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  • Using Stable Isotopes to Quantify Ecological Interaction Strengths

    Creator:
    Shepard, Isaac D.
    Abstract:
    Understanding ecological interaction strengths is one of the main objectives of ecology. Recently, two methods for estimating interaction strengths of predator-prey interactions in nature have been proposed: a field observation approach proposed by Novak and Wootton (2008) and stable isotope analysis. The field observation method estimates feeding rates based on...
    Resource Type:
    Honors College Thesis
    Full Text:
    91: 2394–2405. Novak, M. and Wootton, J. T. 2008. Estimating nonlinear interaction strengths: An

  • The Predictability of Qualitative Food Web Dynamics in Response to Extinction and Invasion

    Creator:
    Rockow, David J.
    Abstract:
    Food webs are extraordinarily complex, containing myriad direct interactions and indirect effects. Determining how this network of interactions and effects influences a food web’s qualitative dynamics is a challenging task, especially because data on food web structure and individual interaction strengths is unknown in virtually all real-world ecosystems. The goal...
    Resource Type:
    Honors College Thesis
    Full Text:
    . doi: 10.1890/10-1354.1 15. Novak, M., Yeakel, J. D., Noble, A. E., Doak, D. F., Emmerson, M., Estes

  • Grazer-resource Behavior, Interactions, and Feedbacks Control Kelp-forest Dynamics and Stability

    Creator:
    Randell, Zachary H.
    Abstract:
    How the direct and indirect effects of species interactions cascade to affect community structure, functioning, and stability is a fundamental question in ecology. In temperate kelp forests, species interactions, in conjunction with environmental processes, produce rich spatiotemporal dynamics. Arguably the most dramatic of these are abrupt shifts in community state,...
    Resource Type:
    Dissertation
    Full Text:
    Abstract approved: Mark Novak How the direct and indirect effects of species interactions cascade to

  • Stage-structured interactions and their consequences across levels of biological organization

    Creator:
    Segui, Leah Mupas
    Abstract:
    A central challenge for ecology is to understand the dynamic nature of species interactions. A classic approach to community ecology assumes that individuals within a species are functionally identical and that consumer-resource dynamics can be predicted solely by using species abundances. However, one species can consist of multiple functional groups,...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ Mark Novak A central challenge for ecology is to understand the dynamic nature of

  • Candidate Causes, Consequences, and Estimation of Individual Diet Specialization

    Creator:
    Coblentz, Kyle E.
    Abstract:
    Diet variation among individuals within populations is widespread. Often diet differences among individuals are attributable to obvious differences among individuals such as age, sex, or morphology. However, growing evidence suggests that individual diet variation is also common among seemingly identical individuals within populations. This phenomenon has been termed individual diet...
    Resource Type:
    Dissertation
    Full Text:
    , Consequences, and Estimation of Individual Diet Specialization Abstract approved: Mark Novak Diet variation

  • The Influence of Prey Predictability on the Foraging Behavior and Movement of Intertidal Predators

    Creator:
    Hennessey, Shannon M.
    Abstract:
    Fluctuations and spatial heterogeneity of habitat and resources is thought to underlie niche variation in animal populations, with intraspecific differences serving to produce or maintain population-, community-, or ecosystem-level patterns. Individual diet variation, defined as individual variation in food resource use within a population that is consistent over time, is...
    Resource Type:
    Dissertation
    Full Text:
    : _____________________________________________________ Mark Novak Fluctuations and spatial heterogeneity of habitat and resources is thought to

  • Sensitive Barnacles : A Case Study for Collaborative Sustainable Fishery Development

    Creator:
    Bingham, Julia
    Abstract:
    Current human – ocean relationships are dominated by unsustainable extraction of marine resources having both ecological and socio-economic consequences. Sustainable fishery management utilizing stakeholder collaboration must become a proactive strategy to prevent or reduce further long-lasting impacts. In Oregon, USA, a newly developing fishery for gooseneck barnacle (Pollicipes polymerus) presents...
    Resource Type:
    Honors College Thesis
    Full Text:
    Development. Abstract approved: ______________________________________________________ Mark Novak

  • Examining the Latino experience in California agricultural education : a parallel mixed methods multiple case study

    Creator:
    Elliott, Kristopher Michael
    Abstract:
    Latino students are among the fastest growing demographic groups in the nation, particularly in California, Texas, Florida, and New York. Within California in 2014, over 70,000 students are involved in Agricultural Education programs, and Latino students now account for over 50% of the total enrollment - and the percentage of...
    Resource Type:
    Dissertation
    Full Text:
    DISSERTATION OF Kristopher Michael Elliott for the degree of Doctor of Philosophy in Science Education

  • Refractory Amorphous Metal Thin Films

    Creator:
    Olsen, Kristopher R.
    Abstract:
    Amorphous metal thin films lack the grain boundaries and dislocations present in crystalline metal films. As a result, amorphous metal films can be more mechanically robust, atomically smooth, and more resistant to chemical attack than crystalline metals. However, amorphous metals are meta-stable and subject to crystallization upon heating, thus limiting...
    Resource Type:
    Dissertation
    Full Text:
    Kristopher R. Olsen for the degree of Doctor of Philosophy in Chemistry presented on March 23, 2017

  • A multi-trophic level examination of recreational impacts on a national wild and scenic river

    Creator:
    Wright, Kristopher Keith
    Abstract:
    Initially, components of an aquatic food web were examined to study impacts of recreational use on the aquatic ecology of Quartzville Creek, Oregon in 1995 and 1996. Measurements of the food web components consisted of observations of harlequin ducks (Histrionicus histrionicus), visual counts of the larval caddisfly Dicosmoecus gilvipes, benthic...
    Resource Type:
    Masters Thesis
    Full Text:
    national wild and scenic river AN ABSTRACT OF THE THESIS OF Kristopher Keith Wright for the degree of