A study of blood donor motivation in South Africa

This chapter looks at a study of blood donor motivation in South Africa, which was commissioned by the Natal Blood Transfusion Service and carried out in Durban. Much of the fieldwork was done by six trained Bantu graduates which helps to explain the perceptive nature of some of the interview data elicited from poor and semi-literate Bantu workers. The study shows that the Bantu donor is statistically rare. They come mainly from institutional groups such as factories and schools and tend to be younger, better educated, and with higher incomes than the average Bantu adult in Durban. The concepts of blood held by the average manual worker Bantu closely link blood with health and are unfavourable to blood donation. Moreover, in the Bantu population at large there is widespread ignorance about, and fear of, blood donation. A marked characteristic of the Bantu blood donors is that they tend to give blood only once or twice.

Social complexity and linguistic diversity in the Austronesian and Bantu population expansions

Reconstructing the rise and fall of social complexity in human societies through time is fundamental for understanding some of the most important transformations in human history. Phylogenetic methods based on language diversity provide a means to reconstruct pre-historic events and model the transition rates of cultural change through time. We model and compare the evolution of social complexity in Austronesian ( n = 88) and Bantu ( n = 89) societies, two of the world's largest language families with societies representing a wide spectrum of social complexity. Our results show that in both language families, social complexity tends to build and decline in an incremental fashion, while the Austronesian phylogeny provides evidence for additional severe demographic bottlenecks. We suggest that the greater linguistic diversity of the Austronesian language family than Bantu likely follows the different biogeographic structure of the two regions. Cultural evolution in both the Bantu and Austronesian cases was not a simple linear process, but more of a wave-like process closely tied to the demography of expanding populations and the spatial structure of the colonized regions.