Iron Age farmers in southwestern Zambia: some aspects of spatial organization

Examination of the spatial organization of prehistoric farming hamlets in southwestern Zambia permits certain suggestions about the structure of prehistoric economic and social practice. Slash-and-burn agriculture facilitated the movement of farmers into favoured microenvironments. Its extensive land requirements regulated population growth and encouraged territorial expansion. After the ninth century AD, a cyclical use of agricultural opportunities was instituted. Through this time, social constraints concentrated the dispersed population within single microenvironments. Subsequent adaptation to the simultaneous use of diverse microenvironments was supported by the expansion of herding activities and the role of cattle in maintaining socio-political prestige.

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Résumé L'étude de l'organisation spatiale des hameaux agricoles préhistoriques du Sud-Ouest de la Zambie nous permet d'avancer certaines suggestions au sujet de la structure des pratiques économiques et sociales pendant la préhistoire. La culture sur brûlis de forêt a facilité la déplacement des agriculteurs vers des microenvironnements Préférés—et comme ces défrichements utilisaient beaucoup de terrain, ils ont réglé la croissance démographique, et ont encouragé l'expansion territoriale. Après le neuvième siècle après J.C., une utilisation cyclique des possibilités agricoles s'est établie. Pendant cette période des contraintes sociales ont concentré la population dispersée dans des microenvironnements particuliers. L'adaptation plus tard à l'utilisation simultanée de microenvironnements divers était soutenue par l'expansion de l'élevage et par le rôle du bétail dans le maintien du prestige socio-politique.

     

Stable Isotope Analysis Reveals Variations in Human Diet at the Poundbury Camp Cemetery Site

Stable isotope analysis was undertaken on 48 individuals from Iron Age, Roman and Post-Roman periods of the Poundbury Camp Cemetery, Dorchester, England. Variations in diet, reflected by the stable isotope values, were observed between individuals from the different time periods. Differences in diet within the Late Roman period were particularly interesting, as we found that the isotope values could be related to burial type. We also found evidence of possible immigrants at Poundbury; individuals that may have come to the site from a warmer climate.     

Geographic information system‐based evaluation of spatial accessibility to maternal health facilities in Siaya County,Kenya

Maternal mortality is a major problem in middle‐income and low‐income countries, and the availability and accessibility of healthcare facilities offering safe delivery is important in averting maternal deaths. Siaya County, in Kenya, has one of the highest maternal mortality rates in the country—far more than the national average. This study aimed to evaluate geographic access to health facilities offering delivery services in Siaya County. A mixed‐methods approach incorporating geographic information system analysis and individual data from semi‐structured interviews was used to derive travel time maps to facilities using different travel scenarios: AccessMod5 and ArcGIS were used for these tasks. The derived maps were then linked to georeferenced household survey data in a multilevel logistic regression model in R to predict the probability of expectant women delivering in a health facility. Based on the derived travel times, 26 per cent (13,140) and 67 per cent (32,074) of the estimated 46,332 pregnant women could reach any facility within one and two hours, respectively, while walking with the percentage falling to seven per cent (3,415) and 20 per cent (8,845) when considering referral facilities. Motorised transport significantly increased coverage. The findings revealed that the predicted probability of a pregnant woman delivering in a health facility ranged between 0.14 and 0.86. Significant differences existed in access levels with transportation‐based interventions significantly increasing coverage. The derived maps can help health policy planners identify underserved areas and monitor future reductions in inequalities. This work has theoretical implications for conceptualising healthcare accessibility besides advancing the literature on mixed methodologies.