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 14 of 14 for “"Niche theory."”.
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Investigating Reproductive Phenology and Alloparental Care in Leuciscid Fishes using Niche Theory Approaches
… I applied both Eltonian and Hutchinsonian niche approaches to the reproductive mutualism of leuciscids known as nest association, a form of alloparental care characterized by an adult of one species guarding the offspring of another. I conducted this study with the leuciscid community of …
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Predictive Analysis of Arizona Dust Storms (1996–2023): GIS, Artificial Intelligence (MaxEnt), and Spatiotemporal Data
… that tackle real-world problems. Ecological Niche Theory (Hutchinsonian Niche Theory) was used as the theoretical basis for this research, as the concept of ‘niche’ as a set of environmental factors under which a species can exist can also apply to dust storms. The analysis utilizes …
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Are People Reading Local News? A Content Analysis of Popular News Stories on Nine Newspaper Websites
… in their behaviors. This study is guided by niche theory, and the results show the theories at work as readers of these sites overwhelmingly gravitated towards two niche categories: local news and sports, and disregard the other offerings on the websites.</p>
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Migrants access to the labour market and ethnic niching: case study of Zimbabweans employed in the Cape Town restaurant industry
… concentrated in specific industries. The ethnic niche theory, the segmented labour theory and social network theories were taken as the point of departure. These theories were further broken down into four key factors that were believed to be integral to understanding how migrants gain entry and …
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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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Resource partitioning of soil organic phosphorus: investigations from a tropical mountain forest
One of the major limitations of resource-niche theory to explain plant species diversity and distribution is the paucity of recognized resources. Recent investigations in grassland and tundra ecosystems indicate that plant species can specialize to exploit different forms of soil nitrogen. I …
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Historical and Geographic Context for the Evolution of Climate Niche Breadth in Temperate Plants
… traits, fitness, environments and distributions. Niche theory provides a useful framework. Niche breadth describes the range of environmental conditions necessary for population growth. Among these conditions, climate is especially important. Climate niche breadth in turn may reflect a confluence …
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Ecological Niches, Species Distributions, And Biogeographic Processes In Rodents On Neotropical Sky Islands
… 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 America …
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Modelling spatio-temporal changes in the ecological niches of major domesticated crops in China: Application of Species Distribution Modelling
… of crops in the past related to their ecological niches. In particular, it presents the niche models for five historically significant crops in China: rice, millet, wheat, barley and buckwheat. These models are rooted in the Species Distribution Modelling (SDM) methodology and infer the potential …
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Ecological insight into three neotropical deer species: A study of spatial and diel distributions of white-tailed, Central American red brocket, and Yucatan brown brocket deer in northern Belize, Central America
Niche theory predicts that ecologically similar species sharing space and resources must differ along at least one niche axis to coexist, with space, time, and diet as the three primary axes. Despite their ecological and cultural significance in Central America, no peer-reviewed study has examined …
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Developing a Framework for Urban DNA Analysis
… on the interplay of regulatory mechanisms and niche dynamics that shape a city's identity, growth, and long-term development. This research aims to theorize and operationalize the concept of urban DNA in a way that captures both structural and place-based drivers of urban transformation. To do …
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On the ecological transitions between parasitism and mutualism
… preferred locations. This finding reveals that niche partitioning can occur within macroscopic symbiotic communities even when they coexist upon the same host animal. Next, I investigate whether P. carabi mites and N. vespilloides are ever (by-product) mutualists. I assess whether mites assist …
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Phase transitions in fluids and biological systems
… the transition between neutral (random) and niche (deterministic) assembly. I apply this metric to 16S rRNA metagenomic studies of 6 vertebrate gastrointestinal microbiomes and find that they assembled through a highly non-neutral process. I then consider a phase transition that may occur in …
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Congregational growth, closure, identity, and diversity.
Despite stories of secularization in America, congregations still possess power as one of America's most prolific social organizations. Their power can be seen by the fact that congregations receive the highest proportion of philanthropic donations of any social institution (Hoge, Zech, McNamara, …