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 259 for “"Floristic"”.
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Phytophthora diversity in the Cape Floristic Region
The biodiversity in the Cape Floristic Region of South Africa faces many threats from anthropogenic sources such as the trade associated with our globalized economy. Aggressive plant pathogens in the genus Phytophthora are of particular concern because of their capacity to invade and change plant …
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Geological Control of Floristic Composition in Amazonian Forests
… inventory; to use these methods to identify floristic patterns and their causes in western Amazonia; and propose new means to map floristic patterns in these forests.</p><p> Using tree inventories in the vicinity of Iquitos, Peru, I and a colleague systematically evaluated methods for rapid …
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Evaluating taxonomic surrogates for floristic quality assessment of wetlands
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01
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Vascular Floristic Study of the Piute Mountains, Kern County, California
<p>This study describes the vascular flora of the Piute Mountains, located at the southern terminus of the Sierra Nevada in Kern County, California. The study area covers ca. 543 square km (210 square mi), with elevations ranging from 777 m (2,550 ft) to 2,562 m (8,406 ft) at Piute Peak. Though …
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An examination of temporal trends, regional variation, and habitat-type differences in site-level Floristic Quality, and their implications for the use of Floristic Quality Assessment
Floristic Quality Assessment (FQA) is a measure of site conservation value. It is premised on using an area’s plant species composition and diversity to estimate its human disturbance and degradation levels. FQA metrics are increasingly popular and influential for making land conservation, …
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Floristic quality assessment of grassy slough preserve in Johnson County, Illinois
In the Lower Mississippi River Alluvial Valley (LMRAV), which stretches from southern Illinois to the Gulf of Mexico, approximately 7 million hectares of bottomland hardwood forest have been converted to agricultural production. Approximately 750,000 hectares of the eastern United States have been …
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Floristic dynamics of Appalachian pine-oak forests over a prescribed fire chronosequence
Vegetation dynamics after prescribed fire were modeled on three mountains in the George Washington National Forest representing a chronosequence of conditions since burning: pre-burn, and 1, 2 and 12 years post-treatment. Vegetation structure was more affected by environmental and spatial (burn …
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A Floristic Study of Ha Ha Tonka State Park, Camden County, Missouri
Between the fall of 1994 and the Spring of 1996, a list of the vascular flora of Ha Ha Tonka State park (Camden County, Missouri) was compiled from existing herbarium specimens (Ozark Regional Herbarium and Missouri Department of Natural Resources), previous collections made by Marilyn Groves and …
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Plants as biotic indicators of Neogene palaeoenvironmental evolution in the Cape Floristic Region
Comparative biologists have refined the synthesis of molecularly dated phylogenies and ecological data into an important tool to reconstruct the evolution of species and biomes, and to unravel the history and role of abiotic determinants of diversity patterns (fire, climate, tectonism). This has …
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Determinants of species composition, functional leaf traits, and floristic quality in restored wetlands
This Thesis was approved for publication on 2021-11-24 at 13:14.
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The many forms of thirst : investigating forest constraints in the Cape Floristic Region
… the primary constraints of forests in the Cape Floristic Region (CFR), in South Africa. Based on a study by Lehmann et al. (2011) on savanna ecosystems, it was hypothesised that seasonal drought and moisture balance were more likely to limit forest distribution than broader rainfall patterns. …
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Polyploid speciation in the Greater Cape Floristic Region : species limits within Ehrhara calycina
… core distribution lies within the Greater Cape Floristic Region (GCFR). Importantly, it shows a high degree of morphological and ploidy level variation. Based on observations of distinct forms co-occurring at multiple sites, the hypothesis that E. calycina comprises more than one species was …
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Floristic and dynamics of Sand Forest, a subtropical dry forest type in South Africa
Unlike most dry forests, Sand Forest has been largely untransformed by human activity until very recently, and provides a rare opportunity to investigate the dynamics of old-growth dry forests. Twinspan classification and DCA ordination (Detrended Correspondence Analysis, an indirect gradient …
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The functional, ecological and evolutionary significance of culm structures in the Cape Floristic Region
The Cape Floristic Region lies in the southwestern Cape, South Africa, and is known for its high species richness and endemism. This Mediterranean-type climate region receives winter rainfall that averages between 250 and 650 mm annually over most of the region but reaches an average of more than …
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Evolutionary patterns in Thamnochortus (Restionaceae) : a study of specification in the Cape floristic region
Patterns of speciation and potential evolutionary pressures and constraints were investigated in the genus Thamnochortus. Phenetic methods were used to define boundaries of species prior to cladistic analyses. Comparative techniques were employed to investigate aspects of dispersal biology and fire …
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Phylogeography and population genetics of two forest endemic mosses in the Cape Floristic Region
Different histories for forests in Southern Africa have been hypothesized from vegetation biogeography and pollen analysis. However, the history of forests is still controversial. Phylogeography uses gene genealogies to infer history of distributions. Two forest endemic moss species were sampled: …
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Wildfires in the Cape floristic region : exploring vegetation and weather as drivers of fire frequency
… and temporal patterns of wildfires in the Cape Floristic Region (CFR). It focused on the factors that influence fire frequency; namely vegetation age, ignition sources and weather conditions. This work was done to aid decisions on fire management in fynbos nature reserves. Fire intervals were …
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