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  • The Ibis, journal of the British Ornithologists' Union : a pre-synthesis portrait

    Creator:
    Johnson, Kristin Renee
    Abstract:
    In 1959 the British Ornithological journal, The Ibis, published a centenary commemorative volume on the history of ornithology in Britain. Over the previous few decades, the contributors to this volume had helped focus the attention of ornithologists on the methods, priorities, and problems of modem biology, specifically the theory ofevolution...
    Resource Type:
    Masters Thesis
    Full Text:
    of Animal Ecology - with an Author Index," Journal ofAnimal Ecology 50(1981): 951-71, in which the

  • Spatiotemporal distribution of the anti-diabetic drug, metformin, in the lower Columbia River and its effect on phytoplankton growth

    Creator:
    Cummings, Brittany M.
    Abstract:
    Water quality impacts both human and ecosystem health. Many pharmaceuticals and personal care products are considered contaminants of emerging concern (CEC) due to their bioactive properties. Among these, metformin—the most commonly prescribed drug for treatment of type 2 diabetes—has been reported at high concentrations (μg L⁻¹) in stream, lake, and...
    Resource Type:
    Masters Thesis
    Full Text:
    OREGON HEALTH & SCIENCE UNIVERSITY SCHOOL OF

  • Effects of perturbation on community structure and organization in aquatic microcosms

    Creator:
    Finger, Susan Everett
    Abstract:
    Aquatic communities consisting of guppies, amphipods, copepods, snails, nematodes, rotifers, protozoans, euglenoid flagellates, and other microorganisms were established in sixteen laboratory microcosms. Guppies were exploited at four different levels (0 percent, 10 percent, 20 percent, and 40 percent of the population biomass) with four communities at each level of exploitation....
    Resource Type:
    Masters Thesis
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    COMMUNITY STRUCTURE AND ORGANIZATION OF A Abstract approved: IC ICROCOSMS Charles E. Warren Aquatic

  • The ecology of insects associated with waste water lagoons

    Creator:
    Sturgess, Brian Thomas
    Abstract:
    The purpose of this study was to determine what insect species occurred in waste water facilities at Corvallis, Oregon, and to correlate these species with the chemical, physical, and biological features common to these facilities. Data collected on a routine basis included dissolved oxygen, temperature, algal density, and insect population...
    Resource Type:
    Masters Thesis
    Full Text:
    for identifications of aquatic in- sects: Dr. J. D. Lattin (Herniptera), Dr. J.E. Sublette

  • Modeling of ammonia losses in sprinkler application of animal wastes

    Creator:
    Pote, Jonathan W. (Jonathan Woodrome)
    Abstract:
    A model to predict ammonia losses from sprinkler applied animal wastes was developed; in order to accomplish this, a review of literature was performed to determine possible methods of predicting ammonia losses during sprinkling. As adaptability to a large variety of situations was considered of maximum importance, the number of...
    Resource Type:
    Masters Thesis
    Full Text:
    Animal Wastes AN ABSTRACT OF THE THESIS OF JONATHAN WOODROME POTE for the degree of MASTER OF SCIENCE

  • Comparison of dosimetric modeling of the International Commission on Radiological Protection trout reference animal

    Creator:
    Comolli, Michelle LeAnne
    Abstract:
    Radiation protection has historically been from a human protection approach, therefore many studies have neglected the potential dose contribution from the gastrointestinal tract (GIT) in animal studies. The International Commission on Radiological Protection (ICRP) utilized simplified geometric shapes with Dose Conversion Factors (DCF) based on homogenized models for the trout...
    Resource Type:
    Masters Thesis
    Full Text:
    Comolli for the degree of Master of Science in Radiation Health Physics presented on October 4, 2013

  • Ecological study of aquatic myxobacteria in a woodland stream

    Creator:
    Carlson, René Virginia
    Abstract:
    Most studies of bacteria in water have concerned public health; little attention has been given to organisms which are indigenous to the aquatic environment. Myxobacteria are known to occur in soil, in the marine environment, and several have been studied in relation to diseases of salmonid fishes. However, little information...
    Resource Type:
    Masters Thesis
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    Ecological study of aquatic myxobacteria in a woodland

  • The reproduction and mode of spread of sago pondweed (Potamogeton pectinatus L.) in irrigation system

    Creator:
    Ogg, Alex G.
    Abstract:
    Nine experiments were conducted during 1964 and 1965 to study the methods of reproduction and mode of spread of sago pondweed (Potamogeton pectinatus) in irrigation systems. Frequent treatments of sago pondweed foliage with aromatic solvent greatly reduced the number of tubers in the substratum of an irrigation canal. However, complete...
    Resource Type:
    Masters Thesis
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    seed -like fruits of some aquatic plants unharmed in their stomachs. The consumption of propagules

  • The coloration of animals : a nineteenth century controversy

    Creator:
    Blaisdell, Muriel Louise
    Abstract:
    Mimicry, obscure colors, and secondary sexual colors were important classes of observations that were analyzed by nineteenth century biologists from several vantage points. Adherents of the doctrine of special creation of fixed species believed animal colors to be evidence of design; Darwin and Wallace and their successors suggested that a...
    Resource Type:
    Masters Thesis
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    doctrine of special creation of fixed species believed animal colors to be evidence of design; Darwin and

  • The morphology and biology of Macrovelia hornii Uhler (Heteroptera : Mesoveliidae)

    Creator:
    Anderson, Aage Bernard
    Abstract:
    The external and internal morphology are considered and important morphological characters are found which relate Macrovelis to the family Mesoveliidae. Both macropterous and Brachypterous forms occur throughout the western half of the United States. The adults and nymphs are restricted to the margins of springs and streams during the reproductive...
    Resource Type:
    Masters Thesis
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    literature for the aquatic or semi -aquatic Heteroptera. DuFour illustrated the salivary glands of Gerris