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 104 for “"Leaf litter."”.
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Leaf litter ant communities in tropical lowland rain forests in Sabah, Malaysia
… patterns and responses of the community of leaf litter ants were studied in anthropogenically disturbed habitats and primary forests of different size. In logged over forests, only 70 per cent of the species of a primary forest were present even 25 years after timber extraction. The ant …
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Non-Native Leaf Litter Modifies Algal Resources with Effects on Tadpole Growth
<p>Leaf litter species play a key role in determining the quality and quantity of algal resources in aquatic ecosystems as a cross-boundary subsidy. The invasion of non-native plant species into forests can alter aquatic resources. I investigated the effects of non-native leaf litter species on …
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Ecological Assembly of Leaf-Litter Anuran Communities Across a Neotropical Land-Bridge Archipelago
… that underlie the community assembly of leaf-litter anurans on a Neotropical archipelago. I combined experimental and observational approaches to: first, identify patterns of body size variation in leaf-litter anurans; second, assess how coloration and body size variation in a territorial …
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The Effects of Ecological Restoration on Soil Microbial Enzyme Activities and Leaf Litter Decomposition
… in both soils and on decomposing Quercus falcata leaf litter in unburned, burned, and burned and thinned plots in a mesic forest in northern Mississippi. Rates of decomposition were also assessed for Q. falcata leaf litter at each plot. The restoration treatments decreased phosphatase activity in …
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Effects of leaf litter diversity on nutrients and mosquito communities in Neotropical artificial tree holes
… and Tectona grandis) to test the effects of leaf litter species composition and richness on invertebrate aquatic communities in Gamboa, Panama. We quantified macroinvertbrate species richness and abundances, leaf litter mass loss, and dissolved carbon to nitrogen ratios (C:N) after 4 weeks. …
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The influence of leaf litter and plants on soil respiration before, during and after a severe drought
… with the addition of different amounts of leaf litter and the presence or absence of tree roots. In both experiments, soil respiration increased with litter inputs and decreased strongly during drought. However, I observed a larger pulse of soil CO2 efflux in response to litter inputs …
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Effect of a Water Treatment BMP on Nutrient Spiraling and Leaf Litter Breakdown in an Urban Stream
… the effect of this BMP on nutrient spiraling and leaf litter decomposition in a 2 km stretch of Weracoba Creek. I hypothesized the BMP would (1) reduce leaf mass loss over time and (2) interfere with nutrient concentrations and uptake lengths. I characterized leaf litter decomposition using tulip …
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THE INFLUENCE OF THE INVASIVE CHINESE TALLOW (TRIADICA SEBIFERA) LEAF LITTER ON AQUATIC CHEMISTRY AND MICROBIAL COMMUNITY COMPOSITION
… ecosystem diversity in a variety of habitats. Leaf litter from the Chinese tallow has been shown cause changes in dissolved oxygen and pH in the aquatic environment. Turbidity is also affected when Chinese tallow litter is present in water. A series of experiments were performed to determine …
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The influence of current year fire on leaf litter decomposition rates and microbial enzyme activity in forests undergoing ecological restoration
… through changes in environmental conditions or leaf litter composition. Restoration projects to reduce the effects of mesophication include thinning the canopy to remove mesophytic species and prescribed burn regimens to return the plant community to a fire tolerant and dependent one. However it …
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Drivers of leaf litter decomposition along a successional gradient in the upland Andes: linking environment, functional traits, biodiversity, and carbon cycling
Comprender los mecanismos que controlan la descomposición de la hojarasca es clave para explicar la dinámica del carbono en ecosistemas tropicales de montaña. Esta tesis doctoral tuvo como objetivo identificar los principales factores bióticos y abióticos que determinan la descomposición de la …
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The Role of Leaf Litter and Small Wood in the Retention of Fine Particles During Storms in an Appalachian Headwater Stream
… of particulates is largely unquantified. The litter exclusion study at Coweeta presented the opportunity to study a stream without litter input. I expected removal of leaf litter to reduce the capacity of the stream to retain fine particulate organic matter, FPOM. However, leaves are also a …
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The effects of the invasive exotic Chinese tallow tree (Triadica sebifera) on amphibians and aquatic invertebrates
This dissertation addresses the question of how leaf litter from trees affects animals that live in aquatic environments, with an emphasis on the effect of Chinese tallow (Triadica sebifera) leaf litter on anuran larvae (i.e., frog tadpoles). This question is important to our understanding of how …
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Decomposition Dynamics in Restored and Naturally Recovering Atlantic White Cedar (<i>Chamaecyparis thyoides</i>) Wetlands
… This work addresses how developmental stage, litter quality and environmental conditions influenced above ground leaf litter and below ground root decay in naturally regenerating and restored Atlantic white cedar wetlands. Using standard litterbags for leaf litter and a modified litterbag …
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Ecosystem Functional Consequences of Top Predator Mortality Due to the Invasive Shrub, Lonicera maackii
… densities, zooplankton densities, leaf litter mass loss, chlorophyll a abundance, biofilm growth, and availability of soluble nutrients. Of the 20 mesocosms that contained larval A. maculatum, only 11 produced metamorphs, and only one mesocosm with leaf litter from L. maackii …
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Comparing the effects of two types of Mulches on soil properties and the performance of selected woody species on a degraded land in Kunene region, Namibia
… the effects of two types of mulching materials (leaf litter and straw) on the soil's temperature, moisture content, and pH as well as the cumulative stem length, seedling survival, and leaf chlorophyll content of the selected species (Faidherbia albida, Catophractes alexandri, Vachellia erioloba, …
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The Effects of Agrochemicals on Litter Fungi
… and physiology of fungi inhabiting the litter layer were studied. When applied at normal field rates, the fungicides slightly reduced the total fungal numbers and species numbers isolated from leaf litter of Agrostis tenuis, although there were little or no effects with the herbicides at …
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Evaluation of Ecological Function of Urban Riparian and Stream Systems: Guiding Ecological Restoration in Austin, Texas, USA
… ecosystem function of a group of urban streams, leaf-litter decomposition was used as an integrated metric for assessing anthropogenic impacts. I measured leaf-litter decomposition rate with two species, Texas Red Oak (Quercus texana) and American Sycamore (Platanus occidentalis), as a response …
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The Role and Contribution of Saprotrophic Fungi during Standing Litter Decomposition of Two Perennial Grass Species, <i>Schizachyrium scoparium</i> and <i>Schizachyrium tenerum</i>
… enzymatically degrade, and assimilate plant litter carbon and nutrients in amounts sufficient to bring about the decomposition of plant litter. Here, I estimated the biomass and production of fungi and microbial respiration associated with decaying <em>Schizachyrium scoparium</em> and …
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Small Mammal Species Richness And Relative Abundance Across The Elevational Gradient And Microhabitats Of Pine Mountain, Eastern Kentucky
… of Kalmia latifolia stems, number of rocks, leaf litter depth, and elevation explained the most variation in abundances of small mammals. Sorex fumeus was more abundant at microsites with deeper leaf litter and more rocks, and less at lower elevation microsites with less canopy openness. …
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