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Showing 1 to 20 of 60 for “"Proteaceae"”.
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Seed and seedling ecology of four Agulhas Proteaceae
Serotinous (canopy-stored seed) Proteaceae, Protea obtusifolia and Leucadendron meridianum occur on shallow, alkaline soils overlying limestone, and P.susannae and L.coniferum on adjacent, deep, weakly acidic sands, in fire-prone fynbos. Seed reciprocal transplants were used to test whether …
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Seed morphology and colour variation in derotinous Cape Proteaceae
I investigated seed colour polymorphism in Leucadendron is investigated for the possibility of crypsis in a post fire environment. Results were inconclusive, possibly due to a missed opportunity, but do not exclude the possibility of crypsis. Seed predation by birds may be an as yet undescribed and …
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The reproductive biology of four geoflorous Protea species (Proteaceae)
Pollination systems of previously unstudied plant species are often inferred from floral traits that are shared among unrelated plant taxa. However, these ‘pollination syndromes’ are often not reliable predictors of the primary pollinator of a plant species, and may in fact represent adaptations to …
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Effect of soil nutrient status on stress tolerance in Proteaceae
Protea lepidocarpodendron grown on low, medium and high nutrient treatments exhibited the lowest, and similar evapotanspiration rates respectively over a 9 day water stress cycle (experimental period). In stressed and unstressed treatments, stomatal conductance and transpiration rates of plants …
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Co-occurrence and phenological niche separation in rodent pollinated Proteaceae
Despite the numerous studies regarding rodent pollination in the Cape Floristic Region in the last few decades, little or no work has been done on patterns of co-occurrence and flowering phenology. The presence of three potentially rodent-pollinated Protea species at Fernkloof Nature Reserve, two …
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Comparative water relations of indigenous and invasive Australian Proteaceae in fynbos
Water-use efficiency (WUE) as reflected in the leaf carbon stable isotope ratio was compared between co-occurring indigenous fynbos proteoids and invasive Australian hakeas H. sericea, H. gibbosa and H. suaveolens. At the driest site, H. suaveolens was slightly more WUE than several co-occurring …
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Genetic diversity and interspecific relationships in Banksia L.f., (Proteaceae) / Tina Louise Maguire.
… are sister genera in the tribe Banksiae, family Proteaceae.
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Breeding systems and pistil structure in the family proteaceae / Merran Lisa Matthews.
… understanding of breeding systems in Australian Proteaceae and to study the optimum requirements for promotion of seed germination in two lesser researched genera with horticultural potential, Dryandra quercifolia and Dryandra formosa. The timing and pattern of stigma receptivity was determined …
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Branch junction constriction and hydraulic limitation in two species in the Cape Proteaceae : a mechanism explaining the trade-off between longevity and degree of ramification in the Cape Proteaceae
… increased ramification in species of the Cape Proteaceae. This was done by establishing if branch nodes are regions of greater resistance to xylem sap flow in the study species; attempting to quantify nodal resistance for a plant as a whole; and by determining if there is any evidence for …
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A long-term record of the physiological plasticity of stomatal condactance in Proteaceae
Bioclimatic models suggest that Protea species are likely to be severely affected by predicted increases in temperature and reductions in rainfall in the Western Cape. However, throughout their 400 million year history, land plants have been exposed to considerable climatic variations that have …
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The secretion of acid phosphatase by proteaceae as an adaptation to limited phosphate availability
The Proteaceae are a distinctive component of South Africa’s Fynbos and Australia’s Kwongan vegetation and display a number of adaptations to the soils of these nutrientpoor regions, where availability of phosphate (P) is particularly limited. The Proteaceae are notable for the virtually …
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Population genetics of South African Protea L. (Proteaceae) species associated with various pollinator guilds
South Africa hosts plant species with a large variety of floral traits associated with different pollinator guilds. Suites of specialised floral traits associated with particular pollinators are known as pollination systems or syndromes. However, it is often uncertain how these pollination systems …
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Ecological correlates of rare Cape Proteaceae, South Africa, and the implications for their conservation
This thesis examines the ecology of rare Proteaceae of the Fynbos Biome. South Africa. The aim was to determine whether there are any unifying ecological parameters which might be significant for their conservation. The current status of all Cape Proteaceae was initially assessed. A total of 124 …
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In defence of flowers: The ecology and biochemistry of a chemical defence, cyanogenesis, in Proteaceae
… patterns in floral chemical defence in the Proteaceae, a dominant plant family in Australia characterised by diverse floral traits and a high frequency of floral cyanogenesis - a constitutive nitrogen-based chemical defence involving the release of toxic hydrogen cyanide from endogenous …
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Crypsis in non-flying mammal pollinated Proteaceae: novel adaptations and evidence of nectarivorous bird avoidance
… the canopy. A number of species in the Cape Proteaceae are NMP, two of which were chosen as focal species for this study: Protea amplexicaulis and Protea humiflora. This study investigated the two previously suggested hypotheses for crypsis: hidden flowers are more difficult for nectarivorous …
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Does pubescence increase uptake of nutrient deposition on leaves?
… with sparse leaf hair cover, such as in the Cape Proteaceae species of the Cape Floristic Region (CFR), remain unknown. 2. We postulated that leaf hairs of the Proteaceae in the CFR facilitate both nutrient absorption and water retention on the leaf surface. Leaf hair distribution is expected to …
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Aspects of the evolutionary biology of the proteaceae, with emphasis on the genus Leucadendron and its phylogeny
This thesis has been written up as a series of stand alone chapters, in the form that they have, or are to be, submitted for publication. Therefore there is a degree of repetition. Because the scale of my investigation has been fairly broad and crude, and because the genus is so large, I have …
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Occult moisture inputs in the fynbos : Foliar moisure uptake in Ericaceae, Restionaceae and Proteaceae / Annabelle J. Rogers
… their leaf surfaces, while members of the Proteaceae were unable to do so (Gibson, 2012). Adding to the body of research, this study explores whether foliar uptake occurs in species that do not exist in the cloud belt of the Cape Peninsula and the relative importance of this method of …
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