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 40 for “"NMDS"”.
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Quantifying variation in teeth of Late Triassic vertebrates: implications for identification, palaeoecology, and biostratigraphy
… (3DGM) and non-metric multidimensional scaling (NMDS) to both examine variation and evaluate whether these techniques could be used to help identify isolated aetosaur teeth, particularly in microvertebrate deposits. I found that, broadly, aetosaurs can be distinguished from the outgroups tested. …
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Vegetative communities as indicators of ground beetle (Coleoptera: Carabidae) diversity
… July 2012. Nonmetric multidimensional scaling (NMDS) ordinated the land units by their carabid assemblages into five ecologically meaningful clusters: disturbed, marsh, prairie, restoration, and savanna. The subset of land unit characteristics with the highest rank correlation with the NMDS …
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Taxonomy, Diversity, and Distribution Patterns of Portunid Crab Megalopae in the Northern Gulf of Mexico During Fall of 2003
… maps and non-metric multi-dimensional scaling (NMDS) depicted geographic distributions and community structure during the study period. Mapping of NMDS coordinates illustrated distribution patterns for four community types of portunid megalopae as mainly distinguished by the differences in …
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THE ROLE OF SKELETAL MUSCLE-SYNTHESIZED BRAIN-DERIVED NEUROTROPHIC FACTOR IN RETROGRADE TRANSPORT ALONG MOTORNEURON AXONS
… skeletal muscle. Neuromuscular diseases (NMDs) are characterized by the degeneration of motorneurons and/or associated skeletal muscles, and reduced BDNF is implicated in NMDs. Using Cre-Lox gene recombination technology our lab generated transgenic mice in which the BDNF gene was knocked …
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The Short Term Responses of Benthic Macroinvertebrates to the Removal of Riparian Rhododendron in Southern Appalachian Streams
… Using Nonmetric Multidimensional Scaling (NMDS) and permutational MANOVA significant annual differences in macroinvertebrates were found in all of the stream reaches during both seasons. However, the trait based NMDS and permutational MANOVA found significant change only in one removal site …
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Analysis of Molecular Dynamics Simulations of Protein Folding
… method, a nonmetric multidimensional scaling (nMDS) technique, which achieves superior data compression by virtue of being nonlinear, and also provides a clear insight into the structural processes underlying MD trajectories. I illustrate the capabilities of nMDS by analyzing three complete …
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Novel Applications of Multivariate Methods for Exploring Personality in African Elephants
… space) for non-metric multidimensional scaling (NMDS) scores of each individual and dispersion of NMDS scores for each individual as a measure of behavioral plasticity. I analyzed the effects of plasticity and age on personality of individual elephants using a non-parametric multivariate analysis …
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CHARACTERIZING PATTERNS IN TEXAS GULF COAST BEACH DUNE PLANT SPECIES COMPOSITION
… analyzed using cluster analysis, ANOSIM, SIMPER, NMDS, and ISA for fives zones representing the foredune complex of twenty Gulf Coast beaches. ANOVA revealed that zones differ in terms of percent bare sand, percent vegetative cover, and species richness. Cluster Analysis, ANOSIM, and SIMPER …
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SPATIO-TEMPORAL DYNAMICS OF BIOMES IN THE NORTHWESTERN UNITED STATES (9000 YBP TO THE PRESENT)
… used non-metric multi-dimensional scaling (NMDS) on a merged database containing relative pollen percentages from the last 9000 years. A predefined list of environmental parameters and floristically and ecologically important pollen percentages were used to measure the dissimilarity between …
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SPATIO-TEMPORAL DYNAMICS OF BIOMES IN THE NORTHWESTERN UNITED STATES (9000 YBP TO THE PRESENT)
… used non-metric multi-dimensional scaling (NMDS) on a merged database containing relative pollen percentages from the last 9000 years. A predefined list of environmental parameters and floristically and ecologically important pollen percentages were used to measure the dissimilarity between …
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Evolution and ecology of body size in North American terrestrial mammals during the Paleocene and Eocene transition
… structure. Non-Metric Multidimensional Scaling (NMDS) was used to characterize communities. NMDS showed that the communities of the Paleocene were stable for most of the Paleocene while the communities of the Eocene were gradually changing. We specifically looked at the effects of the transition …
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GROUND BEETLES (COLEOPTERA: CARABIDAE) AS BIODIVERSITY INDICATORS FOR AGE STRUCTURE IN PIEDMONT FORESTS?
