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 24 for “"detrended correspondence analysis"”.
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Vegetation, diversity and rarity on the Cape Peninsula, South Africa
… a multivariate classification derived from the analysis of an extensive database (835 plots, 833 species). This rapid system of classification of fynbos showed an 81 similarity with Two-Way Analysis (TWA) classification. Detrended Correspondence Analysis (DCA) and Colonial Analysis (CCA) were …
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The paleoecology of the Keyser limestone: a re-evaluation
… of the Keyser fauna, utilizing cluster analysis, polar ordination, and detrended correspondence analysis, reveals that the fauna can be arranged along a gradient, according to distance from the shore. Recurrent communities do exist within the Keyser Limestone. With the aid of …
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A gradient analysis of Coleogyne communities in Southern Nevada
… woodlands had the lowest species richness; Detrended correspondence analysis (DECORANA) suggested that elevation and soil depth were significantly associated with the distribution of stand and species groups identified from two-way indicator species analysis (TWINSPAN) in the Spring and …
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Understory vegetation patterns in oak savannas of the Missouri Ozarks
… oak savanna sites in the Ozarks. Ordination by detrended correspondence analysis showed sites grouping by rhyolite, cherty dolomite, and limestone/dolomite substrate types. DCA axes correlated with landscape variables and fire frequency, but correlations were generally weak, suggesting that …
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GROUND BEETLES (COLEOPTERA: CARABIDAE) AS BIODIVERSITY INDICATORS FOR AGE STRUCTURE IN PIEDMONT FORESTS?
… 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 forest age. …
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Dinoflagellate paleoecology and biostratigraphy of the Middle Eocene Tallahatta and Lisbon Formations from the Baldwin County, Alabama, Core
… conducted by the ARCO Depositional Sequence Analysis Group to gather paleontological, sedimentological, paleomagnetic, geophysical, and geochemical data from the Alabama Coastal Plain for the purpose of calibrating the Tertiary time scale with the sequence stratigraphy of the Gulf region. A …
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Floristic and dynamics of Sand Forest, a subtropical dry forest type in South Africa
… Twinspan classification and DCA ordination (Detrended Correspondence Analysis, an indirect gradient analysis) of a wide range of forest samples in north-eastern KwaZulu Natal, South Africa, indicated that Tropical Dry Forest species composition differs substantially from all other forests, …
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Effects of Seasonal Burns on Avian Foraging in a Central Texas Ashe Juniper-Live Oak Savanna
… control. I did not find many defined trends from Detrended Correspondence Analysis; however foliage insectivores and ground insectivores had an even distribution in fall and winter months. The majority of grassland birds were omnivores and their distribution was uneven over the year. Managing …
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The Influence of Livestock grazing on Plant Species Diversity and Distribution at Kiranjeranje Ward-Kilwa District
… ward was studied using multivariate gradient analysis. Vegetation data were collected in 30 established plots using the stratified random sampling method. For each plot established environmental data on edaphic factors and anthropogenic disturbances were also collected. The plant species were …
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Organic-walled microplankton paleoecology and biostratigraphy of the Upper Cretaceous Ripley Formation, southwestern Georgia
… paleoecologic patterns. The results from cluster analysis and detrended correspondence analysis indicate the presence of four cyst associations. The <i>Deflandrea pannucea</i> association is interpreted as indicative of low salinity related to nearby river discharge. The <i>Deflandrea</i> sp. A …
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Sequence Stratigraphy and Paleoecology of the Late Mississippian Little Stone Gap Member in the Appalachians of West Virginia
… age constraints for fourth-order sequences. Detrended Correspondence Analysis (DCA) of paleontological bulk samples produced similar differentiation of habitats into carbonates and siliciclastics thereby demonstrating the importance of interpreting ordination patterns within a facies …
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The soil seed bank in Agathis australis (D. Don) Lindl. (kauri) forests of northern New Zealand and its potential role in secondary successions
… distance from forest edges are summarized using Detrended Correspondence Analysis (ordination) and linear regression models. A number of issues concerning secondary successions and the soil seed bank are discussed. These include: 1. The relationship between the soil seed bank and extant …
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Shallow subtidal seaweed communities of the Agulhas Marine Province of South Africa
… communities of this area were investigated using Detrended Correspondence Analysis, Canonical Correspondence Analysis and cluster analysis, in order to compare them with previous studies on the marine biogeography of the area. In the 85 quadrats that were sampled, 97 species of Chlorophyta, …
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Assemblage structure and shallow-water habitat use by small-bodied fishes at lower Missouri River sandbars
… and environmental factors were evaluated using Analysis of Variance, Detrended Correspondence Analysis, and Canonical Correspondence Analysis. Samples yielded 49 species from 13 families in depths 0.0-0.5 m; most fishes were [less than or equal to]105 mm TL. Fish mean length increased but …
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The abundance and diversity patterns of seaweed communities on natural and artificial substrata at Sodwana Bay, South Africa
… using line-point intercept methods. Multivariate analysis (detrended correspondence analysis) and cluster analysis (complete linkage Bray-Curtis) were used to show how substrata and season relate with respect to their seaweed flora. Additionally, Kruskal-Wallis nonparametric tests with pairwise …
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The Effect of Ecological Gradients on the Fish Assemblages of the Green and Tradewater River Basins of Kentucky
… relationships with canonical correlation analysis (CCA). Further analyses for the effect of environmental gradients on individual species were done with Pearson correlations. Species data were exposed to detrended correspondence analysis (DCA) to analyze the effect of geographic and local …
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Community and ecosystem analysis of forests recovering from landslide disturbance: White Mountain National Forest, New Hampshire
… Forest to data collected 40 years later. Detrended correspondence analysis is used to determine the major driving variables of succession during the two sample periods. The 1956 dataset suggests that site age was the primary driver of succession on this chronosequence. The 1996--98 data …
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The vegetation of Maud Island, Marlborough, New Zealand
… and Coprosma robusta. Two-Way Indicator Species Analysis resulted in the description of eight different plant communities on the island. Detrended correspondence analysis showed a high degree of turnover in species composition among these communities. Canonical correspondence analysis showed that …
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Changes In Fish Communties Throughout The Buck Creek Watershed In Relation To Land Use
… restoration relative to E. nebra conservation. A detrended correspondence analysis (DCA) was used to determine relationships between LULC and fish communities between years and spatial scales. A principal component analysis (PCA) of 1983 and 2020 LULC proportions was used to identify …
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Vegetation, diversity and rarity on the Cape Peninsula, South Africa
… a multivariate classification derived from the analysis of an extensive database (835 plots, 833 species). This rapid system of classification of fynbos showed an 81 % similarity with Two-Way Analysis (fWA) classification. Detrended Correspondence Analysis (DCA) and Canonical Correspondence …
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