Primates

, Volume 33, Issue 1, pp 69–83 | Cite as

A model of the gelada socio-ecological system

  • R. I. M. Dunbar
Article

Abstract

Data from three populations of gelada baboons are used to generate a model of the species' socio-ecology that relates time budget requirements to group size, day journey length, and relevant environmental parameters. The model is used to examine the range of environmental conditions under which gelada could survive. This analysis indicates that a grazing primate like the gelada would run out of available time for foraging at just above and just below the altitudes at which they are now found. This suggests that, contrary to previous supposition, gelada were not driven into a retreat habitat by more competitivePapio baboons, but rather withdrew from lower altitude habitats because they could not survive under these conditions as the climate deteriorated during the Holocene.

Key Words

Gelada Time budgets Group size Socioecology Model 

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References

  1. Aldrich-Blake, P., T. K. Bunn, R. I. M. Dunbar, &P. M. Headley, 1971. Observations on baboons,Papio anubis, in an arid region in Ethiopia.Folia Primatol., 15: 1–35.Google Scholar
  2. Altmann, S. A., D. G. Post, &D. F. Klein, 1987. Nutrients and toxins of plants in Amboseli, Kenya.Afr. J. Ecol., 25: 279–293.Google Scholar
  3. Anderson, C. O., 1981. Subtrooping in a chacma baboon (Papio ursinus) population.Primates, 22: 445–458.Google Scholar
  4. Boutton, T. W., L. L. Tieszen, &S. K. Imbamba, 1988. Seasonal changes in the nutrient content of East African grassland vegetation.Afr. J. Ecol., 26: 103–115.Google Scholar
  5. Clutton-Brock, T. H. &P. H. Harvey, 1977. Primate ecology and social organisation.J. Zool., Lond., 183: 1–39.Google Scholar
  6. Coe, M. J., D. H. Cummings, &J. Phillipson, 1977. Biomass and production of large herbivores in relation to rainfall and primary production.Oecologia, 22: 341–354.Google Scholar
  7. Crook, J. H., 1966. Gelada baboon herd structure and movement: a comparative report.Symp. Zool. Soc. Lond., 18: 237–258.Google Scholar
  8. Demment, M. W. &P. J. van Soest, 1985. A nutritional explanation for body-size patterns of ruminant and non-ruminant herbivores.Amer. Naturalist, 125: 641–672.CrossRefGoogle Scholar
  9. Deshmukh, I. K., 1984. A common relationship between precipitation and grassland peak biomass for East and southern Africa.Afr. J. Ecol., 22: 181–186.Google Scholar
  10. ————, 1986. Primary production of a grassland in Nairobi National Park, Kenya.J. Appl. Ecol., 23: 115–123.Google Scholar
  11. Dunbar, R. I. M., 1977. Feeding ecology of gelada baboons: a preliminary report. In:Primate Ecology,T. H. Clutton-Brock (ed.), Academic Press, London, pp. 250–273.Google Scholar
  12. ————, 1979. Energetics, thermoregulation, and the behavioural ecology of klipspringer.Afr. J. Ecol., 17: 217–230.Google Scholar
  13. ————, 1980. Demographic and lifehistory variables of a population of gelada baboons (Theropithecus gelada).J. Anim. Ecol., 49: 485–506.Google Scholar
  14. ————, 1984.Reproductive Decisions: An Economic Analysis of Gelada Baboon Social Strategies. Princeton Univ. Press, Princeton, New Jersey.Google Scholar
  15. ————, 1988.Primate Social Systems. Chapman & Hall, London.Google Scholar
  16. ————, 1989. Social systems as optimal strategy sets: the costs and benefits of sociality. In:Comparative Socioecology,V. Standen &R. Foley (eds.), Blackwell Sci. Publ., Oxford, pp. 131–149.Google Scholar
  17. ————, 1990. Ecological modelling in an evolutionary context.Folia Primatol., 53: 235–246.Google Scholar
