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 “"Northern Andes"”.
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Evaluating the Controls of Neogene Exhumation in the Tropical Northern Andes (colombia)
… 1, I studied the Eastern Cordillera of the Northern Andes, a mountain range located in Colombia in the tropics of South America. To obtain exhumation rates, I used thermochronology, which is a method that records—over timescales of millions of years—the rate at which rocks located at great …
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Diversity, Ecology, And Conservation Of Bird Communities Of Polylepis Woodlands In The Northern Andes Of Peru
… is that of Polylepis forests in the High Andes (> 3,500 m). Unfortunately, the ecology of birds associated with Polylepis forest, especially endemic and threatened species, remains poorly known. This gap in knowledge is worrisome given that climate models project that future conditions …
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Early patterns of Andean diversification, genomic and color patterns variation across the Metallura tyrianthina complex of the Northern Andes
… gran variedad de nichos de la cordillera de los andes ha contribuido a la formación y mantenimiento de la asombrosa diversidad genética y morfológica de las aves tropicales, promoviendo dos mecanismos de especiación. El primero consiste en la acumulación de mutaciones por deriva genética en …
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Cenozoic foreland-basin evolution in the northern Andes : insights from thermochronology and basin analysis in the Eastern Cordillera, Colombia
… While widely studied in the central and southern Andes, the spatial and temporal evolution of the Cenozoic foreland basin system in the northern Andes has received considerably less attention. This is in part due to the complex geodynamic boundary conditions, such as the oblique subduction and …
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Volcanic Activity and Human Occupation of the Northern Andes: The Application of Tephrostratigraphic Techniques to The Problem of Human Settlement in The Western Montana During The Ecuadorian Formative
This dissertation includes two related studies. The first study applies tephrostratigraphic techniques to correlate and source subaerial fallout tephra deposits which mantle Formative Period archaeological sites in the western montana and the Quito basin of Pichincha Province, Ecuador. Excavations …
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Mesoproterozoic Basement From The Central And Southern Appalachians Reveal High-temperature Magmatic Conditions And Non-laurentian Origin Of Earth’s Most Zircon Fertile Magmas
… north to southern New York, as well as from the northern Andes in southern Colombia. Zircon was extracted from these rocks to exploit its propensity to incorporate several isotopic tracers useful in determining age, petrogenesis, and thermal conditions during crystallization. These include …
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Mesoproterozoic Basement From the Central and Southern Appalachians Reveal High-temperature Magmatic Conditions and Non-laurentian origin of Earth's Most Zircon Fertile Magmas
… north to southern New York, as well as from the northern Andes in southern Colombia. Zircon was extracted from these rocks to exploit its propensity to incorporate several isotopic tracers useful in determining age, petrogenesis, and thermal conditions during crystallization. These include …
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Revised distributional estimates for the recently discovered olinguito (Bassaricyon neblina), using museum and science records
… hotspots with high endemism such as the Northern Andes. The olinguito (Procyonidae: Bassaricyon neblina) is a recently described, medium-sized carnivoran found in Northern Andean cloud forests. A preliminary distributional model was published along with the original description, and I …
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3D Modelling of Faulting and Intrusion of the Nevado del Ruiz Volcano, Colombia
… Nevado del Ruiz stratovolcano is located in the Northern Andes Mountain Range of Colombia. The area has been evaluated for its geothermal potential for the past decade. Geothermal energy, once implemented, has been proven to be a stable source of baseload energy. However, geothermal projects are …
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Sex-specific investment in incubation and the reproductive biology of two tropical antbird species
… between two tropical antbird species in the northern Andes of Venezuela. We found that males and females apportion reproductive effort differently between these two species, but that male contributions of time and incubation effort were generally greater than for north temperate species which …
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Sex-specific investment in incubation and the reproductive biology of two tropical antbird species
… between two tropical antbird species in the northern Andes of Venezuela. We found that males and females apportion reproductive effort differently between these two species, but that male contributions of time and incubation effort were generally greater than for north temperate species which …
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Evolutionary Assembly of the Neotropical Montane Avifauna
… in disjunct geographic areas (e.g., Southern Andes, Northern Andes, or Central American mountains), and subsequently occupied the entire Neotropical montane region. In the fourth chapter, I conducted a more in-depth investigation of the role niche breadth and elevational distribution on …
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Cenozoic Tectonic Evolution of the Eastern Cordillera and Adjacent Basins
… range.</p> <p>GPS results show that the North Andes is escaping northeastward relative to stable South America. The driving mechanism for this "escape" is subduction of the aseismic Carnegie Ridge in the Colombia-Ecuador trench. Slip estimates suggest that the ridge arrived at the trench prior …
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The changing face of Andean peatlands: the effects of climate and human disturbance on ecosystem structure and function
… a forecasting model to describe the dynamics of northern Andean peatlands. Past vegetation and historic production and decomposition rates were estimated from <super>210</super>Pb chronologies. Results indicate a strong effect of the interaction between elevation and the intensity of human …
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Mafic magmatism in the Eastern Cordillera and Putumayo Basin, Colombia : causes and consequences
… in the regional tectonic setting of the Northern Andes. The magmatic rocks cut the Cretaceous sedimentary succession of black shales and marlstones that crop out in both flanks of the Eastern Cordillera. The studied rocks were classified as gabbros (Cáceres, Pacho, Rodrigoque), tonalites …
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Fire Ecology of Northern Andean grasslands: Estimating recent fire history and its impact on páramo plants
The páramo grasslands 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 …