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 53 for “"anthropogenic activity"”.
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Empirical Relationships between Water Quality and Agricultural Land Use in Rural Maine
Anthropogenic eutrophication of freshwater lakes due to land use change is a growing global problem with economic consequences, such as a reduction in shoreline property value. Managing eutrophication is of utmost importance in Maine, USA due to the large number of inland fresh waterbodies and …
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THERE IS NO PLANET B(EE): AN INTEGRATED APPROACH TO UNDERSTANDING DRIVERS OF POTENTIAL DECLINES IN BUMBLEBEE COMMUNITIES
Global climate change, anthropogenic activity, and pollution all threaten the core functions of Earth’s biotic systems. Of those core functions, pollinators, particularly insect pollinators, are key to the functioning of most terrestrial ecosystems. Bumblebees (Hymenoptera: Apidae: Bombus) …
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Molecular and cellular investigations of photosynthesis driven carbon fixation in the seagrass Zostera muelleri
… subjected to changes through tidal patterns and anthropogenic activity. Global seagrass coverage is declining worldwide, mainly driven by decreasing water quality due to anthropogenic activity. Therefore, there is an urgent need to better understand seagrass biology, particularly the way their …
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The dynamics of ¹³C in several New Zealand lakes
… palaeoenvironment. (iii) Quantify the effect of anthropogenic activity on the productivity of Hamilton Basin lakes. The viability of this project was assessed by monitoring the dissolved inorganic carbon chemistry of an eutrophic pond during a period of high insolation and algal productivity. …
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Quantifying the Ecosystem Metabolism of a Tidal Estuary as a Consequence of Aeration
As anthropogenic activity affects shallow estuaries it is imperative to quantify how these systems respond to changing conditions. Ecosystem metabolism is an integrative, metric to measure how ecosystems change, and can act as the focus of comparative experiments. We leveraged an aeration system, …
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The role of dispersal networks in structuring biotic communities: A tale of streams and metacommunity theory
… be affected differently than mainstem streams by anthropogenic activity and as such, management strategies and restorations may need to be specifically tailored to address the relative influences of local and regional processes at varying points within a stream network.
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Biotic and abiotic factors influencing the invasion success and ecological impacts of the Pacific oyster, Crassostrea gigas
… susceptible to invasive species due to increased anthropogenic activity. Invasive species can have severe ecological impacts on recipient ecosystems causing changes in biodiversity, habitat complexity and species interactions. After being introduced for aquaculture purposes worldwide, the Pacific …
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Caracals as sentinels for metal exposure in a human-transformed landscape
Urbanisation and associated anthropogenic activity release large quantities of metallic elements and metalloids into the environment. Due to their toxicity, environmental persistence and bioaccumulative nature, these chemical pollutants threaten wildlife and human health. As urbanisation increases …
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Ecological Conservatism and Traits Predict Introduction Risk and Co-Occurrence for the Flora of Chicago
Human activity over the past century has dramatically reshaped global plant diversity and distribution. The degradation of natural habitats and redistribution of plant species has changed the makeup of plant communities, generally leading to increased homogenization and decreased biodiversity. …
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Using wildlife to biomonitor for antimicrobial resistance in the Scottish environment
… in those catchments with greater levels of anthropogenic activity. In isolates from both wild deer and freshwater invertebrates, we observed a population-wide shift in the phenotypic resistance for some antimicrobials, indicating that the use of bespoke cut-off values for the determination …
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Avifauna and Anthropogenic Forest Disturbance in Two Biodiversity Hotspots.
… of this thesis is to examine the impact of anthropogenic forest disturbance on avifaunal communities in two biodiversity hotspots- lowland tropical forest in the Lambusango Forest Reserve within the Wallacean archipelago and Neotropical cloud forest in Cusuco National Park, Mesoamerica. Both …
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Artificial Night Lighting and Anthropogenic Noise Alter Animal Activity, Body Condition, Species Richness, and Community Structure
… pollution from artificial night-lighting and anthropogenic noise have increased at a dramatic rate over the last several decades. Alterations to the sensory environment have been found to affect wildlife in a wide variety of ways including behavioral changes, physiological responses, changes …
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Princess Vlei : what diatoms can tell us about spatial and temporal heterogeneity in an urban wetland
… degraded and destroyed largely as a result of anthropogenic activity. Monitoring and assessment are required to maintain functional ecosystems and the valuable services they provide. Surface sediment cores were taken from 4 points around an urban wetland (Princess Vlei) on the Cape Flats, Cape …
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Muddy memories : environmental change at Hluhluwe Imfolozi Game Reserve, KwaZulu-Natal, South Africa - evidence from diatoms
… eutrophication of the lake, a consequence of anthropogenic activity in the region. The diatom sequence from Phindiswene provides a high resolution climatic proxy for the critical period covering the latter stages of the Little Ice Age (LIA), post LIA warming, and recent increasing …
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Assessing the utility of open-source data in exploring benthic biodiversity in mining concessions off the South African coast
Extractive activity in the marine realm is a well-recognised pressure on the marine environment, particularly for the preservation of biodiversity (Majiedt et al. 2019). Data that are openly available, from repositories, guides and within other studies, are a growing resource available to …
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Understanding the ocean carbon and sulfur cycles in the context of a variable ocean : a study of anthropogenic carbon storage and dimethylsulfide production in the Atlantic Ocean
Anthropogenic activity is rapidly changing the global climate through the emission of carbon dioxide. Ocean carbon and sulfur cycles have the potential to impact global climate directly and through feedback loops. Numerical modeling, field and laboratory studies are used to improve our mechanistic …
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Constraining natural and anthropogenic disturbances in the delivery of coastal ecosystem services
… undergoing rapid degradation due to natural and anthropogenic pressures. This thesis seeks to understand how disturbances impact salt marsh and estuarine ecosystem functioning in order to refine their role in coastal ecosystem service delivery and predict future resilience. Salt marsh survival …
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THE INFLUENCE OF THE INVASIVE CHINESE TALLOW (TRIADICA SEBIFERA) LEAF LITTER ON AQUATIC CHEMISTRY AND MICROBIAL COMMUNITY COMPOSITION
<p>Global climate change and anthropogenic activity have facilitated the movement and invasive potential of nonnative plants in native environments. These invasions can have negative effects on ecosystem diversity and function. The nonnative and invasive plant, Chinese Tallow (<em>Triadica …
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Landscape forcing mechanisms on Quaternary timescales: The Tabernas Basin, SE Spain
… effects of lithological controls coupled with anthropogenic activity in the basin catchment.
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Productivity and carbon sequestration potential of seagrass ecosystems in the eastern Aegean Sea
… been increasing at ever faster rates, fueled by anthropogenic activity. Natural ecosystems,which typically form net autotrophic habitats such as seagrass meadows, could be crucial to counteracting CO₂ emissions. Increased fragmentation of Posidonia oceanica seagrass meadows within the eastern …
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