Index Catalog // ScholarsArchive@OSU

Impact of insects on seed production in a Douglas-fir seed orchard in Oregon

Creator:: Dombrosky, Scott A.
Abstract:: The impact of various factors on seed production in a Douglas-fir (Pseudotsuga menziesii) seed orchard in western Oregon was examined by monitoring the fate of seeds in thirty cones, stratified into three crown levels, on each of ten trees during the 1984 growing season. Cones were examined monthly between April...
Resource Type:: Masters Thesis

Biosystematic studies of the Mimulus moschatus complex in the Pacific Northwest

Creator:: Meinke, Robert James
Abstract:: Populations of an unknown species of Mimulus, herein described as Mimulus hymenophyllus Meinke, were located and studied near Horse Creek, a tributary of the Snake River in eastern Wallowa County, Oregon. The new species is differentiated from its apparent closest relative, Mimulus jungermannioides Suksd., by an annual habit, long petioles,...
Resource Type:: Masters Thesis

Ecological aspects of kin discriminating behavior with implications of functional value

Creator:: Hokit, D. Grant
Abstract:: To assess the context dependence of kin discriminating behavior, I examined kin-biased aggregation behavior in tadpoles of R. cascadae in different ecological conditions. I manipulated food distribution, predator presence, thermal heterogeneity, and relatedness in a multifactorial mesocosm experiment. All four factors interacted to influence tadpole dispersion. My results suggest that...
Resource Type:: Dissertation

Characteristics of Typhlodromus americanus Chant and Yoshida-Shaul (Acari: phytoseiidae) as a biological control agent of Oligonychus ununguis (Jacobi) (Acari: tetranychidae)

Creator:: Horton, Rene N.
Abstract:: The life history, temperature, humidity, and feeding requirements of the phytoseiid predator mite, Typhlodromus americanus Chant and Yoshida-Shaul were tested in the laboratory. Occurance of the mite in the field during different times of the year was investigated as well. Effects of temperature and humidity on egg hatch, the feeding...
Resource Type:: Masters Thesis

The effects of pathogens, UV-B radiation, and introduced species on amphibians in the Pacific Northwest

Creator:: Kiesecker, Joseph Michael
Abstract:: I examined two amphibian communities to assess factors that may impact amphibian biodiversity. The results suggest that the potential factors which influence the maintenance of amphibian biodiversity are multi-faceted and thus, attempts to understand these factors must reflect these complexities. I investigated factors that influenced the susceptibility of western toad...
Resource Type:: Dissertation

Evaluation of behavioral response of Aedes aegypti mosquitoes to repellents using a novel olfactometer

Creator:: Doğan, Elif Barc̦in
Abstract:: Mosquito-borne pathogens are the cause of important, often deadly diseases worldwide; and, use of repellents is one of the components of mosquito control programs. The most effective mosquito repellent is N,N-dimethyl-m-toluamide, known as DEET. Speculation on the adverse effects of DEET have been on the rise since the 1980s, and...
Resource Type:: Dissertation

The effects of predation on anuran metamorphosis

Creator:: DeVito, Jill
Abstract:: Many organisms with complex life cycles undergo transition periods associated with increased vulnerability to predation. Several evolutionary adaptations have been proposed as antipredator defenses for organisms during risky transition periods. These include: shortening of the transition period, parental care, cryptic coloration, and synchrony of risky transitions with large numbers of...
Resource Type:: Masters Thesis

Pheromonal mediation of reproductive behavior in the brown tree snake

Creator:: Greene, Michael John
Abstract:: In animals, reproductive behaviors serve to attract individuals together during the breeding season and to coordinate the behavioral and physiological states of individuals so that mating can successfully occur. In snakes, the various reproductive behaviors including courtship, mating, courtship inhibition, male combat and trailing are mediated primarily by pheromones. Pheromones...
Resource Type:: Dissertation

New insight into the morphology and physiology of Mesozoic archosaurs

Creator:: Jones, Terry D.
Abstract:: Inferences regarding the biology of extinct taxa are often founded primarily on cladistically-based phylogenetic hypotheses. However, these inferences are frequently inconsistent with the morphology and physiology of modern animals. I suggest that reference to the biology of modern animals might be a more appropriate tool to aid in the reconstruction...
Resource Type:: Dissertation

Population ecology of the dusky Canada goose (Branata candensis occidentalis Baird)

Creator:: Sheaffer, Susan E.
Abstract:: Adult dusky Canada geese (Branta canadensis occidentalis Baird) were banded with plastic neck bands and observed on the winter range during 1985-92. Annual survival rates of adult geese estimated from observation data ranged from 76% to 85%. A model of Canada goose population dynamics was developed to illustrate relationships between...
Resource Type:: Dissertation

ScholarsArchive@OSU

Impact of insects on seed production in a Douglas-fir seed orchard in Oregon

Biosystematic studies of the Mimulus moschatus complex in the Pacific Northwest

Ecological aspects of kin discriminating behavior with implications of functional value

Characteristics of Typhlodromus americanus Chant and Yoshida-Shaul (Acari: phytoseiidae) as a biological control agent of Oligonychus ununguis (Jacobi) (Acari: tetranychidae)

The effects of pathogens, UV-B radiation, and introduced species on amphibians in the Pacific Northwest

Evaluation of behavioral response of Aedes aegypti mosquitoes to repellents using a novel olfactometer

The effects of predation on anuran metamorphosis

Pheromonal mediation of reproductive behavior in the brown tree snake

New insight into the morphology and physiology of Mesozoic archosaurs

Population ecology of the dusky Canada goose (Branata candensis occidentalis Baird)

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