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 16 of 16 for “"Alpine ecosystems"”.
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Understanding hydrological processes at different scales through stable water isotopes: a focus on alpine ecosystems
L'abstract è presente nell'allegato / the abstract is in the attachment
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Weathering and soil properties on catenary sequences in forest and alpine ecosystems of the central Rocky Mountains
… weathering and soil development in the Mountain Ecosystems of the Fraser Experimental Forest (FEF), Colorado. The research outlined and presented in this dissertation is preceded by a short narrative on soil forming properties, hillslope models, and assessing weathering in soils. The work …
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The Effect of Seasonal Vegetation Changes on Habitat Suitability and Predation Risk of the Vancouver Island Marmot
… small and fragmented population. They live in subalpine meadows, exclusively on Vancouver Island, Canada, but will also colonize logged habitats at lower elevations, which become population sinks for the species. Tree encroachment and vegetation shifts in these habitats are likely affecting …
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VEGETATIVE REPRODUCTION BY LAYERING VERSUS SEXUAL REPRODUCTION IN A SPRUCE-FIR FOREST AT ALPINE TREELINE, MEDICINE BOW MOUNTAINS, USA
Alpine ecosystems offer a unique opportunity to study tree species at the edges of their distributions and physiological limits. Clonal growth has shown to be an advantageous trait for woody species in alpine zones because it provides protection from high winds, freezing temperatures, and ice …
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Dust and Pleistocene Ice Ages: Eolian Sediments and Climate Change at Ziegler Reservoir, Snowmass Village, Colorado
… Colorado presents an opportunity to examine subalpine ecosystem response, during a relatively unknown period, in which climate conditions were similar to present. Finegrained sediments at Ziegler Reservoir represent continuous deposition between ~140–55 ka (thousand years before present), …
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Understanding the complex relationships between climate, vegetation, and foraging behavior of a climate-sensitive alpine mammal in order to explain patterns of persistence
<p>Mountain ecosystems offer substantial ecosystem services but are highly sensitive to climate change. The American pika (<em>Ochotona princeps</em>) serves as an indicator species of climate change and a model organism for studying its impacts on mountain mammals. Certain aspects of plant …
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Evolutionary perspectives on plant responses and sensitivity to environmental change
… evolutionarily rich, and ecologically vulnerable alpine ecosystems. My PhD aims to narrow the uncertainty about how plant lineages with a range of lowland and alpine species will be impacted by global change by studying the historical biogeography, trait and species diversification, and ecological …
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The effects of temperature and moisture on alpine microbial processes across a gradient of soil development
Alpine ecosystems are being transformed by global change. Climate change and atmospheric nitrogen deposition are exposing soils to novel temperature regimes, melting alpine glaciers, altering precipitation patterns, and directly introducing bioavailable nutrients. Because microbial communities are …
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Snowmelt Detection on Alpine Glaciers using Synthetic Aperture Radar Time Series
… regulate the geochemistry of sensitive aquatic alpine ecosystems. As snowmelt onsets sooner, lasts longer, and snowfields retreat due to increases in global temperature, the hydrologic dynamics of catchments draining HKH threaten to change the availability of surface freshwater resources for …
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Spatiotemporal Dynamics of Snow-Free Frost Exposure in the Western Cordillera Seasonal Snow Zones
In the mountain ecosystems of the Western Cordillera, seasonal snowpack provides insulation for soils and vegetation against freezing temperatures. While temperatures are warming overall, concurrent declines in snowpack are removing this protective thermal blanket. This may lead to events where the …
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Resurvey of a GLORIA Target Region in the Swiss National Park
… and affects life on earth. Especially mountain ecosystems are supposed to be highly sensitive to climate change due to the vertical compression of life zones, rough abiotic environment and limiting ecological factors. Therefore, the European Alps is one of the best observed ecosystems where many …
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Patterns and Disturbance-Induced Drivers of Plant Diversity and Endemism on High Elevation Islands
… reaching more than 1000m a.s.l. and possessing ecosystems ranging from coastal to alpine systems. The alpine treeline, as the borderline between forest and treeless alpine systems, is therefore fundamental in describing HEIs. Interestingly, I demonstrate that globally treeline elevation on HEIs, …
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A landscape approach to forecasting climate change impacts on geographic ranges and phenologies of plants in the Washington Cascades
… and hydrology pose unique risks to features of ecosystems that are economically and culturally important. Chapter one concerns the fundamental ecological processes that maintain the geographic range limits of plants, focusing on the role of climate and disturbance in setting contemporary range …
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Fire Ecology of Northern Andean grasslands: Estimating recent fire history and its impact on páramo plants
… of the Northern Andes are highly biodiverse ecosystems that provide ecosystem services for the millions of people that live in the region (Buytaert et al., 2011; Ramsay, 2014). These fragile alpine ecosystems are vulnerable to the impacts of global environmental change and land use change …
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A multi-scale exploration of the drivers and implications of germination strategy in Australian alpine plants
Alpine ecosystems are particularly sensitive to the effects of global warming because they are characterized by species adapted to low temperatures. Although adapted to low temperatures, alpine plants may still be capable of persisting under a changing climate and this will largely be dependent on …
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A multi-scale exploration of the drivers and implications of germination strategy in Australian alpine plants
Alpine ecosystems are particularly sensitive to the effects of global warming because they are characterized by species adapted to low temperatures. Although adapted to low temperatures, alpine plants may still be capable of persisting under a changing climate and this will largely be dependent on …