Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"bark beetle"”.
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Modeling Endemic Bark Beetle Populations in Southwestern Ponderosa Pine Forests
Bark beetle populations phase between epidemic, outbreak levels, and low population density, endemic levels. The majority of scientific research is focused on outbreak populations because of the associated economic, ecological, and social impacts. Endemic populations are rarely studied but could …
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Effects of host stored resources on bark beetle-fungal-conifer interactions
<p>Bark beetles and their associated fungi are among the greatest natural threats to conifers worldwide, but the degree to which host stored resources influence tree-beetle-fungal interactions has not been investigated. In western North America, the range of the mountain pine beetle (Dendroctonus …
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Effects of host stored resources on bark beetle-fungal-conifer interactions
<p>Bark beetles and their associated fungi are among the greatest natural threats to conifers worldwide, but the degree to which host stored resources influence tree-beetle-fungal interactions has not been investigated. In western North America, the range of the mountain pine beetle (Dendroctonus …
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Cost share payment and willingness to participate in Virginia's Pine Bark Beetle Prevention Program
… management practices which reduce southern pine beetle (SPB) risk benefit not only the landowners who perform them, but all those who draw benefits from southern pine forests in Virginia, especially other forest owners within the same region. One such management practice is pre-commercial …
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Spruce bark beetle disturbance in the forest-tundra ecotones of southwest Yukon: impacts and predisposing factors
… ecotones of southwest Yukon to spruce bark beetle (Dendroctonus rufipennis) infestation, and investigated the subsequent effects of insect disturbance on the growth and establishment of white spruce (Picea glauca). Specific objectives were to evaluate (i) the relationships between stand …
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Forest respiration from eddy covariance and chamber measurements under high turbulence and a bark beetle epidemic
… at night potentially causing the difference. A bark beetle outbreak at the GLEES Ameriflux site provided a unique opportunity to compare chamber and EC estimates of ecosystem respiration (R) under conditions of high turbulence (summer night mean u* = 0.7 m s-1) and 85% mortality of the …
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Impact of bark beetle infestation on water quality and hydrology in the Rocky Mountain West, The
The recent large-scale bark beetle infestations have altered the forested landscape covering much of the Rocky Mountain West. With canopy loss and changes in water and nutrient uptake, watershed hydrology and terrestrial biogeochemical cycling have been significantly altered. This dissertation …
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Aggregation, dispersal and edge behavior of the bark beetle predator Thanasimus dubius (Coleoptera: Cleridae); potential use in biological control
Bark beetles are major pests of pine forests in North America that can inflict considerable damage and cause severe economic loss. The checkered beetle Thanasimus dubius Fabricius (Coleoptera: Cleridae), an abundant predator in the Eastern USA and Canada, has been suggested to influence the …
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Long-Term Effects of Thinning and Prescribed Fire on Tree Growth and Bark Beetle Demography in a Jeffrey Pine Stand
… tree and stand level growth responses as well as bark beetle demography in pure, uneven-aged Jeffrey pine (Pinus jeffreyi Grev. & Balf.) accompanied by isolated California white fir (Abies concolor var. lowiana [Gord.] Lemm.). Based on both dimension and volume growth measures, trees of the …
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Proteomic studies of the pheromone biosynthetic pathway in the bark beetle, Ips pini, and molecular modeling of an insect-specific aldehyde oxidative decarbonylase, CYP4G2
Bark beetles have had devastating economic and environmental impacts in both the United States and Canada in the last decade. Male pioneer pine engraver beetles, Ips pini, find a host tree and release an aggregation pheromone, ipdienol. Ipsdienol is produced de novo in midgut tissue and is released …
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Sýkingarmætti grágeitarsveppsins Ophiostoma clavatum í fræplöntum skógarfuru
… in recent decades, an increased severity of the bark beetle Ips acuminatus attacks on Scots pine has been observed, both in Finland and in the alpine regions of Europe. I. acuminatus vectors O. clavatum and these attacks have led to increased tree mortality. This research was designed to …
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Effect of tree mortality on biogeochemical response after mountain pine beetle forest infestation, The
… the American West are experiencing large-scale, bark beetleinduced mortality in association with a changing climate. As resulting terrestrial biogeochemical responses to this ecosystem disturbance are unclear, we hypothesized that a threshold of localized tree mortality must be exceeded before …
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The fungi and bacteria associated with three tree-killing beetles: from new species to complex communities.
… can play critical roles in the life cycles of bark and woodboring beetles, influencing tree colonization and, in some cases, negatively impacting tree health. This dissertation investigates the microbial communities of two bark beetles and one woodboring beetle. The eastern larch beetle …
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The Southern pine beetle, Dendroctonus frontalis Zimm., and associated Coleoptera attracted to dead loblolly pine, Pinus taeda L.
This study tests the hypothesis: Bark beetles initially locate their host trees in a non-random manner. The association of the southern pine beetle (<u>Dendroctonus frontalis</u> Zimm.) and associated Coleoptera with stressed trees suggested the direction for this study. Loblolly pine trees, …
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Assessment of the Potential Role of Blizzard Damage in the Spatial Distribution of Southern Pine Beetle Infestation in Unicoi County, Tennessee.
<p>The Southern Pine Beetle, or SPB, (<em>Dendroctonus frontalis</em> Zimmerman) is a bark beetle that is endemic to the Southern forest ecosystem. Beetle populations remain stable for years at a time; however, for reasons not fully understood the beetle undergoes accelerated population growth on …
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Habitat Use by Boreal Mammals in Response to Salvage Logging After an Insect Outbreak
… in response to salvage logging after a bark beetle outbreak in Yukon, Canada. I monitored species occupancy in beetle-affected forests and salvage-logged stands of different tree retention levels and ages using wildlife cameras and bat detectors. Moose occupancy was highest in …
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Ecology and Conservation of Birds of Pinyon -Juniper Woodlands
… U.S. experienced a severe drought, leading to a bark-beetle outbreak that killed pinyon pines over several million ha of pinyon juniper woodlands. On 15 study sites in Arizona and Utah, I found no evidence that any bird species had declined in response to pine mortality between 2001 and 2005. In …
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