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 27 for “"drought response"”.
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Germination success and drought response in Erica coccinea
… seeders are predicted to withstand the mild droughts of the southwest CFR better than Erica resprouters, which would account for the abundance of seeders in this region. This thesis tested the assumptions that 1) seeders germinate more quickly and successfully than resprouters and 2) seeders …
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Drought Response Mechanisms and Adaptation: An Analysis of Strategies Adopted by Wine Grape Farmers in the Western Cape
This thesis examines the response mechanisms and adaptation strategies adopted by grapevine farmers to counteract the effects of the 2015-2018 Western Cape drought, which was characterised as particularly rare and severe. The challenges that emerged during the drought within the study area were …
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Cape Town crisis: An analysis on drought response measures, the motives behind them, and their implications for equitable water access
… changes within its water management strategy in response to a three-year drought (2015-2018). Due to the vulnerability of humanity to climate change, its uncertainty, and the risks that it poses for securing a reliable source of water, it is important to fully understand the implications of Cape …
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Exploring the contributions of cross-sector collaborations to Disaster Risk Reduction in the city of Harare: an investigation through a drought response lens
… on slow-onset disasters such as multiple year droughts. There is also limited research on the contributions of cross-sector collaborations towards Disaster Risk Reduction in African cities. For this study, I set out to investigate cross-sector collaboration efforts contributing to drought …
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An Investigation into Transformation and RNA Editing in the Lolium Plastome
… (NADH dehydrogenase complex) in relation to the drought response of several accessions of perennial ryegrass. Previous studies have shown that the NDH complex is involved with countering oxidative stress during environmental stresses like drought. Due to the nature of RNA editing within this …
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The role of the BHLH038 transcription factor in the regulation of osmotic and drought stress responses in Arabidopsis thaliana
… stress affecting agriculture worldwide is drought. In order to ensure food supply for the expanding world population two critical tasks must be undertaken; maintenance of crop yield as well as the increase of yield potential. Plants have built up a complex stress response system in order to …
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The role of hydraulic strategies in understanding the response of fynbos to drought
… McDowell et al., 2008) in understanding the response of diverse communities to drought. This framework distinguishes species that respond to dehydration by rapidly decreasing stomatal conductance (gs) (isohydric), thereby maintaining relatively constant midday minimum water potential, from …
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Soil moisture-based drought monitoring using remote sensing over Africa
Agricultural droughts, or persistent deficits in soil moisture, can have severe consequences on crop production and can result in economic crisis and widespread food insecurity. The impacts of drought are especially relevant in Africa, where agriculture is largely supported by rainfall. Currently, …
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Physiological variation of Garry oak (Quercus garryana) seedlings to drought stress
… was to determine physiological differences in drought response among Garry oak (<em>Quercus garryana</em> Douglas ex Hook. [Fagaceae]) seedlings that grow in distinct populations in Washington state, in order to aid in restoration efforts by informing growers of the potential differences …
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A theoretical and empirical framework for measuring minimum conductance, an understudied plant drought trait
In light of increased drought frequency and intensity due to climate change, knowledge of how plant drought tolerance is affected is important for understanding plant vulnerability to these changes. Minimum conductance (gmin) describes the residual rate of water loss by a plant through its leaves …
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Drought in the Colorado River Basin: Spatiotemporal Analysis using an Edge Detection Filter
A detailed history of drought variability in the Colorado River Basin for the last half millennium was obtained using tree ring-widths of precipitation sensitive trees as a proxy record of past climatic conditions. A one-dimensional edge detection filter was applied to standardized ring-width …
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A Dynamic Decision Support System for Drought Resiliency and Climate Change
… This can be most challenging in times of drought, when available water is slim and the utility system is most stressed. Across the west, these drought planning challenges are further exacerbated by ever increasing water demands, and a changing climate may be accentuating weather …
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Physiology, genetics and genomics of drought adaptation in Populus
… global change, predictions indicate that summer droughts will increase in frequency and intensity over Europe. This study was carried out to evaluate the adaptation to drought in Populus, at different levels: genetic, genomics and physiology. Forests trees such as poplar are very important …
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Regulation of desiccation tolerance in Xerophyta seedlings and leaves
… and 5%) to identify the networks activated in response to water loss. Desiccation was associated with successive waves of transcription factor induction, as well as widespread down-regulation of histone modification enzymes. Many seed-specific genes, such as late embryogenesis abundant (LEA) …
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Evaluation of physiological traits and identification of QTLs for drought tolerance in hexaploid wheat (Triticum aestivum L.).
… parts: a comparative physiological study of drought responses under controlled conditions; a genetic study to construct the skeleton map of a doubled haploid (DH) population; and a quantitative trait loci (QTL) analysis to identify QTLs associated with drought tolerance traits in the field. …
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SILVER FIR AND ITS PROVENANCES IN A CLIMATE CHANGE PERSPECTIVE
CHAPTER 2: Drought responses of Italian silver fir provenances in a climate change perspective. In a climate change perspective, the resilience of Mediterranean forest ecosystems is closely linked to their ability to cope with drought and rising temperatures. This ability can be influenced by …
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Understanding multiple health risks for low-income communities in Cape Town: water stress, COVID-19, and climate change
Climatic hazards, such as flooding and drought, are expected to increase in frequency as a result of climate change. Growing evidence suggests that climate-induced water challenges will interact with health concerns, compounding pre-existing challenges for vulnerable populations in low-and …
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Drought tolerance and implications for vegetation-climate interactions in the Amazon forest
… timescales, the Amazon forest is resistant to drought, but more severe droughts can have profound effects on ecosystem productivity and tree mortality. The majority of climate models predict decreased rainfall in tropical South America over this century. Until recently, land surface models have …
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Physical and geochemical response in cave drip waters to recent drought, central Texas, USA : implications for drought reconstruction using speleothems
… to assess the physical and geochemical response of cave drip waters to extreme drought. Drip rate, calcite growth rate, and dripwater geochemistry were monitored before, during, and after the peak of a record-breaking drought in central Texas that began and peaked in 2011, and which …
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