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Ecological interactions between insect herbivores and their host plant in a weed biocontrol system

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dc.contributor.advisor Cartar, Ralf
dc.contributor.advisor Bourchier, Rob
dc.contributor.author Crowe, Michael
dc.contributor.author University of Lethbridge. Faculty of Arts and Science
dc.date.accessioned 2008-04-04T16:20:24Z
dc.date.available 2008-04-04T16:20:24Z
dc.date.issued 2003
dc.identifier.uri http://hdl.handle.net/10133/637
dc.description vii, 97 leaves ; 29 cm en
dc.description.abstract The role of interspecific competition as a regulating force in natural populations has been controversial, especially for phytophagous insect communities. A series of manipulative experiments using enclosure cages were conducted to evaluate the role of interspecific competition between a weevil and a fly, two seed feeding agents released against spotted knapweed in North America. The fly, an inferior biological control agent, was the superior competitor. Consequences of the antagonistic interaction included reduced seed destruction compared to if just the weevil was released on its own. The role of plant phenology on insect herbivore density was also assessed. The implications of phenologyinduced variation in insect density were evaluated with respect to competition between the fly and the weevil and were found to be important. Hypotheses of four plantmediated mechanisms of interspecific competition were also tested. Results support resource preemption as a competitive mechanism. en
dc.language.iso en_US en
dc.publisher Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2003 en
dc.relation.ispartofseries Thesis (University of Lethbridge. Faculty of Arts and Science) en
dc.subject Insects as biological pest control agents -- Research en
dc.subject Nonmusic cds en
dc.subject Electronic dissertations en
dc.subject Dissertations, Academic en
dc.subject Competition (Biology) en
dc.subject Beetles en
dc.subject Flies en
dc.subject Spotted knapweed -- Biological control -- Research en
dc.title Ecological interactions between insect herbivores and their host plant in a weed biocontrol system en
dc.type Thesis en
dc.publisher.faculty Faculty of Arts and Science en
dc.publisher.department Department of Biological Sciences en

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