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 31 for “"anthropogenic impact"”.
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Coevolutionary dynamics under anthropogenic impact in intensively managed landscapes
Anthropogenic activities have encroached on floodplains for infrastructure and modified the landscapes for agriculture. Over time these become intensive and extensive to support increasing societal and economic demand. For example, landscapes in the U.S. Midwest have lost wetlands and native …
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A palaeolimnological study of the anthropogenic impact on dissolved organic carbon in South Swedish lakes
… have been published linking them to declining anthropogenic atmospherically deposited sulphur. Others have argued that increases in DOC content are a consequence of changes in climate, land use or land management practices. The work presented in this thesis concentrates on identifying the major …
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Algal and protozoan response to Holocene climate change and anthropogenic impact: a case study from Sluice Pond, MA
Sluice Pond is a small (18 ha) and deep (Zmax 20.0 m) partially meromictic, pond in Lynn, Massachusetts that contains a diverse dinocyst record since the early Holocene. High dinocyst concentrations, including morphotypes not previously described, as well as the preservation of several specimens of …
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The Development and Evaluation of an Index of Biotic Integrity for Small Lakes in Western and Central New York
… estimate the condition of the lakes in terms of anthropogenic impact. The results of the 181 assessment were evaluated via comparison with assessments based on two other methods: a standard rating based on water quality and watershed data and a modification of the Trophic State Index (TSI). …
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Trophic model-generated indicators of the southern Benguela ecosystem for communicating with fisheries managers
… to view how pressures (environmental or anthropogenic) impact upon the ecosystem, as well as its individual components. An updated trophic model representing the 2004-2008 period within the southern Benguela ecosystem was constructed.This current model complements historic 1900s, 1960s …
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Geochemical tracers in the deep-sea and the North Sea
… flux prevails. In the North Sea, mainly the anthropogenic impact on the coastal environment was studied. Heavy minerals indicate higher currents velocities, leading to a loss of fine fraction in recent tidal flat sediments. Today, heavy metal rich clay particles are only to a small extent …
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Effect of Earthquake and Human Migration on Land Cover and Mass Wasting from The 2010 Haiti Earthquake
… maps of pre- and post-earthquake. To assess the impact of anthropogenic activities, we employed a maximum likelihood method to produce LULC maps from Landsat images for the dry seasons from 2002 to 2015 over the span of 2 or 3 years. Landslide inventory maps were created with ArcGIS and Google …
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Beach-dune interactions and a new cycle of foredune evolution, Gulf County, Florida
… location that has experienced relatively little anthropogenic impact. The study sites were chosen for their variety of erosion/accretion rates, exposure to wind and waves, and foredune heights. Topographic surveys, vegetation surveys, wave data, and archival research were all used to analyze the …
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Heavy Metal Distribution Across Three Georgia Estuaries Using Coastal Sharks As Sentinel Species
… species. Estuaries are exposed to a number of anthropogenic impacts, including heavy metal contamination from human activities. However, few studies have examined heavy metal distribution within Georgia’s estuaries and how intact salt marsh ecosystems could play a role in filtering and …
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The hydrological and limnological characterization of two Canadian water catchments sensitive to anthropogenic influences: Crawford Lake, Ontario and Old Crow Flats, Yukon
… components and the effects of climate and anthropogenically- induced landscape changes on local hydrology, geochemistry, and limnology. Crawford Lake is a small meromictic lake near the Niagara Escarpment, whose bathymetry and wind-protected shores impede seasonal turnover, maintaining …
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The distribution of the desert rain frog (breviceps macrops) in South Africa
… suitability, food availability and competition, anthropogenic disturbance, and historical distribution patterns are discussed in terms of their impact on B. macrops distribution however no significant correlations are found. In addition, examination of the available habitat within South Africa …
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Does fish health matter? The Utility of Biomarkers in Fish for Environmental Assessment
… systems [III-IV] with, presumed, high and low anthropogenic impact, respectively. The methodology worked well in the water with high anthropogenic impact, and it was shown that rainbow trout at certain sites were exposed to increased levels of pollutants. Furthermore, this information was …
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Characterizing bacterial antibiotic resistance, prevalence, and persistence in the Marine Environment
… humans. Despite a relatively short time of use, anthropogenic use of antibiotics has increased natural levels of antibiotic resistance, which has caused a looming antibiotic resistance crisis, where antibiotics may not work. Understanding resistance patterns is critical to allow for continued …
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Late Cainozoic rainforest vertebrates from Australopapua: evolution, biogeography and extinction
… In light of predicted climatic change and anthropogenic impact, it is imperative to determine the trajectories of Australia‟s modern flora and fauna. In particular, mesothermic rainforest faunas are among Australia‟s most vulnerable terrestrial biota under threat from both natural and …
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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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The Threat and Cascade Method of estuarine health assessment: a logical sequence from human impact to biological degradation via system physics and chemistry
… is presented. It is based on the assumption that anthropogenic impact is the causative variable when considering negative impacts on estuarine health. The methodology follows a logical cascade of estuarine health assessment protocols. The first step in the Threat and Cascade Method (TaCM) …
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Method Development For Concentration Measurements of SVOCs and Analysis of Ambient Samples
… three classes of SVOCs, particularly in samples impacted by the plume suspected to originate from the Syncrude and/or Suncor mining and upgrading sites. The carbon preference index (CPI) values obtained for these Oil Sands samples also indicated a substantial anthropogenic impact, even for the …
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