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 72 for “"Juniper"”.
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Mule Deer Responses to a Pinyon-Juniper Removal
… single-leaf pinyon (Pinus monophylla) and Utah juniper (Juniperus osteosperma) into sagebrush communities in the Great Basin. Pinyon-juniper woodlands are adept at outcompeting herbaceous vegetation that is crucial for mule deer. We administered a pinyon-juniper removal treatment on mule deer …
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Ecology and Conservation of Birds of Pinyon -Juniper Woodlands
… 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 2004, during the drought, and 2005, a wet year, I studied avian nesting success …
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Analysis of polymeric extractives of Western Juniper (Juniperus occidentalis) heartwood
Extractives of Western Juniper (Juniperus occidentalis) have been isolated and separated by chromatographic means. Since this species is durable, bioactivity of several fractions has been determined. The bioactivity has been determined by the brine shrimp lethal bioassay. Less polar compounds with …
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Response of Pinyon-juniper woodlands to fire, chaining, and hand thinning
Pinyon-juniper (Pinus monophylla - Juniperus osteosperma) woodlands have expanded and infilled over the last 150 years to cover more than 40 million ha in the Great Basin. Many land managers seek to remove Pinyon-juniper trees using a variety of treatments. This thesis looks at six different …
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Post-fire vegetation and bird habitat use in piñon-juniper woodlands
… resilience of some forest types, such as piñon-juniper, are often overlooked. Piñon-juniper is a dominant forest type in the western US and provides breeding habitat for many obligate or semi-obligate bird species. Similarly, this system is supported by a critical mutualism, where the …
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Establishment, Mortality and Growth of Recruits in an Experimentally Disturbed Piñon-Juniper Woodland
Piñon-juniper woodlands across the American Southwest are experiencing widespread overstory mortality due to episodes of prolonged extreme drought. There is a question whether forests can fully recover from these events to their previous state, or whether they are succeeded by more arid woodlands, …
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Relationships of piñon juniper woodland expansion and climate trends in the Walker Basin, Nevada
… United States, woodyencroachment of piñon juniper (Pinus monophylla & Juniperus osteosperma) woodlandsis well known, but the drivers of its expansion are not well understood across elevationalgradients. Predominant theories of future vegetation distribution change due to achanging climate, …
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Seed dispersal of western and Utah junipers: the role of scatter-hoarding rodents.
The dispersal of Juniperus seeds is generally attributed to frugivores, both avian and mammalian. Junipers produce female cones with a husk enclosing the seeds that closely resemble fruit, thus they are often referred to as berries. These cones differ among juniper species with some species …
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Effects of Seasonal Burns on Avian Foraging in a Central Texas Ashe Juniper-Live Oak Savanna
North American grassland birds have been declining for the past three decades. Loss of habitat from urbanization, agricultural land use, and encroachment of woody species may account for this decline. Prescribed burning is one method for restoring remnants of grassland habitat, typically performed …
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Modelling the impact of Phytophthora austrocedri on UK populations of native juniper (Juniperus communis s. l.)
… oomycete pathogen, Phytophthora austrocedri, on juniper (Juniperus communis). I first surveyed potential abiotic and biotic drivers of disease severity across three, geographically separate juniper populations with different infection histories. In all populations, disease severity increased with …
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Change in piñon-juniper woodland cover since Euro-American settlement: expansion versus contraction associated with soil properties
… 1900s, including in the widely distributed piñon-juniper vegetation type of the U.S. Southwest. Fire suppression and grazing are often cited as the main drivers of these historic changes and have led to extensive tree-reduction treatments across the region. However, much of the scientific …
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Assessing Efficacy of Restoration Treatments in Juniper Savannas using Spatial Wavelets and Dot Grids on Aerial Photography
… range in the Western US, species of the genus juniperus are expanding onto open grass and shrublands and infilling open woodland areas. In Southern Arizona’s Clifton Ranger District, landscape-scale restoration treatments have been used to stall this expansion and reduce canopy-cover. This …
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Assessing Efficacy of Restoration Treatments in Juniper Savannas using Spatial Wavelets and Dot Grids on Aerial Photography
… range in the Western US, species of the genus juniperus are expanding onto open grass and shrublands and infilling open woodland areas. In Southern Arizona’s Clifton Ranger District, landscape-scale restoration treatments have been used to stall this expansion and reduce canopy-cover. This …
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Herptile Abundance and Diversity in Response to Seasonal Burning on a Central Texas Ashe Juniper-Live Oak Savanna
… herpetofaunal community of a central Texas Ashe juniper-live oak savanna. One trapping line, consisting of 1 drift fence, 2 pitfall traps and 2 funnel traps, was established on 12 treatment (6 on each burn treatment) and 6 control plots (unburned), for a total of 18 trap lines. Eighty-two …
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A Multi-Millennial Drought Reconstruction for West-Central New Mexico Using Rocky Mountain Juniper (<i>Juniperus scopulorum</i>, Sarg.)
… record from living and remnant Rocky Mountain juniper (<em>Juniperus scopulorum</em>, Sarg.) wood from Candelaria in west-central New Mexico is used to determine the temporal and spatial variability of scPDSI over the past two millennia (B.C. 492 to A.D. 2014). Our record indicates extreme …
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