweed (Centaurea stoebe subsp.
stoebe L.). Comparisons between North American diffuse knapweed (including
hybrid phenotypes) and native (European) diffuse knapweed in a common
garden did not reveal enhanced performance or increased phenotypic
variance, suggesting that pre-introduction hybridization or, more
generally, post-introduction evolutionary change, has not significantly
contributed to the invasion of diffuse knapweed. In contrast, early
generation hybrids [artificially created Back Cross 1 (BC1) plants]
exhibited increased variance for eight of the examined traits, and greater
leaf and reproductive shoot production when compared to North American
diffuse knapweed. Individual BC1 lines differed for several traits,
suggesting the importance of the cross for drawing conclusions from such
comparisons. When compared to the parental species (diffuse and spotted
knapweed), the BC1 plants were not transgressive for any of the measured
traits. Overall, these findings suggest that if diploid spotted knapweed
is introduced to North America, interspecific hybridization has the
potential to result in even more aggressive invaders.
Blair_EvoApps_2011A more detailed description of the populations included
in the study with GPS coordinates can be found in Table 1 of the paper.
The plant class column is as follows: DK EU = diffuse knapweed of European
origin with no hybrids. DK NA = diffuse knapweed of North American origin
with hybrids found in the population. DK UA = diffuse knapweed populations
from the Ukraine with hybrids present. UA H was a hybrid swarm encountered
in the Ukraine that was not included in the publication. SK = diploid
spotted knapweed of European origin. BCC = the artificially created back
cross lines (A, B, and C). Competition column: y = plant grown with
western wheatgrass; n = plant grown alone; grass = the grass grown in the
pot. The life history and morphological traits are fairly self-explanatory
and explained in more detail in the paper and Table 2.
Europe
North America