Optimizing offspring: the quantity–quality tradeoff in agropastoral Kipsigis

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Trade-offs in modern parenting: a longitudinal study of sibling competition for parental care (2009, background): “Most of this research has focused on documenting trade-off effects between fertility and offspring outcomes such as early life mortality (Penn & Smith, 2007; Strassmann & Gillespie, 2002; Voland & Dunbar, 1995), anthropometric measures (Desai, 1995; Hagen, Barrett & Price, 2006; Hagen, Hames, Craig,”
An Evolutionary and Ecological Analysis of Human Fertility, Mating Patterns, and Parental Investment (2003, background): “In other words, male pastoralists may pit quality against quantity of children to preserve a lineage status and resource base rather than simply maximizing the number of descendents (Borgerhoff Mulder, 2000; Mace, 2000).”
Sense and Nonsense: Evolutionary perspectives on human behaviour (2002, methodology): “Using data from 111 studies of IQ which were collected together by Bouchard and McGue (1981), they found that, for the models to give a good fit to all of the data, they had to include a parameter that represented the degree to which identical twins experience a more similar environment than fratern”
Evolutionary Foraging Models in Zooarchaeological Analysis: Recent Applications and Future Challenges (2007, background): “Borgerhoff Mulder, M. (2000).”