Diet and subsistence patterns in the later iron age of South Africa : an analysis of stable carbon and nitrogen isotopes and the incidence of dental caries
Master Thesis
1995
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University of Cape Town
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Abstract
Current archaeological perspectives on the change in Later Iron Age diet and subsistence patterns and the subsequent affect on the economy, are re-examined using isotopic and caries analyses. Existing perspectives have focused mainly on material archaeological evidence and are not reflective of diet at the individual level. Consequently, the focus of archaeological research has been biased towards the importance of cattle in subsistence patterns and the economy, and the role of agriculture has not been as thoroughly investigated. In order to address this problem the isotopic signatures of 72skeletal remains, and the pattern of carious lesions of 44 of those individuals, were examined. The samples were drawn from different ethnic groups and geographical/climatic regions. Skeletons were analysed for both ᵟ¹³C and ᵟ¹⁵ N values in order to better reflect both the level of cultigen consumption and the relative importance of animal protein in the diet. The results were initially examined at an individual level, within the biomes from which they were drawn, to determine subsistence type. The diets of persons and ethnic groups was then compared to archaeological and ethnographical research. Combination of results demonstrates a trend towards more enriched ᵟ¹³C values over time. Although there were differences between individuals diets, there is an overall increasing consumption (and therefore reliance) on domesticated grains, whilst the consumptive levels of animal protein remain relatively constant over the last 1000 years. Consequently, the context of previously undated skeletal material was founded on the trend towards increasing ᵟ¹³C values during the second millennium. The creation of a set of criteria based on pattern, type and extent on carious lesions, has provided a further means of assessing the carbohydrate intake level of individuals. An increase in both ᵟ¹³C values and the incidence of caries during the 18th century, may reflect the introduction of maize in the interior of South Africa, via Delagoa Bay. It is suggested that population growth and increased demand resulted in maize replacing indigenous African cultigens to become a staple food source after this period. In conclusion it is postulated that further re-examination of the current outlook should be undertaken as it is clear from this study that the Later Iron Age is heterogenous with comparable but distinct dietary levels.
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Bibliography: pages 103-116.
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Gilbert, C. 1995. Diet and subsistence patterns in the later iron age of South Africa : an analysis of stable carbon and nitrogen isotopes and the incidence of dental caries. University of Cape Town.