Life Sciences Commons^™

The Impact Of A Mountain Pine Beetle Epidemic On Wildlife Habitat And Communities In Post-Epidemic Stands Of A Lodgepole Pine Forest In Northern Utah, William E. Stone

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Natural disturbance events influence the patterns and processes in many forest ecosystems. Ecosystem management of coniferous forests in western North America requires the recognition of the importance that natural disturbance regimes have in achieving sustainable resource production and maintaining biological diversity . Mountain pine beetle epidemics have played an historic role in the succession and structure of lodgepole pine forests in this region. Their effects on wildlife habitat and communities are undocumented, but are presumed to be substantial. I sought to quantify these effects in forty 1-ha stands of monotypic, even-aged, mature lodgepole pine forest in northern Utah approximately 3-8 …

Lodgepole Pine Susceptibility Rating Of Mountain Pine Beetle Through The Use Of A Density Management Diagram, John Albert Anhold

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Ninety-four unmanaged lodgepole pine stands were examined to evaluate the relationship between stand density and susceptibility to mountain pine beetle attack. Sample included stands from a broad geographical range in the western United States.

Beetle population trends were not significantly related to variation in stand density as measured by stand density index (SDI). The percentage of trees killed per acre by the mountain pine beetle in stands with greater than eighty percent lodgepole pine did vary significantly with changes in SDI. From these data three SDI zones were identified: 1) stands with SDI's of less than 125 showed low potential …

Investigation Of Host Selection By Mountain Pine Beetle (Dendroctonus Ponderosae) Hopk. In Lodgepole Pine (Pinus Contorta) Dougl., Thomas James Eager

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Lodgepole pines Pinus contorta (Douglas) were treated by girdling to assess the response by an endemic population of mountain pine beetle Dendroctonus ponderosae (Hopkins) (Coleoptera: Scolytidae). Capture in 'sticky traps' indicated that the beetles were attracted while in flight towards the wounded trees. A significant difference in the landing rates of bark beetles between the treated and untreated trees indicated that the beetles were able to distinguish wounded from non-wounded trees while still in flight. Pressure chamber readings demonstrated that water stress developed in the girded trees when compared to the non-girdled trees.