  18. ————, 1991a. The functional significance of social grooming in primates.Folia Primatol, 57: 121–131.Google Scholar
  19. ————, 1991b. The behavioural ecology of the extinct theropithecines. In: Theropithecus: the Rise and Decline of a Primate Genus,N. Jablonski &R. Foley (eds.), Cambridge Univ. Press, Cambridge.Google Scholar
  20. ----, in press. Time: a hidden constraint on the behavioural ecology of baboons.Behav. Ecol. Sociobiol. Google Scholar
  21. ———— &U. Bose, 1991. Adaptations to grass-eating in gelada baboons.Primates, 32: 1–7.CrossRefGoogle Scholar
  22. ———— &P. Dunbar, 1974a. Ecological relations and niche separation between sympatric terrestrial primates in Ethiopia.Folia Primatol., 21: 36–60.PubMedGoogle Scholar
  23. ———— & ————, 1974b. On hybridisation betweenTheropithecus gelada andPapio anubis in the wild.J. Human Evol., 3: 187–192.Google Scholar
  24. ———— & ————, 1975.Social Dynamics of Gelada Baboons. Karger, Basel.Google Scholar
  25. ———— & ————, 1988. Maternal time budgets of gelada baboons.Anim. Behav., 36: 970–980.Google Scholar
  26. ———— &M. Sharman, 1984. Is social grooming altruistic?Z. Tierpsychol., 64: 163–173.Google Scholar
  27. Good, N. E. &D. H. Bell, 1980. Photosynthesis, plant productivity and crop yield. In:Biology of Crop Productivity,P. S. Carlson (ed.), Academic Press, New York, pp. 3–52.Google Scholar
  28. Hurni, H., 1982.Simen Mountains — Ethiopia. Vol. II. Climate and the Dynamics of Altitudinal Belts from the Last Cold Period to the Present Day. Geographical Institute, Univ. of Bern, Switzerland.Google Scholar
  29. Ikeda, H., 1982. Population changes and ranging behaviour of wild Japanese monkeys at Mt. Kawaradake in Kyushu, Japan.Primates, 23: 338–347.Google Scholar
  30. Iwamoto, T., 1979. Feeding ecology. In:Ecological and Sociological Studies of Gelada Baboons,M. Kawai (ed.), Karger, Basel & Japan Science Press, Tokyo, pp. 280–330.Google Scholar
  31. ————, 1991. Food digestion and energetic conditions ofTheropithecus gelada. In: Theropithecus: The Rise and Decline of a Primate Genus,N. Jablonski &R. Foley (eds.), Cambridge Univ. Press, Cambridge.Google Scholar
  32. ———— &R. I. M. Dunbar, 1983. Thermoregulation, habitat quality and the behavioural ecology of gelada baboons.J. Anim. Ecol., 52: 357–366.Google Scholar
  33. Jolly, C. J., 1972. The classification and natural history ofTheropithecus (Simopithecus) (Andrews, 1916), baboons of the African Plio-Pleistocene.Bull. Brit. Mus. Nat. Hist. (Geol.), 22: 1–123.Google Scholar
  34. Kawai, M. (ed.), 1979.Ecological and Sociological Studies of Gelada Baboons. Karger, Basel & Japan Science Press, Tokyo.Google Scholar
  35. ————,R. I. M. Dunbar, H. Ohsawa, &U. Mori, 1983. Social organisation of gelada baboons: social units and definitions.Primates, 24: 13–24.Google Scholar
  36. Kleiber, M., 1960.The Fire of Life. Wiley, Chichester.Google Scholar
  37. Kummer, H., 1968.Social organisation of Hamadryas Baboons. Karger, Basel.Google Scholar
  38. le Houeron, H. N. &C. H. Hoste, 1977. Rangeland production and annual rainfall relations in the Mediterranean basin and in the African Sahelo-Sudanian zone.J. Range Managemt., 30: 181–189.Google Scholar
  39. Louw, G. N., 1972. The role of advective fog in the water economy of certain Namib desert animals. In:Comparative Physiology of Desert Animals,G. M. O. Maloiy (ed.), Academic Press, London, pp. 297–413.Google Scholar
  40. McKay, A. D., 1971. Seasonal and management effects on the composition and availability of herbage, steer diet and live-weight gains in aThermeda triandra grassland in Kenya. II. Results of herbage studies, diet selected and live-weight gains.J. Agric. Sci., Camb., 76: 9–26.Google Scholar
