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 11 of 11 for “"Seasonal Drought"”.
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Influence of seasonal drought on body condition and nutritional state in selected tropical birds
… evidence is emerging that the severity of seasonal drought can affect the viability of bird populations. For example, analyses on a long-term mark-recapture study in central Panama showed that longer dry seasons have a significant negative effect on population growth rates in nearly a third …
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Near Real-time Seasonal Drought Forecasting and Retrospective Drought Analysis using Simulated Multi- layer Soil Moisture from Hydrological Models at Sub- Watershed Scales
This study proposes a stratified approach of drought severity assessment using multi-layer simulated soil moisture. SWAT (Soil and Water Assessment Tool) models are calibrated for 50 watersheds in the South-Atlantic Gulf region of the Southeastern US and a high-resolution daily soil moisture …
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The many forms of thirst : investigating forest constraints in the Cape Floristic Region
… on savanna ecosystems, it was hypothesised that seasonal drought and moisture balance were more likely to limit forest distribution than broader rainfall patterns. The biomes of the CFR were mapped using Mucina & Rutherford’s (2006) vegetation map. Environmental data was extracted from Schulze …
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Preliminary Investigations Into the Etiology and Pathogenesis of Equine Leucoencephalomalacia
… disease which tends to occur in sporadic seasonal outbreaks in the United States. ELEM is most frequently seen between November and March following corn growing seasons marked by an early to mid-seasonal drought followed by wet and humid conditions accompanied by moderate to cool …
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Phylogenetic and functional growth from diversification in the Cape grass genus Ehrharta Thunb
… is associated with a historical transition to seasonallydrier but more fertile habitats, and the coincident or subsequent evolution of several growth form novelties (e.g. buried and swollen culm bases and annualness). These traits are interpreted to reflect divergent strategies for surviving …
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Germination responses of endemic land-races of Saudi-Arabian cereal species
… were saline, nutrient-poor, sandy and subject to seasonal drought and hot summers. Consequently, the work focused on responses of germination and early growth to salinity (0-1000 mM NaCl) and high temperatures, using mainly thermogradient plates and incubators. I examined germination rate, …
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The relationships between forest and mountain fynbos communities in the southwestern Cape Province of South Africa
… moist sites in the southwestern Cape because of seasonal drought and high fire frequency in adjacent fynbos shrublands. However, soil moisture has not been demonstrated as the controlling factor. Succession to forest has been observed in some areas and not all forest trees in the fynbos are …
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The natural history, sensory ecology and biogeography of the seed dispersal of large fruits in Fynbos
… and positively influenced by more intense seasonal drought and longer fire return interval in the GCFR, respectively. Overall, this thesis advances our understanding of large-fruited Fynbos plants, providing unique insights into their natural history, ecology, evolution, conservation and …
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Drought tolerance and implications for vegetation-climate interactions in the Amazon forest
On seasonal and annual 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 …
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The timing of growing season drought and its effects on above- and belowground production in a mesic grassland
… dry are expected to get drier and the timing of seasonal drought - defined as a prolonged absence or marked deficiency of precipitation - is expected to change. Although drought in general has been extensively studied, particularly in grasslands, we know little about how natural ecosystems will …
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Leaf Volatile Emissions Structure Tree Community Assembly and Mediate Climate Feedbacks in Tropical Forests
… enhance leaf tolerance to high temperatures and drought. Isoprene is a volatile secondary metabolite produced in the chloroplast by approximately one-third of plant species. While the benefits of isoprene are supported by extensive laboratory and greenhouse-based research, work has only begun to …