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 23 for “"Anthropogenic effects"”.
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Forces Structuring Caddisfly Communities: Biogeographical to Anthropogenic Effects
… from across the US and Canada, from which the effects of geography, seasonality, and urbanization were determined on family-level richness, abundance, diversity, and presence-absence of taxa. Though I expected the effects of urbanization to be mediated by geography, this was not the case. …
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Climate change and anthropogenic effects on shallow-water carbonate biogeochemistry
As a consequence of anthropogenic activities, future projections suggest that the saturation state of surface ocean waters with respect to carbonate minerals will decline during the twenty-first century owing to increasing atmospheric CO2. As a result calcareous organisms could have difficulty …
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Anthropogenic effects on site use and temporal patterns of terrestrial mammals in Harenna Forest, Ethiopia
… 0.04-0.18). I found more evidence of positive anthropogenic impacts on herbivore and omnivore occupancy than negative, while detection was influenced by habitat or landscape features, rather than by humans. Carnivore occupancy was largely unaffected by anthropogenic or habitat variables, but …
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Late Quaternary variability in coastal changes along the Texas Gulf coast
… subsidence, wave climate, offshore profile, and anthropogenic effects. The central Texas coast is characterized by stable barriers whereas the upper and south Texas coast is dominated by transgressive barriers. These changes along the Texas coast became prominent in the mid-late Holocene when the …
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Population Size of Blue-footed Boobies in Galápagos: Evaluation of Indications of Population Decline
… population reduction, probably by more than 50%. Anthropogenic effects such as introduced predators are unlikely to explain this decline, because islands with and without such factors exhibited the same low breeding. The poor reproduction seems to be linked to scarcity of food. Previous studies …
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Parametric Resampling Methods for Retrospective Changepoint Analysis
… periodic changes in the underlying model due to anthropogenic effects or natural phenomena. Several applications of changepoint analysis are investigated here. The use of inappropriate changepoint detection methods is first discussed and the need for a simple, flexible, correct method is …
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Ecology and Conservation of Shrubland Bird Communities in the Eastern Ghats of Indi
<p>Anthropogenic disturbance, in its multiple facets represents a major threat to biodiversity and habitat quality. Consequently, extensive research is guided towards understanding anthropogenic disturbance and their effects on wildlife for development of wildlife management plans. However, for …
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Effects of Disturbance History on Forest Soil Characteristics in the Southern Appalachian Mountains
… differences could be due to differential anthropogenic effects, particularly logging and associated erosion in the early 1920's. However, further study over multiple disturbed watersheds in the region, and of the distribution of sediments and colluvium within them would be required to test …
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Temporal variation in the coral reefs of the east coast of the inner gulf of Thailand
… and population growth, resultant anthropogenic effects have not yet stopped active coral accretion.
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Quaternary geology of the German North Sea and Western Irish Sea Mud Belt: revised stratigraphies, geotechnical properties, sedimentology and anthropogenic impacts
… is recognised as a period with increasing anthropogenic influence on the environment. Onshore records recording glacial/interglacial cycles as well as anthropogenic effects are limited. However, sites of sediment accumulation on the shallow continental shelf offer the potential to …
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Cavity ring down: Construction, validation and experiments measuring the optical extinction of pure clays and their mixtures with salts and carboxylic acids under a range of atmospherically relevant conditions
… gases, but contribute the largest uncertainty to anthropogenic effects on climate. To address these uncertainties, a cavity ring down spectrometer (CRD) was built and performance tests were conducted to validate its capabilities for measuring optical properties of laboratory generated, …
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Linking nitrogen biogeochemistry to different stages of wetland soil development in the Mississippi River Delta, Louisiana
… ecological communities. Here I tested how the anthropogenic effects of a climate-induced vegetation shift, an oil spill, and nitrate-enrichment regulate the principal environmental factors controlling nutrient biogeochemistry in wetland soils at different stages of development throughout the …
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Clean water: a long-term water quality monitoring network to evaluate restoration of Hickory Run at the Mt. Cuba Center
… is healthy, stable, and largely devoid of many anthropogenic inputs so commonly seen in water bodies throughout the Mid-Atlantic. Because of this the effects of these restorative efforts can be directly observed through rigorous water quality monitoring, and reasonable connections can be drawn …
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Biomolecular Controls on Calcium Carbonate Formation by Amorphous and Classical Pathways: Insights from Measurements of Nucleation Rates and Isotope Tracers
… chemistry over geologic time and by recent anthropogenic effects. This dissertation presents the findings from experimental studies of the thermodynamics and kinetics of multiple mineral formation processes, including nucleation and transformation from an amorphous phase. The kinetics of …
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On the Improvements of Boundary-Layer Representation for High Resolution Weather Forecasting in Costal-Urban Environments
… can be better utilized to quantify the anthropogenic effects of these modifications. Although these systems have improved forecasting near-surface weather conditions, a comprehensive approach to represent urban impacts on the PBL is still limited. Improved PBL representation can lead to …
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Responses of wild freshwater fish to anthropogenic stressors in the Waikato River of New Zealand
To assess anthropogenic impacts of point-source and diffuse discharges on fish populations of the Waikato River, compare responses to different discharges and identify potential sentinel fish species, we sampled wild populations of brown bullhead catfish (Ameiurus nebulosus, (LeSueur, 1819)), …
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Population ecology of wood ducks in Nevada under experimental manipulation of harvest
… demographic stochasticity and increasingly, anthropogenic effects. Management directed at specific vital rates, like per capita births or deaths, is often used as a tool to influence change in wildlife populations. I experimentally manipulated harvest regulations for wood ducks in Nevada, to …
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Historical changes on rocky shores in the Western Cape, as revealed by repeat photography
… climate change, intertidal invasion and direct anthropogenic effects. Images were sourced from books, members of the public and subject specialists and were selected based on their suitability. The sites of the images were identified and repeat photographs captured. The images depict the slow …
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Hydrogeochemical exploration at Tsumeb
… the cumulative frequency distribution. Although anthropogenic effects were apparent at both mines they were not severe and it was possible to be more confident about the prospective roles of the various chemical species in hydrogeochemical exploration for ores in the Otavi dolomites. These …
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The Effect of Boat Type on Bottlenose Dolphin (<i>Tursiops trucatus</i>) Behavior in the Mississippi Sound
… species in all contexts, it is vital to report anthropogenic impacts where longitudinal data is available, and doubly so where a dearth of information exists. The purpose of this study is to describe how dolphin behavior changed in the presence of boats in the Mississippi Sound between 2006 and …
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