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  • Evolutionary and ecological interactions affecting seaweeds

    Creator:
    Olson, Annette M.
    Abstract:
    The term "interaction" in evolutionary biology and ecology describes the relationships among variables in two classes of causal models. In the first, "interaction" refers to the influence of a single putatively causal variable on a variable of interest. In the second class of models, the term applies when a third...
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    Dissertation
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    Abstract approved: Jane Lubchenco The term "interaction" in evolutionary biology and ecology describes

  • The genus Caenorhabditis : a system for testing evolutionary questions

    Creator:
    Raboin, Michael J.
    Abstract:
    Caenorhabditis elegans is arguably the best understood animal on the planet. Used for over 50 years to study development, we have a vast amount of knowledge of the inner workings of this worm. Our knowledge is incomplete, however, without placing this organism in its evolutionary and ecological context. In this...
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    Dissertation
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    . Title: The Genus Caenorhabditis : A System for Testing Evolutionary Questions Abstract approved

  • The evolutionary stability of partial migration

    Creator:
    Ohms, Haley A.
    Abstract:
    Natural selection, in its most basic form, is described as a process in which traitsincrease or decrease in frequency depending on their fitness, and only the trait withthe highest fitness will remain in the population. Yet, populations rarely have asingle `optimal' trait. The way natural selection maintains this observed variationwithin...
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    Dissertation
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    of evolutionary ecology (Fisher 1930). An excel- lent system to investigate the evolution and

  • Multiagent learning for locomotion and coordination in tensegrity robotics

    Creator:
    Iscen, Atil
    Abstract:
    Tensegrity structures are composed of pure compressional elements that are connected via a network of pure tensional elements. The concept of tensegrity promises numerous advantages to the field of robotics. Tensegrity robots are, however, notoriously difficult to control due to their oscillatory nature and nonlinear interaction between the components. Multiagent...
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    Dissertation
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    - proaches (Reinforcement Learning and Evolutionary Algorithms) to tensegrity robotics problems at different

  • Evolutionary history and speciation of the genus Tragopan

    Creator:
    Islam, Kamal
    Abstract:
    A study of the phyletic relationships among five species of tragopans and an outgroup, the Blood Pheasant (Ithaginis cruentus), was conducted from 1987 to 1991. Biochemical, behavioral, and external morphologic characteristics were compared. A cladistic approach was used to compare the behavioral, biochemical, and external morphologic data collectively, as different...
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    Dissertation
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    Evolutionary history and speciation of the genus Tragopan

  • Investigating Demographic and Evolutionary Factors Important for Fish Reintroduction

    Creator:
    Sard, Nicholas M.
    Abstract:
    Reintroduction programs are used to re-establish species back into their historical habitat. Most reintroduction programs have failed and few papers have evaluated factors that may be important to Pacific salmon. The 158 meter tall Cougar Dam has blocked Chinook salmon (Oncorhynchus tshawytscha) from accessing 40 kilometers of historical spawning and...
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    Dissertation
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    : Investigating Demographic and Evolutionary Factors Important for Fish Reintroduction Abstract approved

  • Evolutionary relationships and an investigation of sympatric speciation within Limnanthaceae

    Creator:
    Meyers, Stephen C.
    Abstract:
    Limnanthes floccosa ssp. floccosa and L. floccosa ssp. grandiflora are two of five subspecies of Limnanthes floccosa endemic to vernal pools in southern Oregon and northern California. Three seasons of monitoring natural populations have quantified that L. floccosa ssp. grandiflora is always found growing sympatrically with L. floccosa ssp. floccosa...
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    Dissertation
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    for plant systematic research and the Leslie and Vera Gottlieb research fund in evolutionary biology

  • Evolutionary Dynamics of Genomes and Endosymbionts in Plant-Parasitic Nematodes

    Creator:
    Wasala, Wasala Mudiyanselage Sulochana K.
    Abstract:
    Plant-parasitic nematodes cause more than US $100 billion in annual agriculture loss worldwide. Thorough knowledge of their genetic diversity, and interactions with endosymbionts and environment have the potential to provide valuable insights into the basic biology of these animals, and assist future efforts aimed at management of these plant parasites....
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    Dissertation
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    Biology presented on June 1, 2020. Title: Evolutionary Dynamics of Genomes and Endosymbionts in Plant

  • Multi-Objective Optimization in Multiagent Systems

    Creator:
    Yliniemi, Logan Michael
    Abstract:
    Cooperative multiagent systems are used as solution concepts in many application domains including air traffic control, satellite communications, and extra planetary exploration. As systems become more distributed and complex, we observe three phenomena. First, these systems cannot be accurately modeled, rendering traditional model based control methods inadequate. Second, system parameters...
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    Dissertation
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    not treated as such in most multiagent research. To date, there has been little research attention

  • Watershed response to western juniper control

    Creator:
    Deboodt, Timothy L.
    Abstract:
    Western juniper (Juniperus occidentalis) encroachment has been associated with increased soil loss and reduced infiltration resulting in the loss of native herbaceous plant communities and the bird and animal species that rely on them. Hydrologically, however, change in water yield has been linked with the amount of annual precipitation a...
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    Dissertation
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    Ecology and Management presented on May 8, 2008. Title: Watershed Response to Western Juniper