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 25 for “"resprouting"”.
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Surviving the fire-trap: resprouting and carbohydrate partitioning of Acacia karroo after topkill
… topkill. The central hypotheses were that resprouting is dependent on root carbohydrate reserves and that very frequent topkill would progressively lower the carbohydrate reserves of a plant and eventually cause mortality.
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Patterns of carbon allocation, storage and remobilization in a common resprouting savanna species - Acacia karoo
The aim of this study was to gain a comprehensive understanding of the patterns of carbon partitioning, storage and remobilization in Acacia karroo during the juvenile life history stage. Tuber total nonstructural carbohydrate (TNC) concentrations and δ¹³C values were determined in plants from two …
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Nipping the bud hypothesis : a comparison of savannah and forest tree responses to canopy scorch
… two possible mechanisms for differences in crown resprouting following canopy scorch: (1) differences in bud banks and their insulation, (2) differences in the vulnerability to disruption of the hydraulic system by heat scorch. I simulated canopy scorch using nine congeneric savanna-forest pairs …
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Evolutionary patterns in Thamnochortus (Restionaceae) : a study of specification in the Cape floristic region
… compared between sister lineages of seeding and resprouting species. In species classified as resprouters individuals survive fire by resprouting from the rhizome. In a post-fire environment seeding species recruit from seed and not by resprouting. Resprouters were significantly taller than …
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Resilience and recovery of plant communities facing increasing fire severity
… further into recovery through persistence namely resprouting. I undertook a literature review of post-fire resprouting, revealing how increasing fire severity can reduce resprouting ability. Critically, interactions between fire severity and resprouting success were different across species and …
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Effects of repeated fire on the savanna / forest boundary
… despite high canopy cover created by tree resprouting. Tree mortality was cumulative with repeated burning (21% mortality post 2008 increasing to 47% mortality in 2012). This was linked to the vigour of post 2008 resprouting with much higher mortality of trees in 2012 that had few (<4) …
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Self-pollination in the genus Erica
… distance was found across the species. The resprouting Erica cerinthoides was found to have a UV signal, it also had the most dispersed population, highest nectar sugar concentration and a high degree of self-pollination. Erica paludicola, which is an endemic that occurs in only one other …
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Intraspecific variation in Erica coccinea
… forms: a resprouter form which survives fire by resprouting from dormant buds in a swollen lignotuber, and a seeder form which does not survive fire, but whose populations regenerate from fire-triggered seed germination. Previous studies have shown that these two regeneration forms are …
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Predicting the post-fire responses of two forest tree precursors after an autumn fire in mountain fynbos
… of surviving the fire and a 0.67 probability of resprouting. Size dependent fire survival was not related to root TNC concentrations but to the survival of meristematic initials. These findings suggest that current fire management practices which favour cool burns, promote the expansion of forest …
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How successful is grassland restoration after removal of pine plantations on the eastern shores of Lake St Lucia?
… Most notable was the large number of missing resprouting species in pine sites and that, in contrast to forest rehabilitation studies, no evidence for succession was found. The implication of this is massive as grassland rehabilitation may be a lot harder than was previously thought. It is …
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Demography and leaf physiology of Cornus drummondii in response to disturbance in tallgrass prairie
… a severe drought in the year of this study, resprouting shrubs had higher photosynthetic rates, stomatal conductance, and transpiration rates. Additionally, burned shrubs had morphological differences with reduced leaf mass per area and decreased leaf dry matter content. These results suggest …
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Fire-driven changes to tree drought vulnerability and carbon storage in temperate broadleaf forests
… seedlings to compare the importance of post-fire resprouting from environmental-mediated effects of fire on drought vulnerability. I then examined the impact of fire on climate-growth patterns of adult oaks by sampling increment cores from trees within a long-term fire manipulation experiment. …
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The ecology of congeneric resprouters and reseeders (Hypericum spp.) along fire-frequented pine savanna ecoclines
Resprouting and reseeding shrubs are predicted to be restricted to habitats with long and short return intervals of natural disturbances, respectively. Nonetheless, resprouters and reseeders co-occur along Gulf of Mexico coastal ecoclines where lightning-ignited fires were historically frequent. In …
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Invasion of coastal Acacia communities by Chrysanthemoides
… of double-burning were successful in limiting resprouting to 5% or less of plants but a problem still remained of seedlings which emerged from deeply buried seeds. Thus other measures such as biological control for which there is ample potential need to be assessed.
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Invasion of coastal Acacia communities by Chrysanthemoides
… of double-burning were successful in limiting resprouting to 5% or less of plants but a problem still remained of seedlings which emerged from deeply buried seeds. Thus other measures such as biological control for which there is ample potential need to be assessed.
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Changes in abundance and distribution of Protea caffra in the central and northern Drakensberg as a consequence of climate and land use change
… to enhanced growth rates, postburn recovery and resprouting of tree species in grasslands and savannas, which could account for the majority increase in P. caffra populations in the grassland of the Drakensberg. This has important conservation management implications for the reserve, in that the …
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In defence of flowers: The ecology and biochemistry of a chemical defence, cyanogenesis, in Proteaceae
… a non-mycorrhizal species that relies on basal resprouting following fire. Together this research provides evidence that foliar chemistry cannot be assumed to reflect whole plant chemistry (floral, root) and that both whole plant and fine-scale tissue-specific studies are required to understand …
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Variation in breeding systems and consequences for reproductive traits in Erica
… (P/O) ratios. However, indices suggest the resprouting form of E. mammosa to have an increased ability to self-fertilize while the seeder form has an increased ability for autonomous selfing. The 29 species analysed were divided into outcrossers and facultative outcrossers based on selfing …
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Tropical bracken, a powerful invader of pastures in South Ecuador: Species composition, ecology, control measures, and pasture restoration
… standing biomass by 65%. Monthly records of the resprouting bracken was necessary to work out the minimum number of treatments required for a clear control effect. For the five most efficient treatments among two to four applications were necessary. However, complete eradication of bracken was …
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The conservation genetics of the Clanwilliam cedar (Widdringtonia cedarbergensis)
… A major difference in their biology is the resprouting behaviour of W. nodiflora in response to fire. Fitness components in populations of W. cedarbergensis were divided into reproductive and "ecological" traits, and seedling growth traits. Reproductive and ecological traits were measured in …
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