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dc.contributor.authorRand, Tatyana A.
dc.contributor.authorRussell, F. Leland
dc.contributor.authorLouda, Svata M.
dc.date.accessioned2011-03-15T19:54:01Z
dc.date.available2011-03-15T19:54:01Z
dc.date.issued2004
dc.identifier.issn1550-2740
dc.identifier.urihttp://hdl.handle.net/10057/3409
dc.identifier.urihttp://dx.doi.org/10.1614/0890-037X(2004)018[1250:LVLIEO]2.0.CO;2
dc.description.abstractInsect-mediated indirect interactions between native plant species recently have been shown to be important determinants of plant performance in a number of ecological communities. However, the potential indirect effects of exotic plant invasion on native plant species are not well understood. We examined whether the presence or proximity of the targeted exotic weed, musk thistle, influences the magnitude of attack on native thistles by the introduced biological control, flowerhead weevil. At the local scale, we quantified weevil egg densities on heads of the native wavyleaf thistle growing at different distances (0 to 100 m) from patches of the exotic thistle. Densities were significantly higher when the native thistle occurred within, vs. 30 to 50 m or 80 to 100 m from, patches of the exotic thistle, indicating a strong local ‘‘spillover effect.’’ At larger scales, we measured egg densities on wavyleaf thistle within grassland landscapes (2.4 × 2.4 km²) with varying infestation densities of the invasive musk thistle. We found that egg densities increased significantly with increasing invasive thistle densities measured at larger site and landscape scales. Because flowerhead weevil feeding substantially reduces seed production of wavyleaf thistle, exotic thistle populations are likely to have indirect negative effects on these native thistles. Our results provide strong empirical evidence that exotic plants can increase the attack on native plant species by maintaining populations of a shared insect herbivore. This finding suggests that persistence of exotic weeds in less-successful biocontrol programs will magnify the nontarget effects of weed biocontrol insects.en_US
dc.language.isoen_USen_US
dc.publisherWeed Science Society of Americaen_US
dc.relation.ispartofseriesWeed Technology (2004), v.18:1250–1254
dc.subjectAssociational susceptibilityen_US
dc.subjectBiological controlen_US
dc.subjectIndirect effectsen_US
dc.subjectNontarget effectsen_US
dc.subjectSpillover effectsen_US
dc.subjectThistlesen_US
dc.titleLocal- vs. landscape-scale indirect effects of an invasive weed on native plantsen_US
dc.typeArticleen_US
dc.description.versionPeer reviewed
dc.rights.holder© Weed Science Society of America 2004


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