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 125 for “"ecological niche"”.
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Unearthing an educator's ecological niche: A heuristic inquiry
<p>The purpose of this study is to better understand how the natural environment influences who we have become as adults. Recognizing the importance of childhood experiences, with and within nature, the intent of this study is to interpret the essential meanings associated with these experiences …
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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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Ecological niche responses of small mammals to gypsy moth disturbance
The objective of this study was to determine differences in small mammal assemblage structure and population dynamics among four oak dominated sites at four different stages of gypsy moth disturbance: a high tree mortality site, a disturbance in process site, a disturbance recovery site, and an …
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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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The application of ecological niche to create multi-strain microbial biocontrols
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-04-06 without embargo terms
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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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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 Ecological Niche of Darters (Pisces:Percidae) Across Multiple Scales in the Ohio River Basin
The ecological niche is a theoretical construction used to understand the factors that drive species distributions. Niche theory allows ecologists to visualize and discuss patterns relating organisms to surrounding environmental and biotic constraints, and henceforth quantify processes leading to …
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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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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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A common and previously unknown ecological niche: the halorespiration of natural organochlorines in terrestrial soil and sediment
The phylum <italic>Chloroflexi</italic> contains several isolated bacteria that have been found to dechlorinate a diverse array of halogenated anthropogenic chemicals. These bacteria use organohalogens, such as polychlorinated biphenyls and trichloroethene, as their terminal electron acceptors and …
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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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Ecological niche partitioning and resource utilization in two sympatric lacertid lizard species (Meroles anchietae and M. cuneirostris) from the Namib Desert
… one habitat requires divergence into one or more niche dimensions (i.e., spatial, temporal and trophic) to reduce competition. Coupled with a scarcity of resources, the Namib Desert is an arid ecosystem with a high lizard diversity and presents an ideal ecosystem to investigate niche partitioning …
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Reconstructing the ecological relationships of the latest Cretaceous Antarctic dinosaurs and how functional tooth morphology influenced diet and ecological niche among basal Ornithopod dinosaurs
… with one another. This allows us to construct an ecological model of this local fauna, a first for Antarctica in this time period. This study is important in characterizing not only local ecological relationships, but will also provide an in-depth analysis of functional tooth morphology that has …
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The Ape Ecological Niche: Posture and Hand Use in Gibbons and Macaques and the Influence of Manual Skill on Cognitive Development in Apes and Humans
Apes share a distinct set of morphological and anatomical characteristics that allow us to use our arms and hands in unique ways. Apes also have relatively larger brains with similar sulcal patterning indicating there is a distinctively hominoid brain structure. These features in great apes have …
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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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