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 34 for “"niche models"”.
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Ecological niche models of early rice agriculture in prehistoric Japan
… 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 proxies, …
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Methodological advancements for improving performance and generating ensemble ecological niche models
… 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, bioclimatic …
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Determining the Influence of Abiotic and Biotic Predictors on Ecological Niche Models
… 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 those that …
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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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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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Integrating ecophysiology, complex life histories, and niche models to forecast the impact of climate change: a mechanistic assessment of the vulnerability of European common frogs (ran temporaria)
El clima de la Tierra está cambiando a tasas sin precedentes, amenazando la biodiversidad. En este contexto, es de vital importancia evaluar la vulnerabilidad de especies y poblaciones, lo que depende de su exposición al cambio, su sensibilidad intrínseca (estrechamente relacionado con la …
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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
… 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 Macrolophus …
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Patterns of Taxonomic, Functional, and Phylogenetic Diversity, and Ecological Drivers of Stream Fish Assemblages in East Texas
… Additionally, I created two ecological niche models for a Species of Greatest Conservation Need (SGCN), Spotted Sucker <em>Minytrema melanops</em>, to compare model accuracy and inform conservation efforts of the species in these basins. The results of this study revealed that …
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Revised distributional estimates for the recently discovered olinguito (Bassaricyon neblina), using museum and science 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 data. The …
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Phylogenetic Niche Modeling
Projecting environmental niche models through time is a common goal when studying species response to climatic change. Species distribution models (SDMs) are commonly used to estimate a species' niche from observed patterns of occurrence and environmental predictors. However, a species niche is …
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High-Resolution Mapping of Fish Conservation Priorities within the Mobile River Basin
… of species. I developed environmental niche models (hereafter “ENMs”) using the Maximum Entropy algorithm <em>(MaxEnt)</em> and spatial conservation prioritization algorithm (<em>Marxan</em>) to map the fish presence maps of 176 species over 66,509 reaches using open-source species …
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Phylogenetics, biogeography, and climate niche variation of South Pacific and Hawaiian Psychotria
… 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
… 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 understand the …
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Divergence or Convergence of Home and School Ethnic-Racial Socialization: Effects on Preschool Children's Self-Regulation
… within the bioecological and developmental niche models, critical race theory, and frameworks that focus on the socialization of children from diverse ethnic-racial backgrounds, the current study examined differences between parents’ and teachers’ use of ethnic-racial socialization and links …
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A mechanistic framework for understanding prairie stream fish distributions
… change. Developing species distribution models is limited by an incomplete understanding of functional traits, spatial scaling, and the mechanisms and generalities of correlations among abundance and environmental gradients. I address these four issues using observational and experimental …
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The Use of Geographic Information Systems and Ecological Niche Modeling to Map Transmission Risk for Visceral Leishmaniasis in Bahia, Brazil
… 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 collection, …
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ECOLOGICAL NICHE MODELING AS A PREDICTIVE TOOL: ASIATIC FRESHWATER FISHES IN NORTH AMERICA
… 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 carp, …
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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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