… results of non-metric multidimensional scaling (NMDS) and Detrended Correspondence Analysis (DCA) ordination both show a clear separation of forest age classes in terms of beetle community composition. Eighteen carabid species were identified as potential candidates for ecological indicators of …
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Effects of Stream Crossings on Macroinvertebrate Assemblages of the Upper Current River, Ozark National Scenic Riverways, Missouri
… effects among locations. Multivariate analyses (NMDS and a nested ANOSIM) also revealed strong differences in community composition among sites, as well as among locations. Taken together, the results indicate crossing disturbances during summer and winter 2009 were either too infrequent or small …
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BRYOPHYTE ASSEMBLAGES ON AMERICAN HORNBEAM (CARPINUS CAROLINIANA) AND THE SURROUNDING ARBOREAL COMMUNITIES WITHIN THE FOREST OF EAST TEXAS
… computed. Non-metric Multidimensional Scaling (NMDS) was used to determine bryophyte community and site variability. Percent Coverage, Shannon’s Diversity Index, and Pielou’s Evenness indicate that Carpinus trees have a significantly higher leafy liverwort component than that of Non-Carpinus …
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Characterizing spatial and temporal trends in fish community diversity in the inland lakes of Isle Royale, MI, USA
… to identify lakes and species changing most, and NMDS to examine lake factors influencing composition. Mean richness and slopes of species-area curves did not significantly differ between surveys, although both declined slightly. Overall community composition and spatial variability among lakes …
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Sample Collection and DNA Extraction Methods for Environmental DNA Metabarcoding in Headwater Streams
… plots using non-metric multidimensional scaling (NMDS), this study was not able to reveal differences in the amount of taxa richness between CTAB and DNeasy, which implied extraction methods may not be a limiting factor in detected taxa richness. </p>
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Investigating Nekton Response to Changing Salinities in the Mississippi Sound: An Experimental and Statistical Approach
… field survey data were analyzed using PCA, NMDS, and a negative binomial GLM to investigate how salinity and temperature influence the abundance of blue crab, Atlantic croaker, bay anchovy, and brown and white shrimp. Results varied by species, with some likely benefiting from prolonged …
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Landscape history and contemporary environmental drivers of microbial community structure and function
… with water availability as the first axis of an NMDS ordination was strongly related to shifts in soil moisture content. CCA revealed that tills explained only 3.4% of the variability in community similarity among sites, while geochemical variables explained 18.5%. Extracellular enzyme activity …
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FROM TURF TO TURF: FUNGAL INVASION OF ASCOCORYNE TURFICOLA IN A NORTHERN MICHIGAN BOG
… continue spreading. Using a combined approach of NMDS ordination and a case-controlled, binomial logistic repression, I modeled the vegetation and environmental variables associated with <em>A. turficola</em>. The strongest plant indicators were <em>Rhynchospora alba </em>and <em>Eriophorum …
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Aronia mitschurinii: Solving a Horticultural Enigma
… Beauty’. Non-metric multidimensional scaling (nMDS) clustered <em>A. mitschurinii</em> apart from wild <em>Aronia </em>spp., and demonstrated a relationship between <em>Sorbus aucuparia</em>, ×<em>Sorbaronia fallax</em>, and <em>Aronia</em>. Bayesian analysis revealed <em>A. mitschurinii</em> …
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