Evidence map›Paper›PMID 27603668›Full record

ArticlePloS one2016

Behavioral Variation in Gorillas: Evidence of Potential Cultural Traits.

Martha M Robbins, Chieko Ando, Katherine A Fawcett, Cyril C Grueter, Daniela Hedwig, Yuji Iwata, Jessica L Lodwick, Shelly Masi, Roberta Salmi, Tara S Stoinski and 3 more

Abstract read
In one paragraph

Article in PloS one, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 33 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
33citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

33 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Article
  3. Brokering peace in the ape (culture) wars.Evolutionary human sciences · 2026
    Article
  4. Article
  5. Article
  6. Animal culture: conservation in a changing world.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025
    Article
  7. Integrating culture into primate conservation.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025
    Review
  8. Article
  9. Review
  10. Article
  11. Article
  12. Article
  13. Article
  14. Reflections on connections.Primates; journal of primatology · 2023
    Article
  15. Association patterns of female gorillas.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2023
    Article
  16. Article
  17. Sociality predicts orangutan vocal phenotype.Nature ecology & evolution · 2022
    Article
  18. The origins of human cumulative culture: from the foraging niche to collective intelligence.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2022
    Article
  19. Review
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

13 authors.

Martha M RobbinsMax Planck Institute for Evolutionary Anthropology, Leipzig, Germany.
Chieko AndoKyoto Prefectural University, Graduate School of Life and Environmental Sciences, Kyoto, Japan.
Katherine A FawcettDian Fossey Gorilla Fund International, Atlanta, GA, United States of America.
Cyril C GrueterMax Planck Institute for Evolutionary Anthropology, Leipzig, Germany.
Daniela HedwigMax Planck Institute for Evolutionary Anthropology, Leipzig, Germany.
Yuji IwataKyoto Prefectural University, Graduate School of Life and Environmental Sciences, Kyoto, Japan.
Jessica L LodwickInterdepartmental Doctoral Program in Anthropological Sciences, Stony Brook University, Stony Brook, New York, United States of America.
Shelly MasiMuséum National d¹Histoire Naturelle, Musée de l'Homme, National Center for Scientific Research (CNRS), University Paris Diderot (Paris 7) Éco-anthropologie et Ethnobiologie, Paris, France.
Roberta SalmiDepartment of Anthropology, University of Georgia, Athens, GA, United States of America.
Tara S StoinskiDian Fossey Gorilla Fund International, Atlanta, GA, United States of America.
Angelique ToddWorld Wildlife Fund-CAR, Bangui, Central African Republic.
Veronica VercellioDian Fossey Gorilla Fund International, Atlanta, GA, United States of America.
Juichi YamagiwaKyoto University, Graduate School of Sciences, Kyoto, Japan.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The question of whether any species except humans exhibits culture has generated much debate, partially due to the difficulty of providing conclusive evidence from observational studies in the wild. A starting point for demonstrating the existence of culture that has been used for many species including chimpanzees and orangutans is to show that there is geographic variation in the occurrence of particular behavioral traits inferred to be a result of social learning and not ecological or genetic influences. Gorillas live in a wide variety of habitats across Africa and they exhibit flexibility in diet, behavior, and social structure. Here we apply the 'method of exclusion' to look for the presence/absence of behaviors that could be considered potential cultural traits in well-habituated groups from five study sites of the two species of gorillas. Of the 41 behaviors considered, 23 met the criteria of potential cultural traits, of which one was foraging related, nine were environment related, seven involved social interactions, five were gestures, and one was communication related. There was a strong positive correlation between behavioral dissimilarity and geographic distance among gorilla study sites. Roughly half of all variation in potential cultural traits was intraspecific differences (i.e. variability among sites within a species) and the other 50% of potential cultural traits were differences between western and eastern gorillas. Further research is needed to investigate if the occurrence of these traits is influenced by social learning. These findings emphasize the importance of investigating cultural traits in African apes and other species to shed light on the origin of human culture.

Indexed as

CultureSocial BehaviorAfricaAnimalsEcologyFeeding BehaviorFemaleGorilla gorillaInterpersonal RelationsPan troglodytesPhenotypePongoPongo pygmaeus

Identifiers

PMID27603668
PMCPMC5014408

What OpenQuestion holds

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Read underepoch 390

Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.