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 14 of 14 for “"Arid zones"”.
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Ancient origins of a diverse stygofaunal group: The Australian Bathynellidae (Crustacea)
… groundwater). In Australia, particularly in the arid zones of Western Australia, a rich hypogean assemblage has been discovered in the past few decades, largely due to surveys required as part of environmental impact assessments for, and imposed conditions on, mining operations. Bathynellidae …
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Assessment of genetic variations within and between populations of Marama Bean (Tylosema Esculentum (Burchell) Schreiber) based on Microsatellites (SSRS) and Intergenic spacer length variation markers in the Namibian germplasm
… drought tolerant legume that is endemic to the arid and semi-arid zones of southern Africa. Its agronomic potential is on the basis of its seed's nutritional composition that is comparable with soybean and peanut, the two mostly consumed legumes. In this study SSR markers were used to assess …
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Irrigation of acacia and eucalyptus species with waters of different salinities in a semi-arid environment in Formentera, Balearic Islands
… rates could be obtained for trees in a semi-arid environment (Formentera, Balearic Islands) using small quantities of highly saline irrigation water. Soil improvement and avoidance of detrimental long term effects was a prime objective. Two species, Eucalyptus gomphocephala D.C. and Acacia …
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A study of urban form; its analysis and its implications for sustainable settlements in desert environments, with Walvis Bay as a case study
… on the issues of urban sustainability in arid zones. Arid zones can be considered as the last frontiers of urban and rural expansion, and the prevailing trends of the last 30 years have indicated that these areas are experiencing rapid urbanisation. Due to extreme climatic conditions, it …
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How air temperature affects flight initiation distance in arid-zone birds
Arid zones, such as the Kalahari in southern Africa, are experiencing an increase in the number of hot days, as well as in the intensity of heat waves. Research is being conducted to try and understand how increasing temperatures will impact bird communities and population persistence in these …
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Utilization of water and light resources by annual crops under semi-arid conditions when planted between Leucaena leucocephala (Lam.) de Wit hedgerows
Agriculture for rural communities in semi-arid areas is a risky exercise. The adverse weather conditions (high evaporative demand and low rainfall) of these regions, coupled with comparatively limited mechanization and often soil of poor chemical and physical constitution make crop production …
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The roles of exotic and native tree species in preventing desertification and enhancing degraded land restoration in the north east of Libya. Reciprocal effects of environmental factors and plantation forestry on each other, assessed by observations on growth and reproductive success of relevant tree species, and environmental factors analysed using multivariate statistics.
Today's arid and semi-arid zones of the Mediterranean are affected by desertification, resulting from various factors, including climatic variations and human activities such as overcultivation, overgrazing and deforestation. Afforestation programs are one of the most effective means in preventing …
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Investigation into land-use change in two contrasting areas in the Nile Delta, Egypt
… in environmentally vulnerable and and semi-arid zones, is crucial given the considerable pressures arising due to rapid population growth, climate change and desertification. The purpose of this research was to investigate the main drivers affecting land-use change in the eastern part of the …
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Impacts and management of Cenchrus ciliaris (buffel grass) as an invasive species in northern Queensland
… is also highly valued as a pasture species for arid and semi-arid zones. Quantitative studies are needed to determine its ecological effects. In addition, its spread into non-target areas, including conservation reserves, means that there is considerable interest in strategies for containing or …
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An Investigation into Sustainable Forest Policies and Practices in Syria
… land can be managed in a sustainable way in arid and semi-arid zones (ASAZs) of centralized countries is limited. Accordingly, this thesis seeks to analyse the role of government and communities, including women, in the formulation and implementation of sustainable forest management (SFM) …
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The phylogenetics and evolution of Africa's Larks (Alaudidae)
… million years ago possibly by the processes ofarid corridor vicariance. A conservation assessment of Beesley's Lark (Chapter 6) showed it to be Critically Endangered with a range of 40-65 km2 and an estimated global population of 92-286 individuals. For South African Chersomanes albofasciata, …
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The phylogenetics and evolution of Africa's Larks (Alaudidae)
… million years ago possibly by the processes ofarid corridor vicariance. A conservation assessment of Beesley's Lark (Chapter 6) showed it to be Critically Endangered with a range of 40-65 km2 and an estimated global population of 92-286 individuals. For South African Chersomanes albofasciata, …
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Ecología, caracterización y evaluación agronómica del taxon "Vicia Amphicarpa" Dorthes
… possibility of producing a forage of quality in arid and semi-arid zones and resistant to the effects of grazing during flowering and maturing. The present thesis intends to contribute to the knowledge of the taxon Vicia amphicarpa, through the study of its habitat, morphologic variability within …
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Urban Design and Outdoor Thermal Comfort in Warm Climates. Studies in Fez and Colombo
In many developing tropical countries, rapid urban growth leads to several problems, including increased thermal stress. This has negative consequences for people's health and well-being, and affects social and commercial outdoor activities negatively. Consequently, the creation of thermally …