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 12 of 12 for “"Bioclimatic variables"”.
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Methodological advancements for improving performance and generating ensemble ecological niche models
… test addressing this issue, we used Maxent, bioclimatic variables, and occurrence localities of a broadly distributed Malagasy tenrec, Microgale cowani (Family Tenrecidae: Subfamily Oryzorictinae). We modeled the abiotically suitable area of this species using three distinct datasets: …
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Revised distributional estimates for the recently discovered olinguito (Bassaricyon neblina), using museum and science records
… and citizen science-derived photo-vouchers) and bioclimatic variables. Optimal models were selected via two different approaches, AICc and performance on withheld data. The occurrence data used here show climatic signals different from those for data used in the original description of the …
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Physiological tolerances of high temperatures in Fynbos birds: implications for climate change
… of the most common responses to climate warming. Bioclimatic envelope modelling provides a useful method for predicting a species, future distribution under a given climate change scenario. However, these models require verification with empirical evidence, including physiological information. …
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Outside the Coffee Belt: A Study on the Suitability and Sustainability of Coffee Plants in California Due to Climate Change Using GIS
… of worldwide climate data that represent 19 bioclimatic variables were utilized in this study. WorldClim is an online repository containing historical, monthly meteorological data averaged across 30 years (1970–2000) and climate data representing possible future conditions based on various …
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"MODEL COMPLEXITY AND VARIABLE SELECTION IN MAXENT NICHE MODELS: ANALYSES FOR RODENTS IN MADAGASCAR"
… Eliurus majori (subfamily Nesomyinae), using 19 bioclimatic variables. Candidate models were created across a wide range of complexities. For both datasets, both model-selection techniques chose simpler models than Maxent’s default settings. In the unfiltered dataset, the models selected as …
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The effect of the study region on GIS models of species geographic distributions and estimates of niche evolution; preliminary tests with montane rodents (genus Nephelomys) in Venezuela
… occurrence records from the literature, and 19 bioclimatic variables. First, I modeled each species in a large study region that included the ranges of both species (Method 1; typically employed in most studies to date). Second, I modeled each species in a smaller study region surrounding its …
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Potential impacts of climate change on myosorex as a model for extinction risk of montane small mammals in South Africa
… investigated the potential impacts of climatic variables (temperature and rainfall) on the distribution of M. cafer, M. varius, M. sc/ateri, M. longicaudatus, southern and northern lineages of M. varius, and Myosorex cf. tenuis from Limpopo Province in space and time. The study also investigated …
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Habitat Ecology, Trophic Interactions, and Distribution of Endangered Himalayan Musk Deer in the Nepal Himalaya
… latitude and longitude) of the species and bioclimatic variables as inputs was employed. Annual mean temperature was found as the significant climatic variable affecting habitat selection at the scale of geographic range and the model predicted an expansion of climatically-suitable area at …
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Facilitating golden mole conservation in South African highland grasslands : a predictive modelling approach
… 38 specimens, based on interpolated data for 19 bioclimatic variables, continuous altitude data, as well as categorical spatial data for landtypes, WWF ecoregions and vegetation types. These initial models helped to effectively focus survey efforts within a vast study area, with surveying during …
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Identifying drivers of Cape vulture (Gyps coprotheres) space use in southern Africa
… The ecological niche models indicated that bioclimatic variables such as precipitation seasonality were the key factors that influenced the space use of the tracked vultures. The models predicted that climate change could potentially result in significant pole-wards shifts of up to 333 km in …
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The spatial ecology and conservation of an important game bird in Ireland: the Eurasian woodcock
… of 27,434 males (95% CL: 16,947 - 36,288). Bioclimatic variables, including precipitation and temperature seasonality and mean winter temperature, were important determinants of woodcock distribution, whilst forest habitat availability and composition at different landscape scales …
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Modelação e visualização da biodiversidade de briófitos em sistemas altitudinais na ilha do Pico - Açores
Com as crescentes alterações climáticas e a necessidade de conservação da biodiversidade, torna-se cada vez mais importante desenvolver ferramentas de modelação que permitam prever a distribuição potencial de espécies e apoiar estratégias de conservação eficazes. Neste âmbito, os modelos de …