Reproductive state and rank influence patterns of meat consumption in wild female chimpanzees (Pan troglodytes schweinfurthii)

Robert C. O'Malley, Margaret A. Stanton, Ian Gilby, Elizabeth V. Lonsdorf, Anne Pusey, A. Catherine Markham, Carson M. Murray

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

An increase in faunivory is a consistent component of human evolutionary models. Animal matter is energy- and nutrient-dense and can provide macronutrients, minerals, and vitamins that are limited or absent in plant foods. For female humans and other omnivorous primates, faunivory may be of particular importance during the costly periods of pregnancy and early lactation. Yet, because animal prey is often monopolizable, access to fauna among group-living primates may be mediated by social factors such as rank. Wild chimpanzees (Pan troglodytes) across Africa habitually consume insects and/or vertebrates. However, no published studies have examined patterns of female chimpanzee faunivory during pregnancy and early lactation relative to non-reproductive periods, or by females of different rank. In this study, we assessed the influence of reproductive state and dominance rank on the consumption of fauna (meat and insects) by female chimpanzees of Gombe National Park, Tanzania. Using observational data collected over 38 years, we tested (a) whether faunivory varied by reproductive state, and (b) if high-ranking females spent more time consuming fauna than lower-ranking females. In single-factor models, pregnant females consumed more meat than lactating and baseline (meaning not pregnant and not in early lactation) females, and high-ranking females consumed more meat than lower-ranking females. A two-factor analysis of a subset of well-sampled females identified an interaction between rank and reproductive state: lower-ranking females consumed more meat during pregnancy than lower-ranking lactating and baseline females did. High-ranking females did not significantly differ in meat consumption between reproductive states. We found no relationships between rank or reproductive state with insectivory. We conclude that, unlike insectivory, meat consumption by female chimpanzees is mediated by both reproductive state and social rank. We outline possible mechanisms for these patterns, relate our findings to meat-eating patterns in women from well-studied hunter-gatherer societies, and discuss potential avenues for future research.

Original languageEnglish (US)
Pages (from-to)16-28
Number of pages13
JournalJournal of Human Evolution
Volume90
DOIs
StatePublished - Jan 1 2016

Fingerprint

meat consumption
Pan troglodytes
meat
ranking
pregnancy
lactation
animal
insectivory
early lactation
insectivores
national park
consumption
Meat Consumption
Chimpanzee
fauna
Tanzania
eating behavior
social factors
primate
factor analysis

Keywords

  • Diet
  • Dominance rank
  • Faunivory
  • Insectivory
  • Meat
  • Reproduction

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Arts and Humanities (miscellaneous)
  • Education

Cite this

Reproductive state and rank influence patterns of meat consumption in wild female chimpanzees (Pan troglodytes schweinfurthii). / O'Malley, Robert C.; Stanton, Margaret A.; Gilby, Ian; Lonsdorf, Elizabeth V.; Pusey, Anne; Markham, A. Catherine; Murray, Carson M.

In: Journal of Human Evolution, Vol. 90, 01.01.2016, p. 16-28.

Research output: Contribution to journalArticle

O'Malley, Robert C. ; Stanton, Margaret A. ; Gilby, Ian ; Lonsdorf, Elizabeth V. ; Pusey, Anne ; Markham, A. Catherine ; Murray, Carson M. / Reproductive state and rank influence patterns of meat consumption in wild female chimpanzees (Pan troglodytes schweinfurthii). In: Journal of Human Evolution. 2016 ; Vol. 90. pp. 16-28.
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