Population studies,Reproductive Behavior and family composition: Some theoretical considerations

Human populations are characterized by their heterogeneity, as much cultural as biological. This is why they can but the considered as complex entities. On the one side, this means going beyond the typological approach of traditional physical anthropology and thinking in terms of evolutionary processes, that is to say, population reproduction. On the other side, this implies developing an integrated view which takes into account as much cultural processes as demographic, socio-economic or biological ones. This paper aims to show, in this regard, the pertinence of taking the family as the unit of analysis. Yet, it is not enough to consider family structure, i.e. the composition of the domestic group, but one needs to understand the kinship system on which it is based and its dynamics. This is done by examining the different stages through which the family goes along its life cycle. We close these theoretical considerations by briefly illustrating them with our data on fertility and household composition in two different populations from the Altos de Chiapas in Mexico.