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.
Results
Showing 1 to 20 of 85 for “"species distribution models"”.
-
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 …
-
Assessing predictive performance and transferability of species distribution models for freshwater fish in the United States
Rigorous modeling of the spatial species distributions is critical in biogeography, conservation, resource management, and assessment of climate change. The goal of chapter 2 of this dissertation was to evaluate the potential of using historical samples to develop high-resolution species …
-
A “Neighborhood” Approach for Using Remotely Sensed Data to Post-Process Species Distribution Models for Conservation Assessments
<p>Species distribution models can be used to predict environmental suitability, estimate changes in species’ geographic ranges, and support conservation assessments. Masking suitability maps built from these models to remove areas currently lacking appropriate vegetation can refine predictions and …
-
Extending the climate envelope: Methodological approaches to integrate ecological prerequisites in species distribution models at large spatial extents
Die vorliegende Arbeit stellt die potenziellen Auswirkungen des Klimawandels auf die Verbreitung von geschützten Tierarten dar. Dabei werden verschiedene Einflussfaktoren, hier Unsicherheiten in der Datengrundlage, Ausbreitungsdistanzen und biotische Interaktionen, sowie deren Einfluss auf die …
-
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 …
-
Predicting the distribution and impacts of non-native birds in the Iberian Peninsula
Increasing numbers of species are being transported beyond their natural range boundaries by humans. These non-native species can have severe negative impacts on native biodiversity. In order to guide management of these species it is important to be able predict where non-native species will …
-
Regional data refine local abundance models: modeling plant species abundance distributions on the Central Plains
Species distribution models are frequently used to predict species occurrences in novel conditions, yet few studies have examined the effects of extrapolating locally collected data to regional scale landscapes. Using boosted regression trees, I examined the issues of spatial scale and errors …
-
Science, Community, and Culture: A Holistic Approach to Ecological Research and Education
… historically been used to identify drivers of species declines, but such studies are often resource-intensive, resulting in significant spatial and temporal data gaps when researchers lack the resources necessary to maintain such studies. One promising solution for overcoming gaps in …
-
Incorporating microclimate into habitat suitability analysis for plethodonitd salamanders
Climate has substantial influence on the distribution of species, and climate change puts many species at risk of extirpation or extinction due to diminishing range sizes. Understanding how organisms may respond to climate change is important for spatially predicting suitable habitat for …
-
The use of right of ways by primary burrowing crayfishes in the Ouachita Mountains Ecoregion of Arkansas
… two narrowly endemic primary burrowing crayfish species, Fallicambarus harpi and Procambarus reimeri. To investigate this interaction, I collected habitat data, locality information, and tested computer generated habitat models for these two species in the Ouachita Mountains Ecoregion (OME) of …
-
Modeling the spatial and temporal dynamics of coastal marsh birds
… an emphasis on the king rail (Rallus elegans), a species of high conservation concern. My objectives were to investigate the wetland bird-environment relationship across scales, and to model annual changes in bird distribution. Study sites were in the fresh and intermediate (oligohaline) marshes …
-
Potential Effects of Climate Change on the Distribution and Migration of European Breeding Migratory Birds
… simulated changes in breeding and non-breeding distribution. Methods: Generalised Additive Models were used to determine those climatic variables that produced the most robust species distribution models. Tests on the performance of three regression-based techniques were undertaken and consensus …
-
Ensemble models to assess the risk of exotic plant pathogens in a changing climate
In recent decades, species distribution models (SDMs) have been widely used in many ecological, environmental and climate-change research studies to model invasive species establishment. These models associate recorded locations of species with environmental variables. Nevertheless, the few studies …
-
The vascular flora and species distribution modeling of two rare species in Cloudland Canyon State Park, Dade and Walker Counties, Georgia
… records resulting in the documentation of 665 species and subspecific taxa, representing 361 genera in 122 families. The top three most represented families were Asteraceae (99 taxa; 14.9%), Poaceae (64; 9.6%), and Cyperaceae (52; 7.8%). Twenty-eight rare species were documented, including 10 …
-
Biodiversity of urban brownfields: modelling species occurrence and persistence in dynamic habitats
… for a diverse flora and fauna, including rare species. The continuous changes in brownfield location (due to redevelopment and abandonment) and in their habitat conditions (due to succession) generate a spatio-temporal mosaic cycle of transient habitats. Aim of this study was to evaluate the …
-
Using digitized herbarium specimens to predict potential distributions of Tennessee's historical angiosperm species
Species distribution models (SDMs) have become an essential tool in focusing conservation efforts for species with incomplete distribution records. SDMs enable conservation managers to increase field survey efficiency by prioritizing areas to invest time and financial resources. This application is …
-
Tracking thicket through space and time : insights into the evolutionary history of the Albany Subtropical Thicket from comparative phylogeography and distribution modelling
Albany Subtropical Thicket (AST) is a species-rich biome restricted to the coastal lowlands of the southern Cape region of South Africa. Its Quaternary history is poorly understood, but climatic changes associated with Pleistocene glacial cycles may have profoundly affected the distributions, gene …
Page 1 of 5