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    Insect Behavior Determines Plant Distribution in Alpine Habitat

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    Author
    Alexandre, Nicolas M.
    Issue Date
    2015
    Advisor
    Whiteman, Noah
    
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    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Specialist leaf-mining fly Scaptomyza nigrita is a major herbivore of its host plant Cardamine cordifolia. Host plants are found along a gradient from sun-exposed bog to deep spruce shade habitat where herbivory decreases as shade increases. Prior studies have failed to support the hypothesis that plant quality determines plant distribution. A series of outdoor cage experiments utilizing a factorial design tested whether herbivore choice may instead drive plant distribution. It was found that adult female S. nigrita exhibited a significant preference for feeding and ovipositing on C. cordifolia leaves exposed to light, regardless of habitat origin of plant, leaf width, or presence of prior herbivore damage. This study does not support the phytocentric explanation that host plant distribution is determined by herbivore preference for plants based on their quality. My findings instead support the hypothesis that herbivores drive plant distributions into the shade by creating enemy-free space for host plants through their preference for light.
    Type
    text
    Electronic Thesis
    Degree Name
    B.S.
    Degree Level
    bachelors
    Degree Program
    Honors College
    Ecology & Evolutionary Biology
    Degree Grantor
    University of Arizona
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    Honors Theses
    Honors Theses

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