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 43 for “"SHRUBLANDS"”.
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Soil Heterogeneity in Arid Shrublands: Biotic and Abiotic Processes
… temporal variability of soil moisture in arid shrublands.Our results support the biotic feedback between soil and hydrologic processes. On young, weakly structured soils with high overall conductivity, this biofeedback may act to retain moisture and not simply increase saturated conductivity …
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Studies of herbivory and vegetation change in Karoo shrublands
The broad objective of these studies was to view present landuse (extensive small stock ranching) in the Karoo against the background of relationships between indigenous plants and animals and to indicate how modification of herbivore regimes might affect this arid environment. Specific objectives …
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Leveraging the Landsat archive to characterize plant species diversity and post-fire recovery in Great Basin shrublands
Great Basin shrublands in the United States are rapidly converting to annual grass-dominated ecosystems, driven primarily by increased wildfire activity. Post-fire vegetation recovery trajectories vary spatially and temporally and are influenced by the effects of topography, climate, soils, and …
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Mojave Desert restoration: drought and facilitation influences on plant communities and soil seed banks in annual grass invaded shrublands
Non-native grasses, like Bromus rubens, have become widespread in arid ecosystems across the western United States, including the Mojave Desert. Their prolific seed production and rapid spread pose significant threats to native flora and wildlife habitats. These invasive grasses alter fire cycles, …
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The effect of altered rainfall seasonality on post-fire recovery of Fynbos and Renosterveld shrublands in the Cape Floristic Region
… climate change on fire-prone, Mediterranean-type shrublands globally because of the heightened sensitivity of post-fire vegetation to environmental conditions. In this thesis, I focused on investigating the relationships between rainfall seasonality patterns and post-fire vegetation processes in …
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Ecology of feral cats Felis catus and their prey in relation to shrubland fire regimes
… such as fire. I examined how the fire history of shrublands influences the ecology of feral cats Felis catus, dingoes Canis dingo and their prey species in Western Australia’s northern Wheatbelt region. A review of the literature revealed that feral cats inhabit a diverse range of ecosystems …
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Practices combining fire and grazing in the Central U.S. reduce woody encroachment and accommodate grassland and shrubland birds
Temperate grasslands and shrublands are critically endangered ecosystems receiving almost no protection, as nearly 50% of their global area has been lost and less than 5% has been set aside in reserves. To further complicate matters, in many instances these are alternate states of the same system, …
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Vegetation studies in the Humansdorp region of the Fynbos Biome
… diversity and growth form distribution in Cape shrublands and non-Cape vegetation types (subtropical thicket, Afromontane forest) in the Humansdorp region of the Fynbos Biome. The first paper is a re-evaluation of vegetation concepts in the study area and, more generally, in the Fynbos Biome and …
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ΒΟΤΑΝΙΚΗ ΣΥΝΘΕΣΗ ΚΑΙ ΘΡΕΠΤΙΚΗ ΑΞΙΑ ΤΗΣ ΤΡΟΦΗΣ ΤΩΝ ΓΙΔΙΩΝ ΠΟΥ ΒΟΣΚΟΥΝ ΣΕ ΘΑΜΝΟΛΙΒΑΔΑ ΜΕ ΔΙΑΦΟΡΕΤΙΚΗ ΑΝΑΛΟΓΙΑ ΣΕ ΘΑΜΝΩΔΗ ΚΑΙ ΠΟΩΔΗ ΦΥΤΑ
… VALUE OF GOAT DIETS WAS STUDIED IN THREESHRUBLANDS. THE DENSITIES OF THE THREE SHRUBLANDS WERE AS FOLLOWS: >(A) 53% SHRUB, 31% HERBAGE, (B) 60% SHRUB, 21% HERBAGE AND (C) 66% SHRUB, 11% HERBAGE COVER. ESOPHAGEAL FISTULA AND HAND PLUCKING METHODS WERE USED TO OBTAIN SAMPLES OFTHE GOAT'S …
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A gradient analysis of Coleogyne communities in Southern Nevada
… abundance in Coleogyne ramosissima (blackbrush) shrublands were compared on 15 elevational transects in the Spring and Sheep Mountain Ranges adjacent to the Las Vegas Valley. Coleogyne shrublands shared relatively broad upper and lower ecotones with Pinus-Juniperus and Larrea-Ambrosia vegetation, …
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Impacts of non-renewable resource extraction on shrubland songbird nest success and abundance
… emissions between impacted and non-impacted shrublands, or at a developed site with increasing distance from the wellpad. The presence of gas wells and related infrastructure were important influences on Field Sparrow (Spizella pusilla) nest success; survival was reduced close to the wellpad …
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The ecology of invasions by Pinus (pinaceae) and Hakea (proteaceae) species, with special emphasis on patterns, processes and consequences of invasion in mountain fynbos of the southwestern Cape Province, South Africa
… shrubs. These invasions have transformed fynbos shrublands to dense thickets of trees and shrubs in many parts of the region, thus disrupting various natural ecosystem processes. The ecology of invasions by species of Pinus and Hakea (the most successful genera) was studied using a series of …
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Spatio-temporal distribution of grass and shrubs at the ecotone between an arid grassland and succulent shrubland : ecological interactions and the influence of soils
… vegetation at an ecotone between the Namaqualand shrublands and Bushmanland arid grassland at the climatic transition between the predominantly winter rainfall Succulent Karoo and the predominantly summer rainfall Nama-Karoo biomess. The work focused on the determinants of grass and succulent …
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Plant water relations along a rainfall gradient, between the succulent Karoo and Mesic Mountain Fynbos, in the Cedarberg Mountains, near Clanwilliam, South Africa
… in the structure of the sclerophyllus evergreen shrublands of the five disjunct mediterranean-type ecosystems is thought to be the result of convergent evolution. In the Mediterranean, California, and Chile the length of the summer drought and the cold winter temperatures are hypothesized to be …
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Determining the potential drivers of invasive C4 grasses at De Hoop Nature Reserve, South Africa
… the shrub and tree component is generally C3. Shrublands, in contrast, are predominantly C3, for both woody and herbaceous species, though there can be a small C4 sedge and grass component. The C4 grassy biomes dominate the warm season rainfall region while C3 grasses predominate in the …
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Managing the wildlife resources of Senegal's forests and wildands
… of the wildlife resources in the forests and shrublands of Senegal. The project described the country area. It described 4 key subsystems of the greater system to show what resources exist, and what is a system, and how a single pattern of analysis and design can result in efficiencies and …
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Assessing Efficacy of Restoration Treatments in Juniper Savannas using Spatial Wavelets and Dot Grids on Aerial Photography
… juniperus are expanding onto open grass and shrublands and infilling open woodland areas. In Southern Arizona’s Clifton Ranger District, landscape-scale restoration treatments have been used to stall this expansion and reduce canopy-cover. This study utilizes and compares two techniques – …
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Assessing Efficacy of Restoration Treatments in Juniper Savannas using Spatial Wavelets and Dot Grids on Aerial Photography
… juniperus are expanding onto open grass and shrublands and infilling open woodland areas. In Southern Arizona’s Clifton Ranger District, landscape-scale restoration treatments have been used to stall this expansion and reduce canopy-cover. This study utilizes and compares two techniques – …
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