3. Electronic Theses and Dissertations (ETDs) - All submissions
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Item Archaeology and visuality, imaging as recording: a pictorial genealogy of rock painting research in the Maloti-Drakensberg through two case studies(2012-08-31) Wintjes, JustinePictorial copies play an essential role in the creation of rock art knowledge, forming a bridge between the art and theories of interpretation. My thesis traces a ‘pictoriography’, that is, a historiography of the practice of recording rock paintings in pictures. I begin with the earliest examples dotting the shifting edges of the Cape Colony from the mideighteenth to mid-nineteenth centuries. Thereafter, the focus shifts to the Maloti-Drakensberg, where two case studies bring this disciplinary history into more recent times. The first is the rainmaking group from Sehonghong Shelter (Lesotho). One of the first rock paintings to be published, it became one of the most iconic in southern Africa. I relate its various copies to one another and to wider views of Sehonghong, revealing how it has been decontextualized and reproduced in diagrammatic form. I develop a ‘digital restoration’, whereby copies circulating independently in the world are returned in digital images to their place of origin. I develop this process further in a site-wide study of eBusingatha Shelter (AmaZizi Traditional Authority Area, KwaZulu-Natal Drakensberg). Once an impressive painted gallery, eBusingatha has been severely damaged by vandalism, removals and collapse, while documents tracking its demise accumulated elsewhere. I reunite scattered records, enabling copies to be contextualized and lost visual qualities of the originals to be restored. Throughout these pictorial genealogies, I explore the distance between the way the rock paintings are illustrated and the way they actually look. While recording strategies are diverse, one dominant convention has emerged in recent decades. Meticulous tracings converted into monochrome redrawings effect a translation of complex and ambiguous painted occurrences into clean forms ‘peeled’ from the rock and projected like shadows onto paper. The are more like text than picture. Colour for instance is considered an integral part of painting traditions worldwide, yet is expunged from the study of San rock paintings. A reintegration of such pictorial attributes into their study may encourage a return to the material world of the imagery and a contextualization of the semantics of its symbolic constituents.Item The use of AFLP to determine if a slimes-tolerant indigenous species shows local adaptation to slimes dam soils(2006-11-15T09:05:05Z) Angus, Caroline JanePlant populations show an ability to survive and adapt under varying environmental conditions. Adaptation to heavy metal contaminated soils usually results in a decrease in genetic variation. Slimes dams consist of the pulverized rock slurry left after the extraction of gold or uranium. High toxicity levels mean that these wastes often remain uncolonised and are therefore easily eroded through wind or water. Plant populations that will be viable for long-term vegetation of slimes dams will prevent erosion, and stabilise and improve the quality of the soil. Indigenous, locally adapted species are the most likely to be successful candidates for vegetation. Indigenous, slimes-tolerant species Indigofera adenoides and Indigofera zeyheri were therefore studied. The aim was to determine if plant populations show local adaptation to the adverse substrate conditions emanating from slimes dams, by investigating genetic and morphological variation between adjacent populations growing at different distances in relation to slimes dams. The AFLP technique was used to analyse genetic variation as it produces rapid results, is inexpensive, reproducible, and capable of screening the entire genome. Lower genetic diversity was observed in those areas of the dams with higher levels of slimes-associated contamination. This difference was observed in both species, and for all measures of genetic diversity (Shannon’s information index, Nei’s gene diversity, percentage of loci polymorphic). This may be due to a founder effect following colonisation, natural selection, flowering time differences, or a combination of these factors. Reduced morphological variation was observed in those areas of the dams with higher levels of slimes-associated contamination. Significant morphological differences were observed between groups of plants from different areas, some of which appear to have the capability to assist the plants in a slimes-contaminated environment. Some degree of adaptation to slimes-contaminated soil therefore seems to have occurred, with this being more pronounced in Indigofera adenoides, although it cannot be determined whether this is purely phenotypic, or a combination of phenotypic and genetic. These species therefore seem suitable as candidates for vegetation of slimes dams, although further work must be done to fully understand the effect of slimes-associated toxicity.