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 142 for “"high elevation"”.
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Grazing and Climate Effects on High Elevation Meadow Resources
… across grazing and climatic gradients in high-elevation meadows. The methods include both on the ground and remotely sensed tools, and the correlations between them are assessed. The results suggest that field determined phenology, phenocam Green Chromatic Coordinate (GCC), Phenocam …
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The post-breakup evolution of the western Indian high-elevation passive margin
The tectonic development of the Western Indian high-elevation passive margin is complex. At least two major rifting events (India/Madagascar and India/Seychelles) and a major hotspot (The Reunion plume) are believed to have been instrumental in the formation and development of the margin. However, …
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Sulfate Dynamics and Base Cation Release in a High Elevation Appalachian Forest Soil
… categories: (i) shallow surface horizons with high organic matter and little Fe oxide content which had little ability to adsorb additional SO₄²⁻ and low capacity to retain SO₄²⁻; and (ii) deeper subsurface soils with low organic matter and high Fe oxide content which could adsorb SO₄²⁻ at …
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Persistence potential of Great Basin high-elevation conifers under novel climates and disturbance regimes
… and distribution of forests. Focusing on the high-elevation pines of the Great Basin, I evaluate seedling success across a range of establishment conditions to assess the potential for ongoing natural regeneration and future reforestation interventions. Using observational and experimental …
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Patterns and Disturbance-Induced Drivers of Plant Diversity and Endemism on High Elevation Islands
… I introduce and define the concept of high elevation islands (HEI), which – in my opinion – are ideal research objects to address ecological and biogeographic questions. I intend to bridge the gap between island biogeography (i.e. by focusing on the global scale) and island ecology …
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The Response of High Elevation Wetlands to Past Climate Change, and Implications for the Future
<p>As part of the ongoing investigation of mid-latitude fens in Colorado by University of Denver paleoenvironment researchers, research directed at examining the response of mid-latitude subalpine fens to past climatic events potentially analogous to modern anthropogenic climate change was …
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Taxonomy, genesis, and parent material distribution of high- elevation forest soils in the southern Appalachians
High-elevation spruce-fir forests in the southern Appalachians may potentially be in a state of decline as a result of either natural or anthropogenic causes. Soils were investigated in areas representative of 117 permanent intensive field plots established to evaluate changes in forest composition …
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Species Distribution and Richness Patterns of Bird Communities in the High Elevation Forests of Virginia
… are governed by large scale processes. The high elevations forests in the Southern Appalachians represent a series of naturally fragmented islands that harbor many isolated populations of species at the southern limits of their range. Understanding the governing forces of population dynamics …
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Studies on the Odonata and Trichoptera of high-elevation lakes of northern Colorado and southern Wyoming
… specific aquatic insect species distributions at high-elevation lentic habitats in Northcentral Colorado and Southern Wyoming. I provided occurrence records of the Hudsonian Emerald dragonfly (Somatochlora hudsonica, HED) in Northcentral Colorado and Southern Wyoming. The HED is the only Colorado …
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Impacts of mountain pine beetle outbreak on biogeochemical cycling in a high elevation whitebark pine ecosystem
… poorly understood. This is especially true in high elevation whitebark pine (WbP) (Pinus albicaulis) ecosystems of western North America. WbP has been described as a keystone species, providing a critical food source and regulating hydrologic regimes. However, widespread WbP mortality caused by …
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Impacts of mountain pine beetle outbreak on biogeochemical cycling in a high elevation whitebark pine ecosystem
… poorly understood. This is especially true in high elevation whitebark pine (WbP) (Pinus albicaulis) ecosystems of western North America. WbP has been described as a keystone species, providing a critical food source and regulating hydrologic regimes. However, widespread WbP mortality caused by …
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Study of the properties, classification, and woodland site quality for high elevation soils in western Virginia
… woodland site quality of timber stands to be higher than expected for the soils traditionally mapped in the area. Assessment of soil temperature data indicates the mesic-frigid boundary occurs at approximately 1200 m. This boundary is not absolute, and allows for adjustments as appropriate. …
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Mountains as Crossroads: Temporal and Spatial Patterns of High Elevation Activity in the Greater Yellowstone Ecosystem, USA
… between inhabited spaces. Yet occupying high elevations may have been an adaptive choice for ancient peoples, as rapidly changing elevations also offer variation in climate and resources over a relatively small area. So what happens, instead, if we put mountain landscapes at the center of …
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Russian wheat aphid, Diuraphis noxia (Kurdjomov), ecology and reproduction on five noncultivated grass hosts in high elevation environments
… five noncultivated grass hosts was examined in high elevation environments. The objectives of the first study were to: 1) identify Russian wheat aphid occurrence and abundance on five common grass hosts at elevations between 1,829- 2,743 m during June-October; 2) monitor Russian wheat aphid …
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Soil Organic Carbon Variability by Aspect and Slope in the High Elevation Soils of the Southwest Virginia Mountains
… soils. However,the cool moist forests of the high elevations probably hold more C than any other mineral soils in Virginia. The objectives of the study were to determine the amount and variability of soil C across aspect and slope classes in a frigid temperature regime area of Tazewell County, …
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Ecological and taxonomic studies of the Russulaceae and other ectomycorrhizal Basidiomycetes in the high-elevation forests of the southern Appalachians
… than in hardwood forests. Productivity was highly variable among the three seasons studied because of climatic variability. Sporocarp abundance and frequency were positively correlated with basal area and density of mycorrhizal trees and were negatively correlated with fern cover in hardwood …
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Hermit Thrush (<em>Catharus guttatus</em>) and Veery (<em>C. fuscescens</em>) Breeding Habitat Associations in Southern Appalachian High-Elevation Forests.
… a new breeding bird in the Southern Appalachian high-elevation mountains, having expanded its range southward over the last few decades. Here it is sympatric with the Veery, a congeneric breeding resident. In order to more fully understand why the range expansion took place and to understand more …
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