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Cumulative net effects that ageing into the mating pool, adult death and net migration (immigration–emigration) have on the ASR (proportion of males in the adult population defined as men aged 16–45 and women aged 14–36) in two groups of Savannah Pumé hunter–gatherers. Shown for (a) Yaguri and (b) Doro Aná over the 25-year period.
