A Community's Natural Resistance to Invasion by Cheatgrass and the Effects of Associational Herbivory
Beckstead, Julie
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https://hdl.handle.net/2142/87023
Description
Title
A Community's Natural Resistance to Invasion by Cheatgrass and the Effects of Associational Herbivory
Author(s)
Beckstead, Julie
Issue Date
2001
Doctoral Committee Chair(s)
Augspurger, Carol K.
Department of Study
Plant Biology
Discipline
Plant Biology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Biology, Ecology
Language
eng
Abstract
Linking theories of invasion biology with that of associational herbivory, I found that (1) cheatgrass was a highly utilized food source for generalist grasshoppers, (2) among native plant species, the amount of herbivory corresponded with their total percent nitrogen and other plant traits, and (3) a native grass, Elymus elymoides, experienced higher herbivory in high- than in low-density cheatgrass patches, supporting the attractant-source hypothesis that predicts associational susceptibility. Through indirect effects, invading species may generate important shifts in herbivory on native species.
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