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 47 for “"fragmented landscapes"”.
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Spatio-Temporal Connectivity in Dynamic Tropical Fragmented Landscapes
… that result in highly dynamic forested landscapes. These dynamical landscapes, when subjected to the current scenario of intense global change, poses particular challenges for biodiversity conservation in human-modified landscapes. This thesis provides insights towards (i) the …
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Fragmented Landscapes: An Archaeology of Transformations in The Pra River Basin, Southern Ghana
… and post-colonial periods. I examine this fragmented landscape using satellite remote sensing, archaeological pedestrian survey, diagnostic artifact analyses, and limited test excavations to identify and assess features and transformative processes.</p>
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Linking the landscape: legal and policy tools to promote connected habitats in fragmented landscapes
… to urban and agricultural land uses, humans have fragmented millions of acres of once-contiguous habitat. Fragmentation alters the spatial configuration and ecological processes of the remnant habitat fragments. These ecological changes impact plant and animal species, leading to population …
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Occurrence of ixodes scapularis and borrelia burgdorferi in the fragmented landscapes of east-central and northeast Illinois
… and B. burgdorferi establishment in a dynamic fragmented landscape. This study reveals mechanisms associated with wildlife – vector – pathogen interactions that could influence disease emergence and exposure, and it emphasizes the need to increase research efforts and public awareness …
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Applying the principles of spatial modelling to the management of biodiversity in the fragmented landscapes of south-western Australia
… by the impacts of a changing climate on fragmented landscapes. To mitigate these threats, conservation managers require models which can demonstrate the consequences of both negative impacts and management actions. This need can be addressed through spatial modelling applications. …
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Spatial models of plant diversity and plant functional traits : towards a better understanding of plant community dynamics in fragmented landscapes
… improved understanding of community dynamics in fragmented landscapes. In order to approach this overall aim, I identified key questions on the response of plant diversity and plant functional traits to variations in species' dispersal capability, habitat fragmentation and local environmental …
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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
… xeric mixed-grass prairies of various sizes in fragmented and non-fragmented landscapes of western South Dakota to determine what effects landscape fragmentation and grassland patch size have on avian (bird) communities. Avian species were surveyed within a randomly placed 150m x 120m …
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Landscape Characteristics Affecting Habitat Use and Productivity of Avifauna on Stock Ponds in Western South Dakota
… were assessed in 105 stock ponds located in fragmented and unfragmented landscapes in 52 10mi2 cells in 2000 using a standard protocol for surveying waterfowl. Seasonal and temporary wetlands were more abundant in fragmented landscapes. Wetlands in fragmented landscapes had more emergent …
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Demographic and genetic variability in Cape Dwarf Chameleons, Bradypodion pumilum, withink a fragmented, urban habitat
… and genetic variability for species inhabiting fragmented landscapes. Findings from such work enable effective conservation management, maximizing viability for potentially imperiled populations. Previous research has relied predominately on spatial analysis when investigating population …
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Habitat use, population size, and nesting ecology of conservation priority bird species using restored fields in agricultural landscapes
… scale conservation goals for birds in Midwestern landscapes. Although we know these programs provide large-scale conservation benefits, we do not understand the magnitude of this contribution. Beyond habitat use and population goals, conservation efforts to attract birds are only effective if …
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Effects of forest fragmentation on the demography of ovenbirds (Seiurus aurocapillus) in the boreal forest
… ovenbirds (Seiurus aurocapillus) was compared in landscapes highly fragmented by agriculture, moderately fragmented by commercial harvesting, and in contiguous boreal forest of Saskatchewan. Various survey techniques demonstrated that ovenbirds were less common in small, isolated forest patches in …
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Predicting the Repercussions of Anthropogenic Landscape Modifications on the Biota Using Species Focused Adaptable GIS and Spatial Dynamic Models
… population variations and patterns of spread in fragmented landscapes and (2) identify and address potential environmental risks associated with land-use planning. The approach consisted in the development of computer-based spatial dynamic models and GIS methods to (1) identify, for an habitat …
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The influence of woodlot size and location in suburban and rural matrices on bird species richness and individual abundance
… the habitat structure of smaller woodlots in fragmented landscapes to increase access to foraging habitat. Conservation strategies that reduce fragmentation and promote greater habitat diversity may lead to greater bird species diversity and abundance.</p>
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Modelling environmental changes in the Udzungwa Mountains of Tanzania through impact assessment on rainforest mammals
… challenging for species living in patchy and fragmented landscapes, as is the case for most mammals in tropical forests. This thesis addressed these issues by developing and validating analytical frameworks that allow to make robust spatial inference on population abundance, and ultimately …
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The Role of Resource Predictability in the Metapopulation Dynamics of Insects
… to understand the dynamics of species living in fragmented landscapes. In this dissertation, I investigate the unpredictable nature of resource availability for species living in human-dominated heterogeneous and dynamic landscapes in the context of its consequences for long-term regional …
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Landscape Genetics of the Marbled Salamander (Ambystoma Opacum) at Mammoth Cave National Park
… can be compared with patterns observed in more fragmented landscapes. These comparisons can provide a means of investigating the separate effects of structural and functional habitat connectivity on amphibian genetic population structure. Structural connectivity refers to the pattern of …
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Mammal diversity in the North Chickamauga Creek Gorge State Natural Area and the effects of internal fragmentation on the relative distributions of mammalian carnivores
Mammal Diversity Mammal species were surveyed in the North Chickamauga Creek Gorge State Natural Area using various methods of observation. Sixteen mammal species were detected in the natural area, 14 of which were previously undocumented. The whitefooted mouse and the raccoon were the most …
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The investigation of edge effects within ragmented forest islands in Short Hills Provincial Park
… that elevated areas of edge habitat occur within fragmented landscapes. Spatial and temporal edge effects were investigated in four areas designated as Nature Reserve Zones within Short Hills Provincial Park, near St. Catharines, Ontario. Random sampling along exposed edges was performed on trees …
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The impact of edge-effects on aerial insectivorous bat assemblages in the Amazon
… a species’ distribution in human-modified landscapes. Bats are the second most diverse mammalian order, however many species are not targeted in studies on edge-effects, particularly in tropical forests which suffer the highest rates of deforestation. This study aims to quantify the …
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Effects of morphology, habitat and weather on the movement behaviour of range-expanding butterfly species
… to respond to climate change, particularly in fragmented landscapes, where individuals often need to move longer distances to colonise new areas. It is therefore crucial to understand species’ movement behaviour and how it is affected by environmental variables to plan effective conservation …
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