Primates

, Volume 33, Issue 4, pp 523–544 | Cite as

Functional analysis of social staring behavior in an all-male group of mountain gorillas

  • Juichi Yamagiwa
Article

Abstract

A total 202 social staring episodes (prolonged gazing by one individual toward another within a short distance) were observed in various social contexts among six unrelated, adult, and subadult male mountain gorillas. Staring was not accompanied by distinct facial expressions by actors or recipients, irrespective of their age or dominance rank. Younger, subordinate animals tended to stare at elder, dominant animals more frequently than vice versa. Staring may have multiple functions depending on the social context. In the initiation of non-agonistic interactions, staring rarely occurred, but was very successful for younger males in eliciting play or homosexual interactions from older animals. Staring was also directed by younger males to older males for greeting or appeasement. It may possibly play a role in reducing the increased social tension that occurs during or after conflict and in averting the potential conflict among older males. Younger males occasionally supplanted older males by staring at feeding spots. This slow supplantation is similar to the phenomenon of food sharing achieved through begging behavior in chimpanzees and bonobos. A prolonged gaze including staring by subordinates towards dominants may characterize the frequent and prolonged face-to-face interactions in the African great apes, and contrasts with a frequent gaze aversion by subordinates towards dominants in macaques or baboons. A difference between gorillas and other apes is that, chimpanzees and bonobos make positive contact with each other through eye contact, while gorillas simply stare at another without physical contact in greeting or appeasement process. Staring may serve an effective strategy for younger male gorillas to intervene safely in olders' conflict and sometimes to suppress or inhibit olders' performance, but their non-agonistic contacts or supporting attacks may not contribute to the establishment or support of social bonds between them. It is possible that staring may be common among the African great apes and man, and that it has evolved as a tactics to mask the dominant/subordinate relationships between individuals with multiple functions.

