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dc.contributor.authorRussell, F. Leland
dc.contributor.authorLouda, Svata M.
dc.contributor.authorRand, Tatyana A.
dc.contributor.authorKachman, Stephen D.
dc.date.accessioned2011-03-15T17:02:09Z
dc.date.available2011-03-15T17:02:09Z
dc.date.issued2007-02
dc.identifier.issn0012-9658
dc.identifier.urihttp://hdl.handle.net/10057/3404
dc.descriptionThis is the authors' version of the work. It is posted here by permission of the publisher for personal use, not for redistribution. The definitive version was published in Ecology, 88(2), 2007, pp. 413–423.
dc.description.abstractTheory predicts that damage by a shared herbivore to a secondary host plant species may either be higher or lower in the vicinity of a preferred host plant species. To evaluate the importance of ecological factors, such as host plant proximity and density, in determining the direction and strength of such herbivore-mediated indirect effects, we quantified oviposition by the exotic weevil Rhinocyllus conicus on the native wavyleaf thistle Cirsium undulatum in midgrass prairie on loam soils in the upper Great Plains, USA. Over three years (2001–2003), the number of eggs laid by R. conicus on C. undulatum always decreased significantly with distance (0–220 m) from a musk thistle (Carduus nutans L.) patch. Neither the level of R. conicus oviposition on C. undulatum nor the strength of the distance effect was predicted by local musk thistle patch density or by local C. undulatum density (≤5m). The results suggest that high R. conicus egg loads on C. undulatum near musk thistle resulted from the native thistle’s co-occurrence with the coevolved preferred exotic host plant and not from the weevil’s response to local host plant density. Mean egg loads on C. undulatum also were greater at sites with higher R. conicus densities. We conclude that both preferred-plant proximity and shared herbivore density strongly affected the herbivoremediated indirect interaction, suggesting that such interactions are important pathways by which invasive exotic weeds can indirectly impact native plants.en_US
dc.language.isoen_USen_US
dc.relation.ispartofseriesEcology, 88(2), 2007, pp. 413–423
dc.subjectApparent competitionen_US
dc.subjectAssociational defenseen_US
dc.subjectBiological controlen_US
dc.subjectCarduus nutans L.en_US
dc.subjectCirsium undulatum Spreng.en_US
dc.subjectInsect herbivoryen_US
dc.subjectInvasive plantsen_US
dc.subjectNon-target effectsen_US
dc.subjectRhinocyllus conicusen_US
dc.subjectThistleen_US
dc.subjectWeedsen_US
dc.subjectWeevilen_US
dc.titleVariation in herbivore-mediated indirect effects of an invasive plant on a native planten_US
dc.typeArticleen_US
dc.description.versionPeer reviewed
dc.rights.holder© Ecological Society of America 2007


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