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    A Spatially Explicit Model of Mutualism

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    Author
    Lorenzen, Nico Peter
    Issue Date
    2015
    Advisor
    Bronstein, Judith
    
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    Show full item record
    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
    Mutualistic interactions are robust biological systems with unique population dynamics that result in the observed occurrences of numerous interacting populations. Theoretical models in the literature explain the population dynamics of species involved in mutualisms in terms of positive and negative density-dependent and density-independent factors. Historically, few models have included explicit space in the form of discrete habitat patches to explore how the population dynamics of mutualistic species contribute to patterns of mutualism persistence affected by factors including dispersal and changes in habitat quality. We develop mathematical models to describe population dynamics of two mutualist species across a two-patch network to analyze the effects of explicit space, habitat quality and species-specific colonization rates on persistence of a mutualist community. Immigration and emigration can each mitigate the effects of decreasing patch quality, with low levels of colonization into a poor patch and greater emigration from a poor patch allowing persistence across the greatest range of habitat qualities. Within a plant-pollinator framework, the stability of the mutualism was more sensitive to decreasing patch quality for the pollinator than equal decreases in plant-specific patch quality.
    Type
    text
    Electronic Thesis
    Degree Name
    B.S.
    Degree Level
    bachelors
    Degree Program
    Honors College
    Ecology & Evolutionary Biology
    Degree Grantor
    University of Arizona
    Collections
    Honors Theses

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