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 29 for “"species 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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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
… and buckwheat. 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 …
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Modelling the spatial distribution of blackbird (Turdus merula) and ring ouzel (Turdus torquatus) in Switzerland
… blackbird (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 …
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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.
The potential impacts of climate change on many species worldwide remains unknown, especially in those tropical regions that are centers of endemism and are highly biodiverse. This thesis provides an insight into the extinction risk of selected tree species using different species distribution …
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The effects of paleoclimate on the distributions of some North West African Lizards.
… concern over the effects 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 …
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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
… ecosystem 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 …
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The Spatial and Molecular Epidemiology of Lyme Disease in Eastern Ontario
… Lyme 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.
… were studied based on the presence 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 …
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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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Climatic specialisation: an explanation for the range size and distribution of bryophytes on a tropical island elevational gradient
Are species physiologically specialised to the specific climatic conditions 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 …
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Tulipa: the taxonomy and evolutionary history of the genus and its impact on conservation priorities in Central Asia
… synonymization and reinstatement of a number of species. We also reorganised the higher-level taxonomic groups of this genus recognising a new subgenus, Eduardoregelia, and simplifying the sections of this genus, primarily merging Tulipa, Tulipanum, Lanatae, Vinistriatae, and Spiranthera into one …
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Spatial ecology informs reintroduction tactics for warabin (Burhinus grallarius;bush stone-curlew)
… conservation intervention used to restore species and their ecological functions within their former range. Reintroduction success relies on the appropriate selection of tactics and strategies tailored to the species and recipient ecosystem; however, sufficient ecological knowledge is not …
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Spatial ecology informs reintroduction tactics for warabin (Burhinus grallarius;bush stone-curlew)
… conservation intervention used to restore species and their ecological functions within their former range. Reintroduction success relies on the appropriate selection of tactics and strategies tailored to the species and recipient ecosystem; however, sufficient ecological knowledge is not …
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The potential impact of climate change on the genetic diversity of the endangered western leopard toad, Sclerophrys pantherina
… on the potential for climatic shifts to alter species' ranges, phenology, physiology, and behaviour, addressing higher level units of biodiversity from populations to biomes. However, the potential effects of climate change on the most fundamental unit of biodiversity, intraspecific genetic …
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Adaptive robotic search and sampling of sparse natural phenomena
… the environment with hierarchical probabilistic modelling which maps substrate distributions to the underlying phenomena of interest. By using substrates that are detectable over a wide field of view, and correlated with sparser and harder to find phenomena, a robot can be guided to regions known …
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Developing and assessing methods to census and monitor burrow-nesting seabirds in Ireland
… the remote nature of breeding colonies of many species make them difficult to study. Burrow-nesting species are the most difficult of all seabird groups to census due to their cryptic breeding habits, nocturnal behaviours within breeding colonies, and coexistence with other burrowing species. …
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