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Variation in herbivore-mediated indirect effects of an invasive plant on a native plant

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dc.contributor.author Russell, F. Leland
dc.contributor.author Louda, Svata M.
dc.contributor.author Rand, Tatyana A.
dc.contributor.author Kachman, Stephen D.
dc.date.accessioned 2011-03-15T17:02:09Z
dc.date.available 2011-03-15T17:02:09Z
dc.date.issued 2007-02
dc.identifier.issn 0012-9658
dc.identifier.uri http://hdl.handle.net/10057/3404
dc.description This 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.abstract Theory 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.iso en_US en_US
dc.relation.ispartofseries Ecology, 88(2), 2007, pp. 413–423
dc.subject Apparent competition en_US
dc.subject Associational defense en_US
dc.subject Biological control en_US
dc.subject Carduus nutans L. en_US
dc.subject Cirsium undulatum Spreng. en_US
dc.subject Insect herbivory en_US
dc.subject Invasive plants en_US
dc.subject Non-target effects en_US
dc.subject Rhinocyllus conicus en_US
dc.subject Thistle en_US
dc.subject Weeds en_US
dc.subject Weevil en_US
dc.title Variation in herbivore-mediated indirect effects of an invasive plant on a native plant en_US
dc.type Article en_US
dc.description.version Peer reviewed
dc.rights.holder © Ecological Society of America 2007

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