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dc.contributor.authorTenhumberg, Brigitte
dc.contributor.authorSuwa, Tomomi
dc.contributor.authorTyre, Andrew J.
dc.contributor.authorRussell, F. Leland
dc.contributor.authorLouda, Svata M.
dc.date.accessioned2015-07-07T02:03:23Z
dc.date.available2015-07-07T02:03:23Z
dc.date.issued2015-04
dc.identifier.citationTenhumberg, B., T. Suwa, A. J. Tyre, F. L. Russell, and S. M. Louda. 2015. Integral projection models show exotic thistle is more limited than native thistle by ambient competition and herbivory. Ecosphere 6(4):69. http://dx.doi.org/10. 1890/ES14-00389.1en_US
dc.identifier.issn2150-8925
dc.identifier.otherWOS:000354777300024
dc.identifier.urihttp://dx.doi.org/10.1890/ES14-00389.1
dc.identifier.urihttp://hdl.handle.net/10057/11324
dc.descriptionCopyright: © Authors. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. http://creativecommons.org/licenses/by/3.0/en_US
dc.description.abstractBoth competitors and natural enemies can limit plant population growth. However, demographic comparisons of the effects of these interactions on introduced versus co-occurring, related native species are uncommon. We asked: (1) does plant competition, insect herbivory, or their combination reduce population growth rate, log lambda, of the Eurasian thistle Cirsium vulgare sufficiently to explain its limited invasiveness in western tallgrass prairie; and (2) how do the effects of these interactions compare to those for C. altissimum, its co-occurring, synchronously- flowering native congener? We developed integral projection models (IPMs) to estimate log lambda for both species, using parameter estimates from field experiments. Our models predicted that the growth potential (growth rate at minimal competition and herbivory) for the introduced thistle (log lambda = 3.5 (2.5, 4.6)) was twice as large as for the native thistle (log lambda = 1.6 (0.4, 3.1)); however, a high level of competition and ambient insect herbivory together reduced log k to similar values for both thistle species (C. vulgare: log lambda = -1.3 (-2.4, -0.3) vs C. altissimum: log lambda = -0.9 (-1.4, -0.3)). This suggests that the introduced thistle was more affected by competition and insect herbivory. For the introduced thistle, neither competition nor insect herbivory alone led to negative log k. In contrast, for the native thistle, high competition alone also led to negative population growth (log lambda = -0.8, percentile limits do not overlap with zero). Ambient herbivory alone prevented the spread for both thistle species (percentile limits include zero). Overall, the results show that interspecific competition followed by ambient levels of insect herbivory strongly constrained log k for both thistles, limiting C. vulgare invasiveness and C. altissimum abundance. The outcome highlights the importance of synergy between the two biological interactions in limiting plant population growth. Improved understanding of mechanisms limiting log k for weedy plants enhances our ability to predict when biotic resistance will contribute to invasive plant species management.en_US
dc.description.sponsorshipThe Nature Conservancy-Nebraska Chapter, a John Davidson Scholarship, University of Nebraska-Lincoln (UNL) Initiative for Ecological and Evolutionary Analysis, UNL School of Biological Sciences Special Funds, and The Center for the Great Plain Studies to T. Suwa; and, by N.S.F. grant DEB 0532018 and U.S.D.A. grant NRI-2005-35320-15379 to F. L. Russell and S. M. Louda.en_US
dc.language.isoen_USen_US
dc.publisherEcological Society of Americaen_US
dc.relation.ispartofseriesEcosphere;v.6:no.4
dc.subjectBiotic resistanceen_US
dc.subjectCirsium altissimumen_US
dc.subjectCirsium vulgareen_US
dc.subjectCongeneric speciesen_US
dc.subjectEnemy release hypothesisen_US
dc.subjectExotic speciesen_US
dc.subjectIntegral projection modelen_US
dc.subjectInvasive plantsen_US
dc.subjectNebraskaen_US
dc.subjectPopulation growth rateen_US
dc.subjectThistleen_US
dc.titleIntegral projection models show exotic thistle is more limited than native thistle by ambient competition and herbivoryen_US
dc.typeArticleen_US
dc.rights.holderCopyright Ecological Society of America. All rights reserved.


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