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Hunter-gatherer residential mobility and the marginal value of rainforest patches

Proceedings of the National Academy of Sciences - PNAS, 2017-03, Vol.114 (12), p.3097-3102 [Peer Reviewed Journal]

Volumes 1–89 and 106–114, copyright as a collective work only; author(s) retains copyright to individual articles ;Copyright National Academy of Sciences Mar 21, 2017 ;ISSN: 0027-8424 ;EISSN: 1091-6490 ;DOI: 10.1073/pnas.1617542114 ;PMID: 28265058

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  • Title:
    Hunter-gatherer residential mobility and the marginal value of rainforest patches
  • Author: Venkataraman, Vivek V. ; Kraft, Thomas S. ; Dominy, Nathaniel J. ; Endicott, Kirk M.
  • Subjects: Biological Sciences ; Foraging behavior ; Hunter-gatherers ; Mobility ; Rainforests ; Theorems
  • Is Part Of: Proceedings of the National Academy of Sciences - PNAS, 2017-03, Vol.114 (12), p.3097-3102
  • Description: The residential mobility patterns of modern hunter-gatherers broadly reflect local resource availability, but the proximate ecological and social forces that determine the timing of camp movements are poorly known. We tested the hypothesis that the timing of such moves maximizes foraging efficiency as hunter-gatherers move across the landscape. The marginal value theorem predicts when a group should depart a camp and its associated foraging area and move to another based on declining marginal return rates. This influential model has yet to be directly applied in a population of hunter-gatherers, primarily because the shape of gain curves (cumulative resource acquisition through time) and travel times between patches have been difficult to estimate in ethnographic settings. We tested the predictions of the marginal value theorem in the context of hunter-gatherer residential mobility using historical foraging data from nomadic, socially egalitarian Batek hunter-gatherers (n = 93 d across 11 residential camps) living in the tropical rainforests of Peninsular Malaysia. We characterized the gain functions for all resources acquired by the Batek at daily timescales and examined how patterns of individual foraging related to the emergent property of residential movements. Patterns of camp residence times conformed well with the predictions of the marginal value theorem, indicating that communal perceptions of resource depletion are closely linked to collective movement decisions. Despite (and perhaps because of) a protracted process of deliberation and argument about when to depart camps, Batek residential mobility seems to maximize group-level foraging efficiency.
  • Publisher: United States: National Academy of Sciences
  • Language: English
  • Identifier: ISSN: 0027-8424
    EISSN: 1091-6490
    DOI: 10.1073/pnas.1617542114
    PMID: 28265058
  • Source: PubMed Central (Open access)
    Geneva Foundation Free Medical Journals at publisher websites
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