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 25 for “"Ecological niche modeling"”.
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ECOLOGICAL NICHE MODELING AS A PREDICTIVE TOOL: ASIATIC FRESHWATER FISHES IN NORTH AMERICA
… or at least contain them. This dissertation uses ecological niches modeling to estimate the ecological requirements of 33 Asiatic freshwater fishes from native-range occurrence points, and to use these data to forecast their invasive potential in North America. The silver carp, bighead carp, grass …
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The Use of Geographic Information Systems and Ecological Niche Modeling to Map Transmission Risk for Visceral Leishmaniasis in Bahia, Brazil
… to develop and evaluate the applicability of ecological niche models (ENM) for leishmaniasis, to determine the influence of environmental and socioeconomic factors on the incidence of these diseases at three geographic scales: national, statewide and community. Water availability, garbage …
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Modeling species geographic distributions in aquatic ecosystems using a density-based clustering algorithm
… effective control and prevention. Furthermore, ecological niche modeling experiments are generally developed and tested using data from terrestrial organisms, neglecting aquatic organisms in case studies. Both disease and aquatic systems are often data limited, and current modeling methods are …
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Phylogeography of eastern leatherwood (Dirca palustris L.) resolved by chloroplast sequencing and microsatellite genotyping
… observations of seed dispersal. I used ecological niche modeling, chloroplast sequencing, microsatellite genotyping, and phenotypic investigations to answer questions about the historical and contemporary distribution of populations and genes of D. palustris across the landscape of …
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Randomness In Tree Ensemble Methods
… to be a popular and powerful tool for predictive modeling tasks. The theory behind several of these methods (e.g. boosting) has received considerable attention. However, other tree ensemble techniques (e.g. bagging, random forests) have attracted limited theoretical treatment. Specifically, it has …
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Randomness In Tree Ensemble Methods
… to be a popular and powerful tool for predictive modeling tasks. The theory behind several of these methods (e.g. boosting) has received considerable attention. However, other tree ensemble techniques (e.g. bagging, random forests) have attracted limited theoretical treatment. Specifically, it has …
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Factors Shaping Macrofaunal Polychaete Communities in the Gulf of Mexico
… of polychaetes in the GoM. We performed an ecological niche modeling analysis (ENM) based on ?presence-only? data of four cosmopolitan species belonging to the Cirratulidae and Spionidae in the GoM. The GoM, being a semi-enclosed ocean basin, offers complex topographic features and …
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AI-Driven Suitability Modeling for Sustainable Olive Cultivation: An Environmental Assessment in a Changing Climate
… the olive tree has high economic, cultural, and ecological value; however, it is highly sensitive to climate change. Rising temperatures and declining rainfall in drier and semi-drier regions, such as the northern part of Saudi Arabia, are threatening olive cultivation. Al-Jouf is considered a …
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Historical refuges and recolonization routes in the Southern Appalachian Mountains, inferred through phylogeographic analysis of the spotted wintergreen (Chimaphila maculata)
… benefited from incorporation of coalescent modeling to test competing scenarios of population history of a species. Ecological niche modeling has also been useful in inferring areas of likely suitable habitat during past climate conditions. Several studies have examined the population …
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Phylogenetics, biogeography, and climate niche variation of South Pacific and Hawaiian Psychotria
… confined to a narrow distribution? Species age, ecological niche, or dispersal traits may help explain why some insular species are abundant and found on many islands, while others are rare and restricted to one island. In this study, I inferred a robust, time-calibrated phylogeny of the Hawaiian …
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Temporal Change in Community Composition, Ecological Niche, and Phenotypic Selection in Minnesota’s Rare Arctic Relict Plants
… an overall mean decrease in species richness. Ecological niche modeling based on Minnesota populations of Primula mistassinica, Pinguicula vulgaris, and Euphrasia hudsoniana show a high probability of drastic reduction in suitable habitat under a conservative climate model forecast. To …
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Exploring Patterns of Genetic Diversity of a Malagasy Ant Species: Anochetus Madagascarensis
… Riverine and Watershed hypotheses and employed ecological niche modeling to test for evidence of ecologically driven speciation. Four genetic clusters were recovered using GENELAND; one found on Mayotte of the Comoros Islands, one restricted to the eastern coast of Madagascar, one on the …
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Investigating the Valley Fever – Environment Relationship in the Western U.S.
… environmental variables and valley fever by modeling the spatial and temporal dynamics of the disease using varying techniques. Chapter 1 discusses relevant literature before discussing the challenges associated with studying valley fever. Chapter 2 analyzes the temporal relationships between …
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Mapping and modeling of neglected tropical diseases in Brazil and Bolivia
… remote sensing technologies within the MaxEnt ecological niche modeling program to create predictive risk maps for leprosy and Schistosomiasis in Brazil and Chagas disease in both Brazil and Bolivia. New disease cases were compiled for leprosy, Schistosomiasis, and Chagas disease from the …
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Climate, environment, and competition influenced human land preference in late pleistocene Australasia
Ecological niche models (ENM) have long been used in the biological sciences to predict species distributions and dispersal patterns, but this method remains relatively new to paleoanthropological reconstructions of hominin niches. Hindcasted predictions of hominin niche space in Europe and Central …
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Evolutionary dynamics of bird populations in Southeast Asia
… investigations of the historic, geographic and ecological factors that shaped the morphological and genetic diversity of rainforest birds in Southeast Asia. (1) In the Oriental Dwarf Kingfisher (Ceyx erithaca) complex, the birds are highly polymorphic in plumage. Quantitative analysis of this …
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Geographic patterns of speciation in West and Central Africa: The role of rivers, mountains, and refugia
… population genomic, demographic and niche modeling analyses to gain a better understanding of the responses of West and Central African taxa to the major climatic and geographic events shaping African rainforest biota. Chapter 1 examines the role that the Pleistocene glaciation cycles …
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Cross-scale assessment of environmental variation on RABV reservoir Desmodus rotundus
… Human activity has been shown to impact multiple ecological components, with changes to disease dynamics caused by human activity being linked to disease emergence and pandemic risk. In Latin America, the rabies virus (RABV) is regularly transmitted by the common vampire bat (Desmodus rotundus). …
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