  41. Mori, A. &G. Belay, 1990. The distribution of baboon species and a new population of gelada baboons along the Wabi-Shebeli River, Ethiopia.Primates, 31: 495–508.Google Scholar
  42. Nicholson, S. E., 1981. The historical climatology of Africa. In:Climate and History,T. M. L. Wigley,M. J. Ingram, &C. Farmer (eds.), Cambridge Univ. Press, Cambridge, pp. 249–270.Google Scholar
  43. Ohsawa, H. &R. I. M. Dunbar, 1984. Variations in the demographic structure and dynamics of gelada baboon populations.Behav. Ecol. Sociobiol., 15: 231–240.CrossRefGoogle Scholar
  44. Parry, M. L., 1975. Secular climatic change and marginal land.Trans. Inst. Brit. Geogr., 64: 1–13.Google Scholar
  45. ————, 1981. Climatic change and the agricultural frontier: a research strategy. In:Climate and History,T. M. L. Wigley,M. J. Ingram, &C. Farmer (eds.), Cambridge Univ. Press, Cambridge, pp. 319–336.Google Scholar
  46. Prins, H. H. T. &J. H. Beekman, 1989. A balanced diet as a goal for grazing: the food of the Manyara buffalo.Afr. J. Ecol., 27: 241–259.Google Scholar
  47. Quris, R., 1975. Ecologie et organisation sociale deCercocebus galeritus agilis dans le nord-est de Gabon.Terre et Vie, 29: 337–398.Google Scholar
  48. Richard, A., 1978.Behavioural Variation: Case Study of a Malagasy Lemur. Bucknell Univ. Press, Lewisburg, Pennsylvania.Google Scholar
  49. Robertson, G., 1987. Plant dynamics. In:Kangaroos: Their Ecology and Management in the Sheep Rangelands of Australia.G. Caughley, N. Shepherd, &J. Short (eds.), Cambridge Univ. Press, Cambridge, pp. 50–68.Google Scholar
  50. de Ruiter, J. R., 1986. The influence of group size on predator scanning and foraging behaviour of wedgecapped capuchin monkeys (Cebus olivaceus).Behaviour, 98: 240–258.Google Scholar
  51. van Schaik, C. P., R. J. de Boer, &I. den Tonkelaar, 1983. The effects of group size on time budgets and social behaviour in wild longtailed macaques (Macaca fascicularis).Behav. Ecol. Sociobiol., 13: 173–181.CrossRefGoogle Scholar
  52. Sharman, M. &R. I. M. Dunbar, 1982. Observer bias in selection of study group in baboon field studies.Primates, 23: 567–573.Google Scholar
  53. Sinclair, A. R. E., 1977.The African Buffalo: A Study of Resource Limitations of Populations. Chicago Univ. Press, Chicago.Google Scholar
  54. van Soest, P. J., 1982.The Nutritional Ecology of the Ruminant. Cornell Univ. Press, Ithaca, New York.Google Scholar
  55. Sokal, R. R. &F. J. Rolf, 1969.Biometry. Freeman, San Francisco.Google Scholar
  56. Stacey, P. B., 1986. Group size and foraging efficiency in yellow baboons.Behav. Ecol. Sociobiol., 18: 175–187.CrossRefGoogle Scholar
  57. Struhsaker, T. T., 1967. Ecology of vervet monkeys (Cercopithecus aethiops) in the Masai-Amboseli game reserve, Kenya.Ecology, 48: 891–904.Google Scholar
  58. Szalay, F. S. &E. Delson, 1979.Evolutionary History of the Primates. Academic Press, New York.Google Scholar
  59. Tappen, N. C., 1960. Problems of distribution and adaptation of the African monkeys.Curr. Anthropol., 1: 91–120.Google Scholar
  60. Waser, P. M., 1977. Feeding, ranging and group size in the managabey,Cercocebus albigena. In:Primate Ecology,T. H. Clutton-Brock (ed.), Academic Press, London, pp. 182–222.Google Scholar
  61. Wrangham, R. W. &B. B. Smuts, 1980. Sex differences in the behavioural ecology of chimpanzees in the Gombe National Park, Tanzania.J. Reprod. Fertil., Suppl., 28: 13–31.Google Scholar

Copyright information

© Japan Monkey Centre 1992

Authors and Affiliations

  • R. I. M. Dunbar
    • 1
  1. 1.Department of AnthropologyUniversity College LondonLondonEngland

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