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Browsing by Author "Verboom, George Anthony"

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A report on the invasive status of Pinus patula on Mount Mulanje, Malawi

Author: Verboom, George Anthony Date: 1992 Read more
An alternative hypothesis for explaining anomalies in the fine scale distribution patterns of Colophospermum mopane : Are shrub and tree forms genetically distinct ?

Author: Hempson, Gareth Date: 2004 Abiotic and top down control hypotheses do not adequately explain the fine scale distribution patterns of shrub and tree Colophospermum mopane (Caesalpinioideae). Genetic distinctiveness between growth forms is investigated as an alternative ... Read more
Biogeography of Isolepis subgenus Fluitantes (C.B. Clarke), Muasya (Cyperaceae): niche conservatism, long distance dispersal and hybridization

Author: Viljoen, Jan-Adriaan Date: 2010 Numerous lineages of the Western Cape of South Africa show affinities with the flora of tropical Africa and with Australasia. Recent work suggests that most migrations between the Western Cape and tropical Africa occur in a northward direction, ... Read more
Dispersal, gene flow, niche divergence and local adaptation in the hyper-diverse ruschioid Aizoaceae: testing alternative modes of speciation in the Knersvlakte quartz field flora of the Succulent Karoo, South Africa

Author: Musker, Seth Date: 2017 What are the roles of alternative modes of speciation in the generation of biological diversity? This question is fundamental to the debate surrounding the origins of extraordinarily diverse regions and clades. Diversification in the Cape ... Read more
Distribution quantitative morphological variation and preliminary molecular analysis of different growth forms of wild rooibos (Aspalathus linearis) in the northern Cederberg and on the Bokkeveld Plateau

Author: Malgas, R R ; Potts, A J ; Oettlé, N M ; Todd, Simon Wallace ; Verboom, George Anthony ; Hoffman, M T Date: 2010 Aspalathus linearis (Fabaceae) is endemic to the Cape Floristic Region in the Western Cape and Northern Cape Provinces of South Africa. The reddish leaves and stems, primarily of one cultivar, are used to make a commercially important tea ... Read more
Distribution of leaf dissection and sclerophylly along microhabitat gradients in pteridophytes of the Cape peninsula

Author: Viljoen, Jan-Adriaan Date: 2010 Plant species with small leaves and sclerophylls have been reported to occur mainly on dry, low-nutrient soils in situations of high insolation. However; a number of physiological functions have been proposed for the two sets of traits. Ferns ... Read more
Ecological differentiation and the evolution and maintenance of fynbos diversity

Author: Slingsby, Jasper Date: 2011 Preserving the structure and functioning of ecosystems and the benefits they provide to society depends on our understanding of how biodiversity influences ecosystem function and which processes determine the composition and diversity of ... Read more
Ecological influences in the biogeography of the Austral sedges

Author: Viljoen, Jan-Adriaan Date: 2016 The biogeographic history of a species is a result of both stochastic processes such as dispersal and habitat filters that determine where a population with a given set of biological requirements can become established. In this dissertation, ... Read more
The evolution of annuality in association with a shift to more arid environments in the daisy genera Ifloga and Tricogyne

Author: Trisos, Christopher Date: 2007 An annual life history is often viewed as a model adaptation to arid environments. Annuality is predicted to have evolved in response to low adult survival and high seedling survival. In this study I evaluated the idea that increases in aridity ... Read more
The evolution of the Afrotemperate-endemic genus Macowania (Asteraceae) in the Drakensberg region of South Africa

Author: Bentley, Joanne Date: 2010 The cosmopolitan Asteraceae tribe Gnaphalieae, or paper daisies or everlastings, form a significant component of both the dry and cool temperate floras of southern Africa. Within this tribe exists a small Afrotemperate genus, Macowania, endemic ... Read more
Examining patterns of coexistence in the Cape genus Tetraria (Cyperaceae) from a phylogenetic perspective : tracing the history of community assembly processes

Author: Slingsby, Jasper Date: 2004 The coexistence of species is fundamentally important in maintaining high species diversity in a defined area, and is partly responsible for the remarkable diversity of the Cape Floristic Region. The ecological attributes that determine the ... Read more
Functional role of plant water fluxes in nutrient acquisition

Author: Matimati, Ignatious Date: 2014 Transpiration is inevitable during photosynthesis; however, it may also function to cool leaves, transport nutrients and drive nutrient acquisition via mass-flow. In addition to transpiration, plants water fluxes occur through hydraulic ... Read more
Further studies with Melianthus L. : a molecular phylogeny, evolutionary patterns of diversification in the genus and pollinator syndromes

Author: Henning, Jack Date: 2003 A phylogeny was produced for the eight taxa comprising the largely South African genus Melianthus L. based on two plastid markers (trnL-F and psbA-trnH) and one nuclear marker (ITS). Topological comparisons with a tree based on an existing ... Read more
Investigating the functional and adaptive significance of leaf size and shape variation in Jamesbrittenia (Scrophulariaceae (s.s). tribe Manulae) : an experimental and comparative approach

Author: Moore, Timothy E Date: 2007 The adaptive significance of variety in leaf forms remains a mystery for many plant groups. This study aimed, using a combined experimental and comparative approach, to investigate the functional significance of leaf size and shape variation, ... Read more
An investigation of character variation in Chaetobromus Nees (Danthonieae: Poaceae) in relation to taxonomic and ecological pattern

Author: Verboom, George Anthony Date: 1995 Character variation in Chaetobromus, a genus of palatable grasses endemic to the arid western areas of southern Africa, was used to derive a classification reflecting taxonomic and ecological pattern. The present study differs from earlier ... Read more
Molecular phylogeny of Tribolium (Danthonioideae: Poaceae) and its taxonomic implications

Author: Ntsohi, Refiloe Date: 2003 Molecular sequence data from two noncoding regions of DNA (ITS AND TRNL-F) were used to produce a phylogeny for the genus Tribolium and its African and Australasian allies. Topological comparisons of the combined molecular data with the ... Read more
Morphological and molecular analyses for the characterization of Aspalanthus linearis (Fabaceae: rooibos)

Author: Potts, Alistair Date: 2006 I investigated the infraspecific diversity among individuals of Aspalathus linearis from five localities in the Cederberg Fynbos region using morphological traits and two DNA- based methods: inter-simple sequence repeats (ISSR) and a plastid ... Read more
The origins and maintenance of species boundaries in Jamesbrittenia O. Kuntze (Scrophulariaceae: Manuleae)

Author: Moncrieff, Glenn Date: 2007 The genus Jamesbrittenia contains 83 species distributed throughout southern Africa. Many species produce attractive flowers and consequently their horticultural potential is currently being explored. Speciation patterns and reproductive ... Read more
Ovular features of African arundinoid grasses.

Author: Verboom, George Anthony Date: 07 Nov 2017 Read more
Phylogenetic and functional growth from diversification in the Cape grass genus Ehrharta Thunb

Author: Verboom, George Anthony Date: 2000 This thesis uses phylogenetic and comparative data to test an hypothesis of adaptive radiation in the Cape grass genus Ehrharta Thunb. sensu stricto. Morphological data and sequence data from two noncoding regions of DNA (lTS1 and trnL-F) are ... Read more

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