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 303 for “"species distribution"”.
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Exploring Fisheries Species Distribution Shifts in Response to Freshwater Inflow Through the Bonnet Carré Spillway Using Species Distribution Models
… the impact of the BCS on nektonic fisheries species. Here, a series of seasonal Maximum Entropy (MaxEnt) species distribution models are constructed, validated, and performance-assessed to explore how BCS openings might affect <em>Brevoortia patronus</em>, <em>Cynoscion nebulosus</em>, and …
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Species distribution modelling of Aloidendron dichotomum (quiver tree)
A variety of species distribution models (SDMs) were fit to data collected by a 15,000km road-side visual survey of Aloidendron dichotomum populations in the Northern Cape region of South Africa, and Namibia. We fit traditional presence/absence SDMs as well as SDMs on how proportions are …
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Species Distribution Modeling for Arid Adapted Habitat Specialists in Zion National Park
… The machine learning method, MaxEnt, constructed species distribution models (SDMs) in ZION for the two study species at 30 m and 900 m spatial resolutions using climate, topographic, and remotely sensed data. Additionally, 900 m forecasting models were constructed to observe the shifts in …
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Spatial regression methods capture prediction uncertainty in species distribution model projections through time
<p>Species distribution models (SDMs) relate observed locations of a species to climate, and are used for projecting the fate of a species under climate change scenarios. To be useful in a decision-making context, the uncertainty associated with these projections must be known. However, the …
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Spatial regression methods capture prediction uncertainty in species distribution model projections through time
<p>Species distribution models (SDMs) relate observed locations of a species to climate, and are used for projecting the fate of a species under climate change scenarios. To be useful in a decision-making context, the uncertainty associated with these projections must be known. However, the …
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Spatial Pattern Analysis of Tree Species Distribution in a Central Appalachian Upland Heath Barren
… characterized the spatial pattern of three tree species distributions in the upland heath barrens on Cabin Mountain in Canaan Valley, West Virginia through fieldwork, statistical modeling, and the use of geographical information systems (GIS). The research objectives were to: 1) quantify the …
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Influence of elevation on tree species distribution and growth in the southern Appalachian Mountains
… an area of interest for the analysis of forest species growth and composition. Past forest vegetation studies focus on species composition and structure for relatively local scale research areas. Species distribution within this geographic area was compiled from studies published from 1956 to …
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A reevalution of Tennessee’s invasive plant species using SERNEC and Maximum Entropy species distribution models
The detection and monitoring of invasive plant species present tremendous challenges to land managers. To reduce the economic and environmental costs associated with developing management plans for invasive plants, organizations such as the National Invasive Plant Council work to rank invasive …
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Incorporating plant community structure in species distribution modelling: a species co-occurrence based composite approach
Species distribution models (SDM) with remotely sensed (RS) imagery is widely used in ecological studies and conservation planning, and the performance is frequently limited by factors including small plant size, small numbers of observations, and scattered distribution patterns. The focus of my …
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Incorporating plant community structure in species distribution modelling: a species co-occurrence based composite approach
Species distribution models (SDM) with remotely sensed (RS) imagery is widely used in ecological studies and conservation planning, and the performance is frequently limited by factors including small plant size, small numbers of observations, and scattered distribution patterns. The focus of my …
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Environmental granularity, rivers and climate history as shaping factors for species' distribution and diversity patterns
Species distributions are composed by those places in which the environmental conditions are suitable for the species to survive and maintain populations; where the interactions with other species are adequate; that have been accessible given species' dispersal capabilities. Biodiversity patterns …
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Species distribution, phylogenetic structure and functional roles of detritus inhabiting fungi across contrasting aquatic environments
… to: 1) link community function to individual species/isolates, 2) determine functionally redundancy at the class and isolate level, 3) determine the functional magnitude of individual isolates and 4) determine if function and functional magnitude are pH-dependent. Samples of fine submerged …
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Species Distribution and Richness Patterns of Bird Communities in the High Elevation Forests of Virginia
… theory predicts that the patterns and distributions of spatially isolated populations are governed by large scale processes. The high elevations forests in the Southern Appalachians represent a series of naturally fragmented islands that harbor many isolated populations of species at …
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Prioritization of conservation areas using species distribution modeling based on current data of butterflies in Johor
Rapid disappearance of habitats and species justifies the need to study species range and distributions so that high-priority conservation areas can be identified. Species distribution modeling (SDM) is an approach that can overcome the time and budget constraints of protected area management. This …
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E pluribus unum: what individual whales can tell us about enigmatic species distribution and social organization
Large whales have historically been difficult to study and many aspects of their ecology remain unknown especially at the long -term population level. The ability to identify individual whales based on natural markings provides the opportunity to track individuals over time and space; this data may …
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