Key Words

Mountain gorillas All-male group Social staring Appeasement Slow supplantation 

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References

  1. Altmann, S. A., 1962. A field study of the sociobiology of rhesus monkeys,Macaca mulatta.Ann. N.Y. Acad. Sci., 102: 338–435.PubMedGoogle Scholar
  2. Bertrand, M., 1969.The Behavioral Repertoire of the Stumptail Macaque, Bibliotheca Primatologica, No. 11. Karger, Basel.Google Scholar
  3. Caro, T. M., 1976. Observations on the ranging behaviour and daily activity of lone silverback mountain gorillas (Gorilla gorilla beringei).Anim. Behav., 24: 889–897.Google Scholar
  4. Chance, M. R. A., 1956. Social structure of a colony ofMacaca mulatta.Brit. J. Anim. Behav., 4: 1–13.Google Scholar
  5. Cheney, D. L., 1977. The acquisition of rank and the development of reciprocal alliances among free-ranging immature baboons.Behav. Ecol. Sociobiol., 2: 303–318.CrossRefGoogle Scholar
  6. Chevalier-Skolnikoff, S., 1974. Male-female, female-female, and male-male sexual behavior in the stumptail monkey, with special attention to the female orgasm.Arc. Sex. Behav., 3(2): 95–116.Google Scholar
  7. Datta, S. B., 1989. Demographic influences on dominance structure among female primates. In:Comparative Socioecology,V. Standen &R. A. Foley (eds.), Blackwell Scientific Publ., Oxford, pp. 265–284.Google Scholar
  8. Dolhinow, P. J. &N. Bishop, 1970. The development of motor skills and social relationships among primates through play.Minn. Symp. Child Psychol., 4: 141–198.Google Scholar
  9. Eibl-Eibesfeldt, I., 1973.Der Vorprogrammierte Mensch. Verlag Fritz Molden, Wien.Google Scholar
  10. Elliott, R. C., 1976. Observation on a small group of mountain gorillas (Gorilla gorilla beringei).Folia Primatol., 25: 12–24.PubMedGoogle Scholar
  11. Enomoto, T., 1974. The sexual behavior of Japanese monkeys.J. Human Evol., 3: 351–372.Google Scholar
  12. Fossey, D., 1972. Vocalization of the mountain gorilla (Gorilla gorilla beringei).Anim. Behav., 20: 36–53.Google Scholar
  13. ————, 1974. Observations on the home range of one group of mountain gorillas (Gorilla gorilla beringei).Anim. Behav., 22: 568–581.CrossRefGoogle Scholar
  14. ————, 1981. The imperiled mountain gorilla.Nat. Geogr., 159: 501–523.Google Scholar
  15. ————, 1982. Reproduction among free-living mountain gorillas.Amer. J. Primatol. Suppl., 1: 97–104.Google Scholar
  16. ————, 1983.Gorillas in the Mist. Houghton Mifflin, Boston.Google Scholar
  17. ———— &A. H. Harcourt, 1977. Feeding ecology of free-ranging mountain gorilla (Gorilla gorilla beringei). In:Primate Ecology: Studies of Feeding and Ranging Behaviour in Lemurs, Monkeys and Apes,T. H. Clutton-Brock (ed.), Academic Press, London, pp. 415–447.Google Scholar
  18. Furuichi, T., 1989. Social interactions and the life history of femalePan paniscus in Wamba, Zaire.Int. J. Primatol., 10: 173–197.Google Scholar
  19. Goodall, J., 1965. Chimpanzees of the Gombe Stream Reserve. In:Primate Behavior,I. DeVore (ed.), Holt, Rinehart, & Winston, New York, pp. 425–473.Google Scholar
  20. ————, 1968. The behaviour of free-living chimpanzees in the Gombe Stream Reserve.Anim. Behav. Monogr., 1(3): 161–311.Google Scholar
  21. Hall, E. T., 1966.The Hidden Dimension. Doubleday, Garden City, New York.Google Scholar
  22. Hall, K. R. L. &I. DeVore, 1965. Baboon social behavior. In:Primate Behavior,I. DeVore (ed.), Holt, Rinehart, & Winston, New York, pp. 53–110.Google Scholar
  23. ———— &B. Mayer, 1967. Social interactions in a group of captive patas monkey (Erythrocebus patas).Folia Primatol., 5: 213–236.PubMedGoogle Scholar
  24. Harcourt, A. H., 1978. Strategies of emigration and transfer by primates, with particular reference to gorillas.Z. Tierpsychol., 48: 401–420.PubMedGoogle Scholar
  25. ————, 1979a. Social relationships among adult female mountain gorillas.Anim. Behav., 27: 251–264.Google Scholar
  26. ————, 1979b. Social relationships between adult male and female mountain gorillas in the wild.Anim. Behav., 27: 325–342.Google Scholar
  27. ———— & K. J. Stewart, 1987. The influence of help in contests on dominance rank in primates: hints from gorillas.Anim. Behav., 35: 182–190.Google Scholar
  28. ———— & ————, 1989. Functions of alliances in contests within wild gorilla groups.Behaviour, 109: 176–190.Google Scholar
  29. ————, ————, &D. Fossey, 1976. Male emigration and female transfer in wild mountain gorilla.Nature, 263: 226–227.CrossRefGoogle Scholar
  30. ————, ————, & ————, 1981. Gorilla reproduction in the wild. In:Reproductive Biology of the Great Apes,E. E. Graham (ed.), Academic Press, New York, pp. 265–279.Google Scholar
  31. Hediger, H., 1955.Studies of the Psychology and Behaviour of Captive Animals in Zoos and Circuses. Criterion Books, New York.Google Scholar
  32. Idani, G., 1991. Relations between unit-groups of bonobos at Wamba, Zaire: encounters and temporary fusions.Afr. Stud. Monogr., 11(3): 153–186.Google Scholar
  33. Itani, J., 1954.Nihon Dobutsuki II, The Japanese Monkeys at Takasakiyama.K. Imanishi (ed.), Kobunsha, Tokyo. (in Japanese).Google Scholar
  34. Kano, T., 1980. Social behavior of wild pygmy chimpanzees (Pan paniscus) of Wamba: a preliminary report.J. Human Evol., 9: 243–260.Google Scholar
  35. Kitamura, K., 1989. Genito-genital contacts in the pygmy chimpanzee (Pan paniscus).Afr. Stud. Monogr., 10(2): 49–67.Google Scholar
  36. Koyama, N., 1985. Playmate relationships among individuals of a Japanese monkey troop in Arashiyama.Primates, 26: 390–406.Google Scholar
