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Filtering by: Creator Geyer, Nancy A. Remove constraint Creator: Geyer, Nancy A. Academic Affiliation Fisheries and Wildlife Remove constraint Academic Affiliation: Fisheries and Wildlife

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  • Characterizing Microplastic Ingestion in Black Rockfish (Sebastes melanops) along the Oregon Coast

    Creator:
    Lasdin, Katherine S.
    Abstract:
    Microplastics (<5mm diameter) are present in a considerable number of marine and aquatic species. Understanding which species, the global spatial distribution, and what quantities of microplastics are present is extremely important for understanding the potential impacts they could have on recreationally important organisms and for the assessment of risk. We...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Susanne M Brander Microplastics (<5mm diameter) are present in a considerable number

  • Maternal effects, the environment, and age structure: A mechanistic fine-scale approach to describe a complex set of factors contributing to larval growth and survival

    Creator:
    Arnold, Linsey M.
    Abstract:
    The relationship between population characteristics and population productivity is fundamental to sustainable fisheries management, but predicting productivity remains a challenging task. Proposed mechanisms driving the variability in productivity at a given population size have included environmental and demographic factors related to the age structure of the population, but the broad-scale...
    Resource Type:
    Dissertation
    Full Text:
    Effects, the Environment, and Age Structure: A Mechanistic Fine-Scale Approach to Describe a Complex Set

  • Long Term Trends and Sources of Sound in United States Waters

    Creator:
    Haver, Samara M.
    Abstract:
    Passive acoustic monitoring is a valuable tool for observing the status of marine environments. Comparisons of underwater soundscapes over temporal and spatial scales can provide data to inform marine conservation efforts, including protection of threatened and endangered species. This dissertation utilizes passive acoustic data collected via a broadly spaced array...
    Resource Type:
    Dissertation
    Full Text:
    States Waters. Abstract approved: ______________________________________________________ Scott A

  • Using Spatial Capture-Recapture to Estimate Density of Roosevelt Elk in Western Oregon

    Creator:
    Nelson, Jennifer E.
    Abstract:
    Spatial capture-recapture (SCR) is employed for estimating abundance and density of species, particularly those that are cryptic or solitary, and evaluating how population density varies with habitat. However, it is uncertain whether estimates are biased when applied to species that aggregate, such as elk (Cervus canadensis). Wildlife managers in the...
    Resource Type:
    Masters Thesis
    Full Text:
    a reliable method to estimate abundance and density of Roosevelt elk (C. c. roosevelti), as that

  • Movement Ecology and Population Dynamics of the Endangered Hawaiian Duck (Anas wyvilliana)

    Creator:
    Malachowski, Christopher P.
    Abstract:
    Fundamental objectives in the field of conservation biology involve understanding the processes that influence small and declining populations and applying that knowledge to develop appropriate monitoring strategies and targeted management and conservation actions. Critical first steps in determining the relative role of factors that drive population declines involves estimation of...
    Resource Type:
    Dissertation
    Full Text:
    linkages between various life history phases. This full annual cycle approach provides a more

  • The Influence of Wildfire and Invasive Vegetation on Mule Deer

    Creator:
    Schuyler, Elizabeth
    Abstract:
    The western United States has experienced large-scale degradation due to land use and land cover changes, invasion of annual grasses, and expansion of woody plants into grass and shrublands and the resultant altered fire regimes. These landscape-scale changes have coincided with declining mule deer (Odocoileus hemionus) populations, making habitat loss...
    Resource Type:
    Dissertation
    Full Text:
    annual grasses, and western juniper expansion influenced habitat use and survival for a partially

  • Human Alteration of a Neotropical Landscape Drives Long-term Changes in its Forest Bird Communities

    Creator:
    Curtis, Jenna R.
    Abstract:
    Human alteration of natural landscapes leads to biodiversity loss, often from a combination of area effects and fragmentation effects. Smaller habitat patches support fewer species than large ones and incur additional consequences from isolation. Efforts to preempt biodiversity loss from insular habitat fragments are complicated by individualistic species responses and...
    Resource Type:
    Dissertation
    Full Text:
    . Title: Human Alteration of a Neotropical Landscape Drives Long-term Changes in its Forest Bird

  • Jumping in with Both Feet: Exploring Factors that Shape Juvenile Amphibian Movement

    Creator:
    Bredeweg, Evan M.
    Abstract:
    Investigation into how animals move within the landscape is important for both understanding of ecological processes and conservation management. Animal movement is important in shaping life history transitions, demographics, individual fitness, and species distributions. However, as landscapes become increasingly affected by human activities, movement becomes important as species navigate landscapes...
    Resource Type:
    Dissertation
    Full Text:
    are changing animal movement, there is a need to understand the movement patterns and behaviors of

  • The Influence of Alternate Life History Strategies and Natal Conditions on the Reproductive Performance of Adélie Penguins Breeding on Ross Island, Antarctica

    Creator:
    Kappes, Peter J.
    Abstract:
    A fundamental objective of ecology and population biology is to identify factors that drive population dynamics and determine the population-level consequences of their interaction with the environment. Studies of reproductive performance can illuminate population dynamic processes, including the links between organismal biology, the environment, and life history theory. A central...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ Katie M. Dugger A fundamental objective of ecology and population biology is to identify

  • Effects of Elevated CO₂ on Speckled Sanddab (Citharichthys stigmaeus) Behavior

    Creator:
    Andrade, Jessica F.
    Abstract:
    The direct and indirect effects of ocean acidification (OA) are a growing concern, particularly in areas already experiencing elevated levels of oceanic CO₂. Studies with marine fishes suggest that elevated CO₂ levels may affect behavior by interfering with an important brain neurotransmitter. Studies examining the effects of OA fish behavior...
    Resource Type:
    Masters Thesis
    Full Text:
    patient with me when I struggled. Thank you Tom, Nancy, and Sam for being a second family to me. I