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 21 for “"ecological niche models"”.
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Ecological niche models of early rice agriculture in prehistoric Japan
… millennium BCE. This involved reconstructing the ecological niche for rice during this period by using a mechanistic process-driven approach based on physiological assumptions on rice agriculture requirements and a correlative, data-driven, approach based on observed presence data of different …
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Methodological advancements for improving performance and generating ensemble ecological niche models
… aim of reducing overfitting to sampling bias in ecological niche models (ENMs). Sampling bias in geographic space leads to localities that may also be biased in environmental space. If so, the model can overfit to those biases. As a preliminary test addressing this issue, we used Maxent, …
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Determining the Influence of Abiotic and Biotic Predictors on Ecological Niche Models
… distributions and are typically excluded from ecological niche models (ENMs). However, the role such interactions play in shaping species distributions is increasingly recognized, sparking the development of methods for their integration into ENMs.</p> <p>Among the most common approaches are …
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Combining ecological niche models and dispersal simulations to predict bryophytes dynamic response to climate changes
… des informations spatiales afin d’inférer les niches écologiques d’espèces à partir des conditions climatiques actuelles. L’une des principales hypothèses de ces modèles est cependant que les espèces vivent en équilibre avec leur environnement, comme si elles n’avaient aucune limite de …
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Worldwide spatial distribution of Tuta absoluta (Lepidoptera: Gelechiidae) and its natural enemies under current and future climatic change conditions through modelling
… in many regions of the world. In this study, ecological niche models were built investigate the areas under risk of invasion of T. absoluta and the effect of climate change on it and four of its natural enemies (Neochrysocharis formosa, Stenomesius japonicus, Pseudapanteles dignus, and …
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Patterns of Taxonomic, Functional, and Phylogenetic Diversity, and Ecological Drivers of Stream Fish Assemblages in East Texas
… as excellent natural systems for examining the ecological processes shaping biodiversity patterns and species distributions. In 2023-2024, 60 streams in the Neches and Sabine River basins were surveyed across three seasons to investigate the patterns and ecological drivers of taxonomic (TDβ), …
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Revised distributional estimates for the recently discovered olinguito (Bassaricyon neblina), using museum and science records
… records and more current ENM methods. I build ecological niche models in Maxent using occurrence data (georeferenced museum records and citizen science-derived photo-vouchers) and bioclimatic variables. Optimal models were selected via two different approaches, AICc and performance on withheld …
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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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"MODEL COMPLEXITY AND VARIABLE SELECTION IN MAXENT NICHE MODELS: ANALYSES FOR RODENTS IN MADAGASCAR"
<p>Ecological niche models (ENMs) characterize the relationship between localities where a species is known to occur and the abiotic characteristics of these regions. While widely used, ENMs remain subject to several outstanding issues, including those related to model complexity and violation of …
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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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Faunal and human biogeography during the Terminal Pleistocene.
… 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- analogue communities of the Late …
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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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Ecological Niches, Species Distributions, And Biogeographic Processes In Rodents On Neotropical Sky Islands
… and theoretical improvement of correlative ecological niche models (ENMs) to better understand the processes governing species distributions and associated evolutionary divergence in rodents inhabiting mesic conditions in the Neotropics. Focusing on a widespread rodent from northern South …
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Patterns of Historical and Contemporary Distribution and Occurrence of Imperiled Fish Populations in East Texas Streams
… time periods. At the regional scale, I developed ecological niche models (Maxent) using occurrence data from 1940–1999 (historical) and 2000–present (contemporary, including surveys from 2023–2025) to evaluate changes in habitat and identify key regional environmental variables influencing species …
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Identifying drivers of Cape vulture (Gyps coprotheres) space use in southern Africa
… I present the first approximation of the spatial niche of Cape vultures using ecological niche modelling methods and provide a first assessment of the potential impacts of climate change on their future occurrence. Immature individuals and two of the reintroduced vultures traversed extensive …
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Habitat modification and gene flow in Saimiri oerstedii: Landscape genetics, intraspecific molecular systematics, and conservation
… population genetic methods and Bayesian models. I also compare population genetic structure among males versus females to test for sex-biased dispersal patterns in S. o. citrinellus. Then, using landscape genetic approaches, I describe the relationship between landscape heterogeneity and …
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Comparative Population Genomics and Speciation of Snakes Across the North American Deserts
… divergence in each taxon, assessing alternative models that included (a) strict isolation, (b) divergence with secondary contact, and (c) divergence with continuous gene flow. Results from this study suggest that all populations identified via clustering methods represent distinct species with …
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Reconstructing Past Population Dynamics and Movements from Genomic and Environmental Data
… reconstructions, to reconstruct the past using ecological models. This thesis aims to explore new computational methods to reconstruct the past of different species with various data availability, and to answer the ecological questions behind those. Ancient genomics has been a powerhouse for …
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