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 15 of 15 for “"successional stage"”.
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Impact of clearcutting on indigenous mammals of southwest Virginia
… of 6 mammal species. Additionally this successional stage showed the highest overall population of small mammals. White-tailed deer used the entire area of both clear cuts, however, use was predominantly in the first 61 m from the forest edge in the 2-yr cut and from 30.5 to 122 m in the …
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The Effects of Mammalian Herbivores on Successional Grasslands in Central Illinois
… granivory affected plant communities in any successional stage. Rodents did not prefer larger seeds. Herbivory by rabbits and rodents influenced the plant communities more than did consumption or dispersal of seeds. Both groups of animals reduced abundance of palatable forbs and increased …
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Soil Heterogeneity Changes During Forest Succession: Test of a Model Using Univariate and Geostatistics
… US along a chronosequence of a replicated successional forest sere (1, 6, 10, 25, and 80 years) to elucidate the temporal changes in soil spatial heterogeneity. Samples were collected from loblolly pine plantations representing reorganization through aggradation phases of succession, and …
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Effect of isolation on the composition of soil seed banks on the Atherton Tableland, northeast Queensland, Australia
… to recreate, establish, and accelerate natural successional processes. Tropical rehabilitation has occurred on the Atherton Tableland for 15 years. Currently, rehabilitated sites on the Atherton Tableland are monitored by tree planting agencies for two to three years to reduce exotic species. …
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Comparison of Bare Root vs. Potted Plants, Species Selection, and Caging Types for Restoration of a Prairie Wetland, and Quantitative Analysis and Descriptive Survey of Plant Communities and Associations at Lewisville Lake Environmental Learning Area (LLELA), Lewisville, TX
… demonstrates the characteristics of an early successional community, dominated by weedy species. Prairie communities are dominated by Johnson grass and ragweed, with climax tall grass prairie communities only in areas that have been planted with native grass seed. Forest communities are …
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Ice storms as a disturbance factor in Appalachian oak forests
… gaps, shifting the stand to a more advanced stage. Alternatively, extensive canopy damage allows more light to reach the forest floor perhaps favoring the germination and establishment of pioneer seedlings. Survival of these individuals would return the community to an earlier successional …
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Mapping mixed and fragmented forest associations with high spatial resolution satellite imagery : capabilities and caveats
… a broad classification based on structural (successional) stage and a finer classification of late seral vegetation associations. The finer-scale classification also incorporates ancillary landscape positional variables (elevation and potential soil moisture) derived from Light Detection and …
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The effects of mammalian herbivores on successional grasslands in central Illinois
… mid-western grassland communities at different stages of development, in spite of a substantial literature indicating the potential of mammals to impact the composition of these plant communities. Mice and voles consume large seeds, and rabbits disperse small seeds endozoochorously. Voles, …
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The nature and significance of microtopographic effects on vegetation succession on selected glacier forelands, Jotunheimen and Jostedalen, Norway.
… explanation of the vegetation in terms of both successional stage and environmental factors. The principal research contributions are under three headings: findings; presentation techniques; and literature review. The most important findings refer to the major influences on subalpine and alpine …
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Post-management vegetation change in upland heather moorland, with particular reference to the nutrient status of soils : Lake Vyrnwy Estate, Powys, Mid Wales
… heather-dominated vegetation is in a successional stage and management is required to prevent its progressive transformation into rough grassland and woodland scrub. Traditionally management by burning and more recently by mowing has been used to achieve this by encouraging the growth …
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Oil palm expansion and land cover changes in the Peruvian Amazon: implications for forest conservation and fire mitigation
… of the correlation depend on drought severity, successional stage of regrowing vegetation and oil palm age. The results suggest that the promotion of forest regrowth and the establishment of oil palm plantations outside forests can be effective at reducing fire occurrence and spread when they …
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Development of image analysis techniques to enable low-cost tropical rain forest monitoring
… prevalence of key tree species indicative of the successional stage of forest recovery and demonstrate the utility of this approach for guiding management. I find that using an extra camera to take photographs with additional wavebands only slightly improved mapping accuracy. Finally, I use a …
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Taxonomic homogenization of plant communities in Illinois wetlands and the role of wetland compensation
… layers, which may reflect differences in successional stage between natural and compensation wetlands. Although compensation herbaceous emergent wetlands do not, by themselves, represent a more homogenous set of communities at the regional level, there is a high degree of compositional …
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Managing open habitats for species conservation : the role of wild ungulate grazing, small-scale disturbances, and scale
… in a 160 ha game preserve in NE Germany in three successional stages (i) Corynephorus canescens-dominated grassland, (ii) ruderal tall forb vegetation dominated by Tanacetum vulgare and (iii) Pinus sylvestris-pioneer forest over three years. Our results demonstrate that wild megaherbivores …
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Artenkombination, Etablierungsstadium und anthropogenes Störungsregime als Einflußfaktoren auf die Bestandsentwicklung der invasiven Brassicaceae Bunias orientalis L. und Rorippa austriaca (Crantz)Besser in experimenteller Vegetation
Einerseits werden anthropogene Störungen oft genannt, um erfolgreiche Invasionen von invasiven Organismen in ihren neuen Arealen zu erklären. Andererseits sind gängige Theorien pflanzlicher Invasionen häufig für ihren limitierten erklärenden und voraussagenden Wert kritisiert worden, hauptsächlich …