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Travel linearity and speed of human foragers and chimpanzees during their daily search for food in tropical rainforests

Jang, Haneul, Boesch, Christophe, Mundry, Roger, Ban, Simone D., Janmaat, Karline R. L.·2019·Scientific Reports
DOI 10.1038/s41598-019-47247-9PMC PMC6667462
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Abstract

To understand the evolutionary roots of human spatial cognition, researchers have compared spatial abilities of humans and one of our closest living relatives, the chimpanzee (Pan troglodytes). However, how humans and chimpanzees compare in solving spatial tasks during real-world foraging is unclear to date, as measuring such spatial abilities in natural habitats is challenging. Here we compared spatial movement patterns of the Mbendjele BaYaka people and the Taï chimpanzees during their daily search for food in rainforests. We measured linearity and speed during off-trail travels toward out-of-sight locations as proxies for spatial knowledge. We found similarly high levels of linearity in individuals of Mbendjele foragers and Taï chimpanzees. However, human foragers and chimpanzees clearly differed in their reactions to group size and familiarity with the foraging areas. Mbendjele foragers increased travel linearity with increasing familiarity and group size, without obvious changes in speed. This pattern was reversed in Taï chimpanzees. We suggest that these differences between Mbendjele foragers and Taï chimpanzees reflect their different ranging styles, such as life-time range size and trail use. This result highlights the impact of socio-ecological settings on comparing spatial movement patterns. Our study provides a first step toward comparing long-range spatial movement patterns of two closely-related species in their natural environments.

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  • Trails may also aid patrolling behaviour in territorial species, although a study of Tai chimpanzees found that they rarely use paths, including while on patrols.

    “Trails may also aid patrolling behaviour in territorial species (Cusack et al., 2015), although a study of Tai chimpanzees found that they rarely use paths, including while on patrols (Jang, Boesch, Mundry, Ban, & Janmaat, 2019).”

    From Forest terrains influence walking kinematics among indigenous Tsimane of the Bolivian Amazon (2022) · cites this paper as Jang et al., 2019

  • Similar observations have been made for the Mbendjele hunter-gatherers, also of the Congo Rainforest.

    “Similar observations have been made for the Mbendjele hunter–gatherers, also of the Congo Rainforest (Jang et al., 2019).”

    From Forest terrains influence walking kinematics among indigenous Tsimane of the Bolivian Amazon (2022) · cites this paper as Jang et al., 2019

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Metadata

Authors
Jang, H., Boesch, C., Mundry, R., Ban, S. D., & Janmaat, K. R. L.
Venue
Scientific Reports
Publisher
Springer Science and Business Media LLC
Published
2019-07-30
Volume
9
Issue
1
ISSN
2045-2322
DOI
10.1038/s41598-019-47247-9
PMC
PMC6667462
Cited by
52
References
6
Language
en
Licence
Funders
  • Max-Planck-Institut für Evolutionäre Anthropologie
  • Leakey Foundation

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