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Filtering by: Creator Robinson, Elizabeth J. Z. Remove constraint Creator: Robinson, Elizabeth J. Z. Academic Affiliation Zoology Remove constraint Academic Affiliation: Zoology

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  • The effects of community composition, landscape structure, and climate on host-pathogen interactions

    Creator:
    Moore, Sean M.
    Abstract:
    Like other species interactions in ecological systems, host-pathogen interactions are influenced by environmental factors, landscape characteristics and the broader community context. My thesis explores the potential influences of food-web interactions (Chapter 2), climate change (Chapter 3), landscape structure and host movement patterns (Chapter 4), and the combined influences of local...
    Resource Type:
    Dissertation
    Full Text:
    Composition, Landscape Structure, and Climate on Host-Pathogen Interactions Abstract approved: Elizabeth T

  • A comparative study of prenatal behavior ontogeny in altricial and precocial murid rodents

    Creator:
    Robinson, Scott R., 1952-
    Abstract:
    Using techniques that permit the direct observation of fetuses in vivo, prenatal behavioral development was compared among four species in the rodent family Muridae: the Norway rat (Rattus norvegicus), Mongolian gerbil (Meriones unguiculatus), cotton rat (Sigmodon hispidus), and spiny mouse (Acomys cahirinus). Rattus and Meriones bear altricial offspring, as do...
    Resource Type:
    Dissertation
    Full Text:
    altricial and precocial murid rodents AN ABSTRACT OF THE THESIS OF Scott R. Robinson for the degree of

  • Selection on larval and adult body size in a marine fish: potential evolutionary responses and effects on population dynamics

    Creator:
    Johnson, Darren W.
    Abstract:
    Many species have complex life cycles in which a dispersive larval stage is followed by a relatively sedentary adult stage. For such species, reproductive output is often high and large variation in survivorship throughout early life-history phases (eggs and larvae) can lead to dramatic fluctuations in recruitment which may in...
    Resource Type:
    Dissertation
    Full Text:
    analyses. Douglas Robinson was a patient and flexible graduate representative as well as source of

  • Phytoplankton shading of marine benthic macrophytes: Implications for intertidal community structure

    Creator:
    Kavanaugh, Maria T.
    Abstract:
    Previous observations of light levels and phytoplankton abundances along the Oregon coast demonstrated that phytoplankton attenuated light sufficiently to potentially limit the growth of intertidal macrophytes and therefore structure local intertidal communities. Inspired by this observation, in spring 2004, I initiated a study to quantify the direct and indirect benthic...
    Resource Type:
    Masters Thesis
    Full Text:
    (Statistics), and my graduate representative, Dr. Tara Robinson. Dr Nielsen not provided much advice on

  • Ecological responses to riverine floods and flow alteration

    Creator:
    McMullen, Laura E.
    Abstract:
    Floods are major disturbance events for riverine ecosystems, directly and indirectly impacting organisms and their habitat. In this study I investigated the role of riverine floods and flow alteration in regulating aquatic macroinvertebrate population and community structure. I examined this problem using a variety of methods: a meta-analytic review of...
    Resource Type:
    Dissertation
    Full Text:
    , Elizabeth Borer, Russ Ingham, and Desiree Tullos, for their commitment to the success of my graduate

  • The role of herbivores and productivity on community structure of rocky shores of the Galapagos Islands, Ecuador

    Creator:
    Vinueza, Luis R.
    Abstract:
    Ecosystems are facing increasing threats from human related activities, such as overfishing, pollution, habitat destruction, species invasions, and diseases, among others. While oceanic islands provide natural laboratories to understand ecological and evolutionary process, they are also particularly vulnerable to these impacts, given their usual isolation from the mainland and the...
    Resource Type:
    Dissertation
    Full Text:
    TAing for you, Bruce. I would also like to acknowledge the members of my committee: Elizabeth Borer

  • On the evolution of correlated color traits in garter snakes

    Creator:
    Westphal, Michael F.
    Abstract:
    How complex traits evolve continues to be a major focus of evolutionary investigation. A current topic of debate is the hypothesis that the phenotypic integration of complex traits gives rise to evolutionary constraints. I studied two color traits in the common garter snake, Thamnophis sirtalis, that show a high level...
    Resource Type:
    Dissertation
    Full Text:
    : ___________________________________________________________ Stevan J. Arnold How complex traits evolve continues to be a major focus of evolutionary

  • The effects of an emerging pathogen on amphibian host behaviors and interactions

    Creator:
    Han, Barbara A.
    Abstract:
    Contemporary environmental change encompasses massive biodiversity loss and increasing numbers of emerging diseases worldwide. As part of a global biodiversity crisis, amphibians are disappearing at unprecedented rates. Batrachochytrium dendrobatidis is an emerging infectious pathogen prominently associated with many declines. Chapter 1 reviews the past decade of research on this system...
    Resource Type:
    Dissertation
    Full Text:
    disease ecology. He is also a gifted teacher. Elizabeth Borer is a rare role model whom I respect

  • The fine structure of the arthrobranch of the crayfish, Pacifastacus leniusculus Dana, with special reference to active ion uptake

    Creator:
    Morse, Howard Curtis
    Abstract:
    The gills of an Oregon crayfish, Pacifastacus leniusculus Dana, were examined with histological and histochemical techniques and their fine structure was investigated by electron microscopy. Special attention was given to the structural basis of active ion uptake. The histology of these gills was the same as that of other crayfish...
    Resource Type:
    Dissertation

  • The fine structure of the fibrillar club cell in the epidermis of Lampetra planeri (Bloch)

    Creator:
    Morse, Howard Curtis
    Abstract:
    The epidermis of the brook lamprey, Lampetra planers (Bloch), has been examined with histological and histochemical techniques and the fine structure of the fibrillar club cells has been studied with electron microscopy. In histological structure the epidermis was found to correspond to the observations of earlier workers. The stratified epidermis...
    Resource Type:
    Masters Thesis
    Full Text:
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