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 21 for “"Landscape Fragmentation"”.
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Landscape Fragmentation and Grassland Patch Size Effects on Non-game Grassland Birds in Xeric Mixed-grass Prairies of Western South Dakota
… 1960’s. These declines have been attributed to landscape fragmentation, loss of grassland habitats, and the size and isolation of remaining grasslands. The purpose of this study was to inventory non-game birds on xeric mixed-grass prairies of various sizes in fragmented and non-fragmented …
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Abundance and Nesting Success of Acadian Flycatchers (Empidonax Virescens) at Different Scales of Fragmentation in Illinois, United States of America
… vegetation structure and composition rather than fragmentation may influence nesting success and populations. I measured nest concealment, complexity and heterogeneity of vegetation in the vicinity of the nest, and the plant communities in which the nests were located. Acadian Flycatcher nesting …
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Territorial Challenges and Sustainable Regional Development. A mixed-method approach
… Chapter 2 tests whether Protected Areas reduce landscape fragmentation using a boundary-based regression discontinuity design on CORINE Land Cover (1990–2018) and the MESH metric, finding robust reductions inside parks but rapid attenuation outside borders. Chapter 3 treats Protected Areas as …
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USING LANDSAT IMAGERY TO EVALUATE LANDSCAPE-LEVEL IMPACTS OF NATURAL GAS FIELD DEVELOPMENT: TAZOVSKY PENNINSULA, RUSSIA, 1984-2007
… on the adjacent tundra using three methods: a landscape fragmentation analysis, mean and change in mean NDVI analyses, and a cross-tabulation analysis. These analyses show that the tundra has become increasingly fragmented during the study period, and that mean NDVI values in areas adjacent to …
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USING LANDSAT IMAGERY TO EVALUATE LANDSCAPE-LEVEL IMPACTS OF NATURAL GAS FIELD DEVELOPMENT: TAZOVSKY PENNINSULA, RUSSIA, 1984-2007
… on the adjacent tundra using three methods: a landscape fragmentation analysis, mean and change in mean NDVI analyses, and a cross-tabulation analysis. These analyses show that the tundra has become increasingly fragmented during the study period, and that mean NDVI values in areas adjacent to …
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Influence Of Landscape Spatial Patterns And Land Use Planning On Grassland Bird Habitat Occupancy In Chester County, Pennsylvania
… bird decline corresponds to habitat loss, landscape fragmentation, agricultural intensification, and changes in land management. In areas where farmland is being converted, the presence or absence of grassland birds can be used to assess the availability of habitat across the landscape. …
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Assessing and Evaluating Recreational Trails on Public Lands
… habitat, spread invasive species, and fragment landscapes. The second article (Chapter 3) examines informal and formal trails within Great Falls Park, VA, a sub-unit of the George Washington Memorial Parkway, managed by the U.S. National Park Service. This study sought to answer three specific …
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Avian Community Structure Associated With Woodland Habitats in Fragmented and Unfragmented Lanscapes in Western South Dakota
Grassland fragmentation to increase agricultural production is decreasing habitats for grassland birds at alarming rates in the northern Great Plains. Establishment of planted woodlands (e.g., shelterbelts and windbreaks) has further fragmented remaining grasslands and created abrupt boundaries …
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Multitemporal mapping of burned areas in mixed landscapes in eastern Zambia
… by analyzing the fine-scale seasonal patterns of landscape fires in eastern Zambia. A new approach for mapping burned areas uses multitemporal image analysis with a fuzzy clustering algorithm to automatically select spectral-temporal signatures that are then used to classify the images to produce …
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Ecology of the Verreaux's eagle Aquila verreauxii in natural and agriculturally transformed habitats in South Africa
… has a negative impact on biodiversity. Owing to landscape fragmentation and reduced prey availability, predators that inhabit transformed areas are usually forced to increase hunting effort or diversify their diet and this can have negative consequences for fitness or demographic parameters. …
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Ecological interactions of natural processes and new urban form : a landscape ecological analysis fo the change of urban and natural patterns in eastern-Taipei metropolitan fringes
… the technology of GIS and the principles of landscape ecology, some quantitative and spatial analyses are applied here to verify the complicated non-linear relationship between city form, forest patch shape and hydrological effects in the case study of eastern Taipei. Some landscape …
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Le infrastrutture verdi nei paesaggi del vino: Linee guida alla pianificazione
… A significant driver of this depletion is landscape fragmentation, whose solution has been envisaged by European policies through strategies including the adoption of the so-called green infrastructures, i.e. ensembles of green areas and nature-based solutions capable of delivering benefits …
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Connecting the Plots: Anthropogenic Disturbance and Mojave Desert Tortoise (Gopherus agassizii) Genetic Connectivity
… processes like movement and incorporating landscape enhances our understanding of genetic patterns. For tortoises a historically connected landscape coupled with limited dispersal produced a pattern of isolation-by-distance. This dissertation highlighted more recent genetic connectivity by: …
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Comparative assessment of flood resilience in urban and rural environments: a case study of Chennai City and Wardha River Sub-basin, India
… and land conversion exacerbate surface runoff. Landscape fragmentation analysis using machine learning and the FRAGSTATS programme reveals substantial forest loss and habitat degradation between 2010 and 2025, compromising ecological connectivity and increasing flood risks. Hypothetical …
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Evaluation, assessment, and determination of risk to high trophic level piscivores in the Mid-Atlantic: A spatial, biological, and comparative case study of mercury in Virginia bald eagle populations
… as a function of the physical and anthropogenic landscape. Due to it's location in the food chain this species is susceptible to a wide range of contaminants (xenobiotics), particularly those that bioaccumulate and biomagnify as they move through the food chain. Previous research has indicated …
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Landschaftszerschneidung : Anwendung und Vergleich verschiedener methodischer Varianten am Beispiel des Landkreises Havelland (Brandenburg)
Analyse der Landschaftszerschneidung und -fragmentierung, Untersuchung und Anwendung verschiedener Zerschneidungsgeometrien und deren Implementierung für unterschiedliche Indikatoren. Die Ergebnisse des methodischen Vergleiches für den Landkreis Havelland sollen die Grundlage für die Auswahl der …
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Plant community assembly and biodiversity: a spatio-temporal perspective
… of the sites and their surrounding landscape explain the current diversity patterns was quantified. Temporal changes in the multiple facets of diversity, and assembly processes that drive these changes, were investigated along a more than 300 year long chronosequence representing an …
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Climate-driven growth of croplands and grasslands: analysis and modeling at regional scale
… external factors - such as land cover changes, landscape fragmentation, etc. - need to be minimized to ensure that the variations in the NDVI signal can be attributed to climate variability. Preliminary time series analyses are then performed to characterize the long-term climate and vegetation …
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Evaluation of Modis Products Over Four European Ecological Study Sites
… land cover and LAI products for European landscapes which are highly fragmented and not necessarily homogeneous at the 1 km scale characteristic of MODIS products. A stepwise analysis has been carried out for reflectance, land cover and LAI products, comparing results from ground truth …
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