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Alpine Vegetation Of Steens Mountain, Paul Collins
Alpine Vegetation Of Steens Mountain, Paul Collins
Dissertations and Theses
A determination was made that the summit of Steens Mountain is an alpine tundra. The assessment was based on floristics, vegetation and community structure, environmental parameters, and geomorphological criteria. Microhabitats of Oxyria digyna at low elevations were found to approximate alpine conditions.
Small Mammal Dissemination Of Dwarf Mistletoe Seeds, Daniel Eugene Lemons
Small Mammal Dissemination Of Dwarf Mistletoe Seeds, Daniel Eugene Lemons
Dissertations and Theses
No study has been done in the western United States concerning dispersal of dwarf mistletoe by mammals. At the outset of the study it was determined that the red squirrel, the yellow pine chipmunk (Eutamias amoenus), the northern flying squirrel, and the bushy-tailed wood rat (Neotaoma cinerea), were all potential vectors of seeds. The red squirrel was chosen as the main object of study because it is diurnal and is closely associated with ponderosa pine (Pinus ponderosa), a heavily infected species. The study was undertaken to determine whether small mammals play a significant role in transporting mistletoe seeds to uninfected …
Germination, Respiration And Photosynthesis In Seeds Of Dwarf Mistletoe (Arceuthobium), Steven Wayne Gustafson
Germination, Respiration And Photosynthesis In Seeds Of Dwarf Mistletoe (Arceuthobium), Steven Wayne Gustafson
Dissertations and Theses
Germination, respiration, and photosynthesis in seeds of dwarf mistletoe (Arcenthobium) were studied. The effects of 1 hour soakings of seeds in aqueous solutions of 1, 2, or 3% H2O2 or 1, 2, 3, 4, or 5% Chlorox on germination of seeds were tested. Germination rates for seeds from three consecutive years (1975-1977) were obtained. Germination rates varied widely. This variance transcended subtle changes in treatment. Pretreatment of seeds with Chlorox resulted in significantly lower germination rates than those of the control. Chlorophyll concentrations were determined for seeds and aerial shoot tissue of four species. Seeds of A. …