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  • Studies on resistance of rice to Sogatodes oryzicola (Muir) and a parasitoid, Haplogonatopus sp., in Costa Rica

    Creator:
    Alvarez B., Francisco
    Abstract:
    Twenty-one rice cultivars were evaluated to determine the difference between populations of Sogatodes oryzicola (Muir) (Homoptera: Delphacidae) in Costa Rica and Colombia, Survival, mortality and population development of S. oryzicola on five selected cultivars was used to determine levels of plant resistance. The importance and potential of the parasitoid-predator Haplogonatopus...
    Resource Type:
    Masters Thesis
    Full Text:
    thanks to my Graduate Committee Dr. H. Ronald Cameron, Dr. Theodore P. Kistner, and especially to Dr. M

  • Experimental cervine Sarcocystis infections in mule deer

    Creator:
    Hudkins, G. Gale
    Abstract:
    Preliminary studies with a dog (Canis familiaris) and a coyote (Canis latrans) showed that these carnivores can serve as definitive hosts in the life cycle of Sarcocystis fusiformis of cattle (Bos taurus) and a microscopic Sarcocystis of mule deer (Odocoileus hemionus hemionus). Preliminary studies to determine effects of the cervine...
    Resource Type:
    Masters Thesis
    Full Text:
    ACKNOWLEDGEMENTS I would like to offer my sincere gratitude to Dr. Theodore P. Kistner for his advice, assistance

  • Evaluation of meadowfoam (Limnanthes alba) meal as a feedstuff for rabbits, poultry and sheep

    Creator:
    Throckmorton, John C.
    Abstract:
    Meadowfoam (Limnanthes alba) is a winter annual oilseed crop native to the Pacific Coast states. Seven experiments were conducted to evaluate extracted meadowfoam meal (MFM) as a feedstuff for poultry, rabbits and sheep. Three experiments were conducted to evaluate MFM as a protein supplement for broiler chicks and weanling rabbits....
    Resource Type:
    Masters Thesis
    Full Text:
    aqueous acetone extracted (EXT) MFM. Weight gains and feed efficiency were severely depressed (P<0.01

  • Population characteristics and habitat utilization of bighorn sheep, Steens Mountain, Oregon

    Creator:
    Van Dyke, Walter A.
    Abstract:
    A herd of re-introduced California bighorn sheep (Ovis canadensis californiana) was studied from 15 June 1976 to 31 August 1977. Thirteen major and seven minor habitats were delineated and described. Habitat use by bighorns was observed throughout the study and a habitat preference value (H.P.V.) was calculated based on use...
    Resource Type:
    Masters Thesis
    Full Text:
    am grateful to my committee members - D. S. deCalesta, A. H. Winward, and T. P. Kistner, for their

  • Zooplankton of the Galapagos Islands

    Creator:
    Figueroa, Diego
    Abstract:
    The marine climate of the Galapagos is spatially and seasonally heterogeneous. A taxonomically comprehensive study of Galapagos zooplankton has never been done. This study is an initial effort to establish the distribution and community structure of zooplankton in the Archipelago. I collected zooplankton samples by vertical tows over the Galapagos...
    Resource Type:
    Dissertation
    Full Text:
    throughout my graduate studies and to the rest of my Graduate Committee, Katharine G. Field, Theodore P