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 38 for “"distribution modelling"”.
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Species distribution modelling of Aloidendron dichotomum (quiver tree)
A variety of species distribution models (SDMs) were fit to data collected by a 15,000km road-side visual survey of Aloidendron dichotomum populations in the Northern Cape region of South Africa, and Namibia. We fit traditional presence/absence SDMs as well as SDMs on how proportions are …
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Spectral Energy Distribution Modelling of X-ray Selected AGNs and Their Host Galaxies
The nature of the relation between active galactic nuclei (AGN), and their host galaxies have been observed in detail throughout the Universe. Such work has found an intrinsic link between central supermassive black hole (SMBH) masses, and host galaxy properties such as the velocity dispersion of …
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Incorporating plant community structure in species distribution modelling: a species co-occurrence based composite approach
Species distribution models (SDM) with remotely sensed (RS) imagery is widely used in ecological studies and conservation planning, and the performance is frequently limited by factors including small plant size, small numbers of observations, and scattered distribution patterns. The focus of my …
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Incorporating plant community structure in species distribution modelling: a species co-occurrence based composite approach
Species distribution models (SDM) with remotely sensed (RS) imagery is widely used in ecological studies and conservation planning, and the performance is frequently limited by factors including small plant size, small numbers of observations, and scattered distribution patterns. The focus of my …
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Modelling spatio-temporal changes in the ecological niches of major domesticated crops in China: Application of Species Distribution Modelling
… These models are rooted in the Species Distribution Modelling (SDM) methodology and infer the potential areas suitable for the cultivation of each crop from the present distributional data. Model predictions are extrapolated on the palaeoclimatic reconstructions to obtain suitability …
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Tracking thicket through space and time : insights into the evolutionary history of the Albany Subtropical Thicket from comparative phylogeography and distribution modelling
… glacial cycles may have profoundly affected the distributions, gene flows, and demographies of species. The glacial refugia hypothesis predicts that AST retracted into fragmented refugia during glacial cycles. The evolutionarily discrete drainage basin (EDDB) hypothesis suggests that the …
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Distributional modelling in forestry and remote sensing
The use of distributional models in forestry is investigated, in terms of their capability of modelling distributions of forest mensurational attributes, for modelling and inventory purposes. Emphasis is put on: (i) the univariate and bivariate modelling of tree diameters and heights for …
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Modelling the spatial distribution of blackbird (Turdus merula) and ring ouzel (Turdus torquatus) in Switzerland
… (T. merula) in Switzerland, we adopt species distribution modelling and predict the species’ spatial distribution. We model on two different scales to analyse in how far downscaling leads to a different set of predictors to describe the realised habitat best. While the models on macroscale …
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Empirical approaches to the conservation of Margaritifera Margaritifera
… well as overexploitation. Analysis of recorded distribution data within the United Kingdom and Republic of Ireland showed that the Freshwater pearl mussel range contracted dramatically during the mid 20th century into core areas, however, not at an equal rate within each region. This species …
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Impact of climate change on extinction risk of montane tree species.
… of selected tree species using different species distribution modelling techniques and reviewing the current conservation status on montane forest in the Tropical Andes. Starting with a global analysis, the potential impacts of climate change on montane ecoregions is investigated, by identifying …
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The effects of paleoclimate on the distributions of some North West African Lizards.
… these changes have on a species habitat and distribution. Climate change is thought to have a major effect on the distribution of species, with the potential to cause isolated/fragmented populations, which could lead to genetic divergence. In this study species distribution modelling was …
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Modelling the current and potential distribution of woody plants, with special emphasis on the importance of spatial scale and environmental factors
The relationship between species distribution and environment has always been a central issue in ecology. The primary aim of this thesis is to explore the role of abiotic and biotic factors in mediating the distribution of woody plants, particularly invasive alien species. Predictions of the future …
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Valuing the ecosystem services provided by UK bats under climate change
… services they provide. By integrating species distribution modelling, functional trait analysis, molecular dietary data, trophic network reconstruction, and economic valuation, this thesis develops a cross-scale framework linking biodiversity change to ecosystem service delivery in agricultural …
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The Spatial and Molecular Epidemiology of Lyme Disease in Eastern Ontario
… disease in Canada. Using maximum entropy species distribution modelling to correlate blacklegged tick occurrence data with environmental variables, predictive risk models for I. scapularis and the Lyme disease pathogen, Borrelia burgdorferi, were developed. The model prediction was used to …
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Faunal and human biogeography during the Terminal Pleistocene.
… of mammal species throughout Europe. Species distribution modelling of current climatic niches provided a new quantifiable framework for defining the ecology of mammals in Europe today to enable the reconstruction of past environments. Based on this framework, this thesis investigated the non- …
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Facilitating golden mole conservation in South African highland grasslands : a predictive modelling approach
… little is known about the biology, taxonomy, distribution and severity of threats faced by many of these taxa. In an attempt to raise awareness of these elusive grassland flagship taxa, the Endangered Wildlife Trust's Threatened Grassland Species Programme (EWT-TGSP) identified the need for …
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Advancing Normalising Flows to Model Boltzmann Distributions
… manner according to the so-called Boltzmann distribution. Modelling and sampling from it is important for many applications, such as understanding biochemical processes and diseases, as well as discovering drugs. Traditional methods to sample from Boltzmann distributions are expensive. …
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Climatic specialisation: an explanation for the range size and distribution of bryophytes on a tropical island elevational gradient
… in their habitats and can this explain their distributions? This thesis addresses this question using a very specific system: bryophytes on the elevational gradient of Piton des Neiges, Réunion Island. Bryophytes are expected to be specialised to fairly narrow conditions of drought, …
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Quantitative measurement of spatial accessibility to locations both in urban and peri-urban environments
… analyses, which deal with service location modelling, are carried out using Flowmap software. The analyses include; proximity counts analysis, and catchment area analysis. Literature reviewed discusses the components of accessibility, indicators of accessibility, and GIS-based accessibility …
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Spatial ecology informs reintroduction tactics for warabin (Burhinus grallarius;bush stone-curlew)
… to develop a maximum entropy (maxent) species distribution model of warabin habitat use. Warabin habitats were partitioned into roosting habitat, characterised by cover (30-40% overstory, >5% understory and hill slopes), and foraging habitat, characterised by food-related features (live green …
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