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Reproductive trade-offs in extant hunter-gatherers suggest adaptive mechanism for the Neolithic expansion

From Complex Time
Category
General Reference
author-supplied keywords
keywords
authors
Abigail E. Page
Sylvain Viguier
Mark Dyble
Daniel Smith
Nikhil Chaudhary
Gul Deniz Salali
James Thompson
Lucio Vinicius
Ruth Mace
Andrea Bamberg Migliano
title
Reproductive trade-offs in extant hunter-gatherers suggest adaptive mechanism for the Neolithic expansion
type
journal
year
2016
source
Proceedings of the National Academy of Sciences
pages
4694-4699
volume
113
issue
17
publisher
Proceedings of the National Academy of Sciences
link
http://www.mendeley.com/research/reproductive-tradeoffs-extant-huntergatherers-suggest-adaptive-mechanism-neolithic-expansion-1(0)

Abstract

The Neolithic demographic transition remains a paradox, because it is associated with both higher rates of population growth and increased morbidity and mortality rates. Here we reconcile the conflicting evidence by proposing that the spread of agriculture involved a life history quality–quantity trade-off whereby mothers traded offspring survival for increased fertility, achieving greater reproductive success despite deteriorating health. We test this hypothesis by investigating fertility, mortality, health, and overall reproductive success in Agta hunter-gatherers whose camps exhibit variable levels of sedentarization, mobility, and involvement in agricultural activities. We conducted blood composition tests in 345 Agta and found that viral and helminthic infections as well as child mortality rates were significantly increased with sedentarization. Nonetheless, both age-controlled fertility and overall reproductive success were positively affected by sedentarization and participation in cultivation. Thus, we provide the first empirical evidence, to our knowledge, of an adaptive mechanism in foragers that reconciles the decline in health and child survival with the observed demographic expansion during the Neolithic.

Counts

Citation count From Scopus. Refreshed every 5 days.
17
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3

Identifiers

  • doi: 10.1073/pnas.1524031113 (Google search)
  • issn: 0027-8424
  • scopus: 2-s2.0-84964770231

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