  37. Kummer, H., 1967. Tripartite relations in hamadryas baboons. In:Social Communication Among Primates,S. A. Altmann (ed.), Univ. of Chicago Press, Chicago, pp. 63–71.Google Scholar
  38. Kurland, J. A., 1977.Kin Selection in the Japanese Monkey. Contributions to Primatology, Vol. 12, S. Karger, Basel.Google Scholar
  39. Kuroda, S., 1980. Social behavior of the pygmy chimpanzees.Primates, 21: 181–197.Google Scholar
  40. ————, 1984. Interaction over food among pygmy chimpanzees. In:The Pygmy Chimpanzees: Evolutionary Biology and Behavior,R. L. Susman (ed.), Plenum Press, New York & London, pp. 301–324.Google Scholar
  41. Levy, J., 1979. Play behavior and its decline during development in rhesus monkeys (Macaca mulatta). Ph. D. diss., Univ. of Chicago.Google Scholar
  42. Loizos, C., 1966. Play in mammals. In:Play, Exploration, and Territory in Mammals,J. A. Jewell (ed.), Academic Press, London, pp. 1–19.Google Scholar
  43. ————, 1977. Play behaviour in higher primates: a review. In:Primate Ethology,D. Morris (ed.), Aldine, Chicago, pp. 226–282.Google Scholar
  44. Morgan, B. J. T., M. J. A. Simpson, J. P. Hanby, &J. Hall-Craggs, 1976. Visualizing interaction and sequential data in animal behavior: theory and application of cluster-analysis methods.Behaviour, 59: 1–43.Google Scholar
  45. Nishida, T., 1970. social behavior and relationship among wild chimpanzees of the Mahali mountains.Primates, 11: 47–87.CrossRefGoogle Scholar
  46. ————, 1983. Alpha status and agonistic alliance in wild chimpanzees (Pan troglodytes schweinfurthii).Primates, 24: 318–336.Google Scholar
  47. ———— &M. Hiraiwa-Hasegawa, 1987. Chimpanzees and bonobos: cooperative relationships among males. In:Primate Societies,B. B. Smuts,D. L. Cheney,R. M. Seyfarth,R. W. Wrangham, andT. T. Struhsaker (eds.), Univ. of Chicago Press, Chicago, pp. 165–177.Google Scholar
  48. Oki, J. &Y. Maeda, 1973. Grooming as a regulator of behavior in Japanese macaques. In:Behavioral Regulators of Behavior in Primates,C. R. Carpenter (ed.), Bucknell Univ. Press, Lewisburg, pp. 149–163.Google Scholar
  49. Packer, C. &A. Pusey, 1979. Female aggression and male membership in troops of Japanese macaques and olive baboons.Folia Primatol., 31: 212–218.PubMedGoogle Scholar
  50. Redican, W. K., 1975. Facial expressions in nonhuman primates. In:Primate Behavior,L. A. Rosenblum (ed.), Academic Press, New York, San Francisco, & London, pp. 103–194.Google Scholar
  51. Sade, D. S., 1965. Some aspects of parent-offspring and sibling relations in a group of rhesus monkeys, with a discussion of grooming.Amer. J. Phys. Anthropol., 23: 1–18.CrossRefGoogle Scholar
  52. Savage, E. S. &R. Bakeman, 1978. Sexual morphology and behavior inPan paniscus. In:Recent Advances in Primatology,R. Chivers &J. Herbert (eds.), Academic Press, New York, pp. 613–616.Google Scholar
  53. Schaller, G. B., 1963.The Mountain Gorilla: Ecology and Behavior. Univ. of Chicago Press, Chicago.Google Scholar
  54. Silk, J. B., 1982. Altruism among femaleMacaca radiata: explanations and analysis of patterns of grooming and coalition formation.Behaviour, 79: 162–188.Google Scholar
  55. Struhsaker, T. T., 1967. Auditory communication among vervet monkeys (Cercopithecus aethiops). In:Social Communication Among Primates,S. A. Altmann (ed.), Univ. of Chicago Press, Chicago, pp. 281–324.Google Scholar
  56. van Hooff, J. A. R. A. M., 1962. Facial expressions in higher primates.Symp. Zool. Soc. London, 8: 97–125.Google Scholar
  57. ————, 1969. The facial displays of the catarrhine monkeys and apes. In:Primate Ethology,D. Morris (ed.), Anchor Doubleday, Garden City, New York, pp. 9–88.Google Scholar
  58. de Waal, F. B. M. &R. M. Ren, 1988. Comparison of the reconciliation behavior of stumptail and rhesus macaques.Ethology, 78: 129–142.Google Scholar
  59. ———— &A. van Roosmalen, 1979. Reconciliation and consolation among chimpanzees.Behav. Ecol. Sociobiol., 5: 55–66.CrossRefGoogle Scholar
  60. ———— &D. Yoshihara, 1983. Reconciliation and redirected affection in rhesus monkeys.Behaviour, 85: 224–241.Google Scholar
  61. Watanabe, K., 1979. Alliance formation in a free-ranging troop of Japanese macaques.Primates, 20: 459–474.CrossRefGoogle Scholar
  62. Watts, D. P., 1984. Composition and variability of mountain gorilla diets in the central Virungas.Amer. J. Primatol., 7: 323–356.CrossRefGoogle Scholar
  63. ————, 1985. Relations between group size and composition and feeding competition in mountain gorilla groups.Anim. Behav., 33: 72–85.Google Scholar
  64. Wrangham, R. W., 1975.The Behavioral Ecology of Chimpanzees in Gombe National Park, Tanzania. Ph. D. diss., Univ. of Cambridge, Cambridge.Google Scholar
  65. Yamagiwa, J., 1986. Activity rhythm and the ranging of a solitary male mountain gorilla (Gorilla gorilla beringei).Primates, 27: 273–282.CrossRefGoogle Scholar
  66. ————, 1987a. Intra- and inter-group interactions of an all-male group of Virunga mountain gorillas (Gorilla gorilla beringei).Primates, 28: 1–30.Google Scholar
  67. ————, 1987b. Male life history and the social structure of wild mountain gorillas (Gorilla gorilla beringei). In:Evolution and Coadaptation in Biotic Communities,S. Kawano,J. H. Connell, &T. Hidaka (eds.), Univ. of Tokyo Press, Tokyo, pp. 31–51.Google Scholar

Copyright information

© Japan Monkey Centre 1992

Authors and Affiliations

  • Juichi Yamagiwa
    • 1
  1. 1.Primate Research InstituteKyoto UniversityAichiJapan

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