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  • 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

  • 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

  • Seed bank response to juniper expansion in the semi-arid lands of Oregon, USA

    Creator:
    Duncan, Corinne M.
    Abstract:
    Expansion of Juniperus occidentalis into the sagebrush steppe has resulted in significant changes in understory composition. A consequence of increased J. occidentalis dominance may be a depletion of the seed bank. The potential for depletion is problematic because a reduction in the amount of species available from the seed bank...
    Resource Type:
    Masters Thesis
    Full Text:
    . Seed Bank Ecology in Semi-arid Environments Review of the Literature Unfortunately, research

  • Establishing native plants in crested wheatgrass stands using successional management

    Creator:
    Fansler, Valerie A.
    Abstract:
    Crested wheatgrass (Agropyron cristatum (L.) Gaertn.) is a nonindigenous perennial grass that was introduced to North America to improve the condition of degraded rangelands. It has proven to be a successful revegetation species due to its superior ease of establishment, strong competitive ability, and ability to tolerate grazing. However, crested...
    Resource Type:
    Masters Thesis
    Full Text:
    OF Valerie A. Fansler for the degree of Master of Science in Rangeland Ecology and

  • Habitat parameters associated with the distribution of seven willow species on a stream in southeastern Oregon

    Creator:
    Gilbert, Griffith J.
    Abstract:
    Thirteen different habitat parameters were measured either quantitatively or qualitatively around seven different Salix (willow) species on a defined reach of stream on the southwestern slope of Steens Mountain in southeastern Oregon in order to both broaden the current information base of riparian ecology and inform future willow plantings aimed...
    Resource Type:
    Masters Thesis
    Full Text:
    Southeastern Oregon CHAPTER 1 Introduction Context of the Research Riparian Ecology Riparian plant

  • Ecology of Craterellus tubaeformis in western Oregon

    Creator:
    Trappe, Matthew James
    Abstract:
    Craterellus tubaeformis is a small to medium-sized forest mushroom that is fairly common in the Douglas-fir/western hemlock forests of the Pacific Northwestern United States and is most often associated with decayed coarse woody debris. In this study, the mycorrhizae of Craterellus tubaeformis in western Oregon is identified by DNA analysis...
    Resource Type:
    Masters Thesis
    Full Text:
    Ecology of Craterellus tubaeformis in Western Oregon: An Introduction INTRODUCTION Basis for research

  • Vegetation composition and response to fire of native Willamette Valley wetland prairies

    Creator:
    Pendergrass, Kathy L. (Connelly)
    Abstract:
    Fires set by Native Americans were important in shaping and maintaining Willamette Valley prairie plant communities. With fire exclusion after Euro-American settlement in the 1840's, composition of the remaining prairies shifted toward shrub and tree dominance with a concomitant decline in endemic prairie plant populations. I hypothesize that by restoring...
    Resource Type:
    Masters Thesis
    Full Text:
    burning Willamette Valley wetland prairies to maintain and enhance desired species. This research

  • Fire effects on vegetation diversity, structure, and successional dynamics in shrub-steppe and mixed conifer environments of the Hells Canyon, Idaho

    Creator:
    Havlina, Douglas William
    Abstract:
    The effects of fire severity on post-fire succession and shrub demography were quantified in shrub-steppe grasslands and subalpine forests in the Hells Canyon of the Payette National Forest, Idaho. Following the 1988 Eagle Bar Fire, species frequency, community diversity, fire adaptations, and stand ages were quantified at 12 plots in...
    Resource Type:
    Masters Thesis
    Full Text:
    research addressing disturbance ecology in the environments of the Hells Canyon is central to ecosystem

  • Modeling and dynamics analysis of P2P networks based on evolutionary games

    Creator:
    Cho, Seungyun
    Abstract:
    Since free riders in P2P network reduce the system's performance, how to maintain and encourage the nodes' cooperation is an important aspect of P2P related research. In this thesis, a P2P system is modeled based on two games: stag hunt game and snowdrift game. To relate the model to the...
    Resource Type:
    Masters Thesis
    Full Text:
    take place. This evolutionary game theory approach allows for ecology of behaviors to evolve over

  • A neuro-evolutionary multiagent approach to multi-linked inverted pendulum control

    Creator:
    Sills, Stephen
    Abstract:
    Recent work has shown humanoid robots with spinal columns, instead of rigid torsos, benefit from both better balance and an increased ability to absorb external impact. Similarly, snake robots have shown promise as a viable option for exploration in confined spaces with limited human access, such as during power plant...
    Resource Type:
    Masters Thesis
    Full Text:
    of Science in Mechanical Engineering presented on May 29, 2012. Title: A Neuro-evolutionary