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.
Results
Showing 1 to 20 of 502 for “"Environmental changes"”.
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Population and community responses to anthropogenic environmental changes
… ROAPs) to explore the effects anthropogenic changes have on plant communities and bird populations. Chapter one investigates the influence of nutrient deposition on native prairie grass communities. I show that soil phosphorus levels alter plant diversity by changing the degree to which …
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Environmental Changes in Eastern Lapland during the last 50 years
… depth and precipitation show less significant changes. Heat sum have from 1981 to 2021 increased with 247 °C days, indicating more active and growing trees. Birch leave development show indications of leave burst and developed leaves to occur at earlier date, over the years 1981-2021. Grouses, …
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Quaternary environmental changes in the fluvial and faunal history of central Northamptonshire
… and examines in detail associated patterns of environmental change in coarse sediments from which the ostracods were extracted. Stratigraphic, lithological and sedimentological data, supported by a study of geological maps, borehole logs and papers, are employed to produce a new hypothesis to …
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Landscape and environmental changes at Memphis during the dynastic period in Egypt
… and examines potential reasons for historical changes. Sedimentary records of 77 boreholes taken in the area of Mit Rahina are analysed to detect palaeoenvironmental conditions and palaeo-landscape features. Their interpretation is sustained by a multidisciplinary approach drawing together …
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New approaches to understanding functional traits and butterfly responses to environmental changes in Europe
… butterfly fauna of Europe are changing and these changes are not uniform across these species. Trait-based approaches are being used to explain these responses to environmental change over a range of temporal and spatial scales. These have generally focused on a limited subset of life-history …
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Modelling environmental changes in the Udzungwa Mountains of Tanzania through impact assessment on rainforest mammals
… the same time, knowledge on the factors driving changes and fluctuation in distribution and abundance is also critical. Nevertheless, gaining such insight is especially challenging for species living in patchy and fragmented landscapes, as is the case for most mammals in tropical forests. This …
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A study of the effects of environmental changes on the stress-strain properties of kaolinite
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Sanitary Engineering, 1961.
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Environmental changes and regime shift analysis in the southern Benguela using output from earth system models
… carbon emissions has triggered profound changes in Earth's climate, affecting marine ecosystems and fisheries globally. This study focuses on the southern Benguela, an integral region of the southern African Eastern Boundary Upwelling System (EBUS), investigating the potential impacts of …
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Predicting salmonid population ecology from individual fish responses to environmental changes: bridging behaviour, conservation and fisheries management.
… salmonid population responses to environmental change. A salmonid individual-based model is parameterised to predict fish distributions and growth as the modelling approach address the weaknesses of current models. Virtual forager parameters are derived from published …
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The role of glycogen Metabolism in the Adaptation to environmental Changes of the cyanobacterium Synechocystis sp. PCC 6803
… help Synechocystis sp. PCC 6803 adapt to environmental changes, enhancing the resilience of this model photosynthetic organism. By examining phosphohexomutases, that interchange the phosphate of glucoses, the work identifies the sll0726 as the main phosphoglucomutase. Cellular fitness is …
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The impact of global environmental changes on exceptional preservation, extinction, and recovery in the early Jurassic (late Pliensbachian-Toarcian)
… Jurassic there were significant perturbations in environmental conditions around the globe, such as thermal stress, low oxygen levels, higher nutrient concentration, and acidification in some parts of the ocean. Of particular importance are the Pliensbachian/Toarcian boundary event (~184.2 million …
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Soybean expansion in Brazil: A quantitative assessment of past technological and environmental changes and implications for future climate change
… a large-scale quantitative assessment of the changes in climate, photoperiod and technology experienced by soybeans during the expansion, and compare them with future climate expectations. A spatially explicit dataset on soybean harvested area and yields is developed. The photoperiod …
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Validation and use of novel techniques to study the impacts of large-scale environmental changes on the health of wild waterfowl
… provide historical information on responses to environmental changes over time if archived or museum specimens are available. However, a major criticism of the technique has been the limited support for the assumption that it reflects blood corticosterone levels during the period of feather …
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Sedimentological and geochemical evidence for late quaternary environmental changes in southern Africa : a case study of the mudbelt deposits off Namaqualand
… research is to contribute to the evidence for environmental change during the late Quaternary in the southern Africa from the analyses of continental shelf sediments and more specifically, to examine feasibility of using Namaqualand mudbelts as a key to understanding late environmental dynamics …
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Lateglacial to Holocene climatic and environmental changes in Europe : multi-proxy studies on lake sediments along a transect from northern Italy to northeastern Poland
… of past climate development to climatic changes on a larger spatial scale. The Lake Hańcza (NE Poland) sediment record was studied with a focus on reconstructing the early Holocene climate development and identifying possible differences to Western Europe. Following the initial Holocene …
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Effect of salinity and environmental changes on the fish community of the St Lucia Estuarine System with focus on the salinity tolerance of Oreochromis mossambicus (Mozambique Tilapia)
… study investigated the effect of salinity and environmental changes on the fish community structure of the St Lucia system during periods of mouth closure as well as after opening of the new beach channels connecting St Lucia to the Mfolozi system.Sampling was conducted from May 2008-Nov 2014 …
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The effects of organizational response on deprofessionalization: the case of stockbrokers 1975-1990
… a mediating factor in the relationship between environmental change and deprofessionalization of stockbrokers between the years 1975 and 1990. Both quantitative and qualitative content analysis are used to analyze 412 business news articles concerning three brokerage firms. It is hypothesized …
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Heterogeneous Entrepreneurial Action: A Knowledge Problem Approach
… dissertation explores the effects of external environmental changes, such as COVID-19, Artificial Technology, the NCAA's Rule Change on the use of Name, Image, and Likeness, on entrepreneurship. Given that these environmental changes vary—some are more sudden than others, they do not have the …
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