Index Catalog // ScholarsArchive@OSU

Creator:: Swaby, James Archie
Abstract:: The sinuous flight behavior of male Douglas-fir tussock moths, Orgyia pseudotsugata, (McD.), is characterized by positive anemotaxis and positive chemoklinotaxis and varies depending on distance from the pheromone source, population density, and time of day. Visual cues play a minor role in close-range orientation to a pheromone source, but males...
Resource Type:: Dissertation

Creator:: Doescher, Paul Steven
Abstract:: This research assessed certain specific plant-soil and community interrelationships in eastern Oregon habitat types dominated by subspecies of Artemisia tridentata. The first evaluation described plant-induced soil chemical patterns for Artemisia tridentata plant communities of high perennial grass-low shrub and low perennial grass-high shrub composition. Soil concentrations of total nitrogen, organic...
Resource Type:: Dissertation

Creator:: Young, William C. (William Clyde)
Abstract:: Seed yield in perennial ryegrass is the product of yield components that develop during the life of the plant. Crop yield potential is defined by the number of fertile tillers, spikelets per spike, and florets per spikelet. It has been shown that perennial ryegrass realizes only a small percentage of...
Resource Type:: Dissertation

Creator:: Clark, Deborah L.
Abstract:: Knowledge of post-dispersal seed fates and other regeneration characteristics is crucial for predicting abundances and distributions of populations and, ultimately, community species composition and diversity. Seed fate studies, however, are rare primarily due to the difficulty of determining seed fates and causes of mortality. This thesis investigated post-dispersal seed fates...
Resource Type:: Dissertation

Creator:: Tʻung, Chao-hsiung
Abstract:: A full range of experiments was carried out to investigate the effects of environmental factors on the terminal bud dormancy in two high-elevation true fir species, Shasta red fir (Abies magnifica A. Murr. var. shastensis Lemm.) and noble fir (A. procera Rehd.), seedlings. Photoperiod, thermoperiod and moisture stress were of...
Resource Type:: Dissertation

ScholarsArchive@OSU