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 14 of 14 for “"Long Term Ecological Research"”.
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Soil geomorphology of the eastern Sevilleta Long Term Ecological Research Site
<p>Soils in the arid to semi-arid piedmont landscapes of central New Mexico were examined in order to evaluate surficial processes and landscape evolution in the central Rio Grande Rift. These soils were found to contain key information regarding pedologic and geomorphic responses to climate …
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Plant Assemblage Structure on Barrier Island ‘Pimple’ Dunes at the Virginia Coast Reserve Long-Term Ecological Research Site
… Island 'pimples', small, rounded dunes forming along main dune ridges of the barrier islands. There are distinct plant assemblage zones found on pimples, although most of these dunes are 10–20 m in diameter. Hypotheses of the study were that fresh water availability was a main determinant of …
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Controls over the distribution of soil micro-invertebrates in the McMurdo Dry Valleys, Antarctica
… and high salinity. In this thesis I combine long-term ecological data with spatial habitat modeling to investigate the environmental drivers of micro-invertebrate distributions and predict future distributions under variations in moisture availability associated with shifting climate regimes. …
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Groundwater Thresholds for Root Decomposition and the Relation to Barrier Island Ecological State Changes
… and freshwater. At the Virginia Coast Reserve-Long Term Ecological Research Site in Virginia, USA, thresholds to belowground decomposition rates were identified by measuring decay of native roots and rhizomes at 32 elevations in relation to mean annual groundwater levels (-0.356 – 1.937 m). …
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Microbial Communities Colonizing Leaves during Early Decomposition Stages
… leaves in June 2012 and at the Coweeta Long Term Ecological Research site using <em>Acer rubrum</em> and <em>Quercus prinus</em> leaves in June 2013. Laboratory trials using the same leaf types were set up in experimental chambers to model the systems found in these two regions. Decay …
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Ascomycetes From North Temperate Lakes in Wisconsin
… was carried out. These lakes are part of the Long Term Ecological Research (LTER) project and have been the subject of limnological studies since the early 1900's. Our knowledge of freshwater ascomycetes is fairly recent and based on studies done in the past 50 years. Freshwater ascomycetes …
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An investigation on humpback whales' distribution in relation to Antarctic sea ice in the IDCR/SOWER dataset
… distribution and behaviour is fundamental. Long-term ecological research offers the potential to understand ecological interactions and variability therein, over time scales relevant to both the life history of the animals and their physical environment. Implemented to assess the …
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Prairie dogs, plants, and pollinators: tri-trophic interactions affect plant-insect floral visitor webs in shortgrass steppe
… altered pollinator habitat, specifically in terms of bare ground cover and floral resources, on northeastern Colorado's Pawnee National Grassland, in 2003 through 2005. I also measured changes in habitat utilization by insect floral visitors on and off prairie dog colonies, and assessed …
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The Role of Nitrogen Availability, Hydroperiod and Litter Quality in Root Decomposition Along a Barrier Island Chronosequence
… between biotic and abiotic pools. Traditional research emphasizes above ground decomposition processes and, by inference, extends these findings to below ground systems. The study, conducted along a southeastern Atlantic Coast barrier island dune and swale chronosequence (Virginia Coast Reserve …
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Fire and herbivory effects on soil organic carbon stocks and soil greenhouse gas emissions from South African grasslands and savannas: Implications for global change
… other soil and environmental variables from Long-Term Ecological Research sites within a South African grassland and savanna. Four fire treatments distinguished by fire frequency were used (annual, biennial, triennial and no fire) while the presence or absence of wild herbivores represented …
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The Sleepless Forest Observers : Ecologists are using remote observation to advance their understanding of environments. Are they losing something in the process?
… using remote observation more and more in their research. “The explosion is happening now,” says Taal Levi, an ecologist at OSU who studies quantitative wildlife ecology, conservation, and environmental genetics at the Andrews. A review article published in Frontiers in Ecology and Evolution …
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Long-term analysis and appropriate metrics of climate change in Mongolia
… addresses three important issues related to long-term climate change study in Mongolia. Mongolia is one of the biggest land-locked countries in Asia and 75-80 percent of the land is rangeland, which is highly vulnerable to climate change. Climate will affect many sectors critical to the …
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Environmental controls on the abundance, diversity, growth, and activity of ammonia-oxidizing microorganisms in temperate forest soils
The goal of my dissertation research was to investigate the structure and function of ammonia-oxidizing microbial communities in temperate forest soils. Accomplishing this goal required a hybrid approach: I used modern molecular biology techniques alongside soil biogeochemical measurements and …
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Revisiting Aloe dichotoma’s suitability as an indictor of climate change in southern Africa
… vulnerability to climate change was used to determine A. dichotoma’s exposure, sensitivity, and adaptive capacity to climate change impacts. First I evaluated A. dichotoma’s exposure to climate change by independently assessing historical rainfall and temperature records of the longest possible …