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Filtering by: Has journal Evolutionary Ecology Research Remove constraint Has journal: Evolutionary Ecology Research Non-Academic Affiliation Oregon State University. Graduate School Remove constraint Non-Academic Affiliation: Oregon State University. Graduate School

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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...
    Resource Type:
    Dissertation
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    Abstract approved: Jane Lubchenco The term "interaction" in evolutionary biology and ecology describes

  • A model of trophic evolutionary pathways

    Creator:
    Morris, A. Kimo
    Abstract:
    Calow (1983) realized that differences between parasites and their free-living relatives can be explained by the differences in nutrient richness. I propose a model that is based on Calow's idea which identifies the relative position of different trophic strategies (e.g. predation, grazing, parasitism and others) based on (1) the differences...
    Resource Type:
    Masters Thesis
    Full Text:
    A model of trophic evolutionary pathways AN ABSTRACT OF THE

  • 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...
    Resource Type:
    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...
    Resource Type:
    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...
    Resource Type:
    Dissertation
    Full Text:
    - 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...
    Resource Type:
    Dissertation
    Full Text:
    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...
    Resource Type:
    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...
    Resource Type:
    Dissertation
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    for plant systematic research and the Leslie and Vera Gottlieb research fund in evolutionary biology

  • Optimizing ballast design of wave energy converters using evolutionary algorithms

    Creator:
    Colby, Mitchell
    Abstract:
    Wave Energy Converters (WECs) promise to be a viable alternative to current electrical generation methods. However, these WECs must become more efficient before wide-scale industrial use can become cost-effective. The efficiency of a WEC is primarily dependent upon its geometry and ballast configuration which are both difficult to evaluate, due...
    Resource Type:
    Masters Thesis
    Full Text:
    Design of Wave Energy Converters Using Evolutionary Algorithms Abstract approved: Kagan Tumer Wave

  • 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...
    Resource Type:
    Dissertation
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    not treated as such in most multiagent research. To date, there has been little research attention