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 51 for “"Plant species richness"”.
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Patterns of plant species richness and diversity across two habitat types in the Upper Karoo, South Africa
… this study was to relate fine-scale patterns of plant diversity and community structure to broader-scale vegetation mapping in the Karoo regions. It also investigated the role of several environmental and climatic variables as drivers of species richness, relative cover, and growth form diversity …
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Competitive Effects Of Increased Plant Species Richness And Increased Endemic Versus Native Generalist Species Dominance On The Invasive Grass Microstegium Vimineum During Oak Woodland Restoration
The hypothesis that species-rich assemblages are resistant to invasion by non-native species has generated considerable research and controversy. However, the relevance of such research to the conservation of biodiversity is questionable, given that local species richness often does not correlate …
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Evaluation of Digital PCR (dPCR) for the Quantification of Soil Nitrogen Turnover Bacteria in Wetland Mesocosms in Response to Season, Fertilization, and Plant Species Richness
… likely due to a combination of factors such as plant species-specific assimilation behavior, the effects of plant communities on microbial diversity and function, and variable nitrogen inputs. In this study, the effect of plant species richness (i.e., number of plant species in a system) and …
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Vascular Plant and Vertebrate Species Richness in National Parks of the Eastern United States
Given the estimates that species diversity is diminishing at 50-100 times the normal rate, it is critical that we be able to evaluate changes in species richness in order to make informed decisions for conserving species diversity. To contribute to the ongoing analysis of species richness …
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Plant diversity, preference, and psychological well-being
… of research investigated the relationships among plant diversity in natural landscapes, aesthetic perceptions, and health outcomes. These studies, however, reported mixed effects—positive, no relation, and negative. Furthermore, studies that examined the health effects of plant species richness …
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Tetraria triangularis (Boeck.) C.B. Clarke and the Cape fold archipelago : an analysis of genetic and morphological variation in a high-altitude species native to the moutains of the Cape floristic region
… Floristic Region (CPR) is renowned for its high plant species richness and high floristic endemism (Marloth 1929, Takahatjan, 1986, Goldblatt and Manning 2000, Linder 2003). A small number of clades (33) account for 50% of the species diversity, indicating that much of the diversification has …
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Fire Severity and Plant Community Dynamics in the Australian Alps, Southeastern New South Wales
The effects of fire on plant communities are a subset of a broader range of spatial and temporal influences on plant community dynamics. Widespread unplanned fires in the Australian Alps in 2003 provided a unique opportunity to investigate the response of vascular plant species to high severity …
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Fire Severity and Plant Community Dynamics in the Australian Alps, Southeastern New South Wales
The effects of fire on plant communities are a subset of a broader range of spatial and temporal influences on plant community dynamics. Widespread unplanned fires in the Australian Alps in 2003 provided a unique opportunity to investigate the response of vascular plant species to high severity …
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Assessment of the ecological integrity of two wetland sites within Eastern Michigan University’s Fish Lake Environmental Education Center (FLEEC)
… Center, a bog and one vernal pool, was assessed. Plant species richness was used to conduct Floristic Quality Assessments (FQA) using the coefficient of conservatism and wetland indicator status for each species. The Michigan Rapid Assessment Method (MiRAM) was conducted as a more comprehensive …
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Enhancement of Floral Species Richness in Glaciated Prairie Temporary Wetlands
… Pothole Region wetlands frequently recover plant species richness resembling undisturbed conditions. However, plant species richness in temporarily flooded wetlands often recovers poorly due to colonization by aggressive undesirable species. This study was conducted during 1995 and 1996 in …
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WHITE SPRUCE (PICEA GLAUCA), MOOSE (ALCES ALCES) AND THE ORIGIN OF A ZOOTIC DISCLIMAX COMMUNITY ON ISLE ROYALE
… layer. I investigated the response of woody species to savannas which have emerged in Isle Royale National Park as a result of moose herbivory. I used dendrochronological methods and microsite plots to describe the spatial, temporal, and competitive responses of white spruce (<em>Picea …
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Effects of pine invasions on ground-dwelling ants on the southern slopes of the Swartberg Mountains
Ant and plant assemblages in patches of Pinus species trees in mountain fynbos and renosterbos (Elytropappus rhinocerotis) shru.bland were investigated in order to detennine whether there were differences in ant and plant species richness, abundance and cover between patches of pines and the …
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The Role of Gopher Tortoise Burrows (Gopherus polyphemus) in Shaping Herpetofaunal Diversity in the Sandhills of Southeast Georgia
… large numbers of invertebrate and vertebrate species associated with their burrows. I compared herpetofaunal species diversity and richness at Gopher Tortoise burrows and random points not near burrows on a sandhill in Southeast Georgia. I also compared habitat structure between burrows and …
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Microbial diversity and activity in temperate forest and grassland ecosystems
… oxidizing bacteria (AOB) community structure and richness as an integrated part of soil functioning. This research aimed at investigating the effect of aboveground plant diversity on ammonia oxidizing bacteria diversity and function in forest and grassland soils with focus on the influence of (a) …
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Effects of Water Table Depth and Edaphic Characteristics on Plant Diversity in a Southern Mississippi Pitcher Plant Bog
… table depth and soil characteristics have on plant species richness and species composition within pitcher plant bogs across seasons. Eight piezometers were installed at random distances to monitor long-term water table depth and pressure fluctuations along a ~710-meter line transect …
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Relationships between loblolly pine (Pinus taeda L.) yield and woody plant diversity in Virginia Piedmont plantations
… on loblolly pine (<i>Pinus taeda</i> L.), woody plant diversity, and wildlife habitat quality in Virginia Piedmont plantations 12-14 and 24-27 years of age. The responses of loblolly pine and competing woody vegetation in plantations 12-14 years of age were analyzed at 8 levels of competition …
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Determinants of native and exotic plant species diversity and composition in remnant oak savannas on southeastern Vancouver Island
… influence the distribution of native and exotic species in ecological communities. I examined the regional- and local-scale determinants of native and exotic vascular plant species richness and composition in a highly fragmented oak savanna ecosystem on southeastern Vancouver Island. In sharp …
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The Role of Native Diversity and Successional Processes on Communityinvasibility in Riparian Primary Forest
… and address the following: 1) Does exotic species richness and percent cover change across successional time? 2) What is the relationship between native and non-native diversity and does that relationship change through succession? Vegetation surveys were conducted to quantify plant species …
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