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International Journal of Primatology

, Volume 18, Issue 1, pp 61–72 | Cite as

Charcoal Consumption by Zanzibar Red Colobus Monkeys: Its Function and Its Ecological and Demographic Consequences

  • Thomas T. Struhsaker
  • David O. Cooney
  • Kirstin S. Siex
Article

Abstract

The Zanzibar red colobus monkey is the only primate, aside from humans, known to eat charcoal in the wild. All age classes and both sexes eat charcoal, but only those groups living in perennial gardens or near human dwellings do so. The habit appears to be transmitted from mother to offspring by imitation, but how it developed in the first place is unknown. Sources of charcoal include charred stumps, logs, and branches, as well as that produced in kilns by humans. These charcoals adsorb organic materials, such as phenolics, particularly well and, as a consequence, remove these compounds, which have the potential to be toxic or interfere with digestion or both. The extreme inertness of charcoal makes it an unlikely source of minerals to the colobus. We conclude that, by eating charcoal, monkeys living in gardens with a high density of food species dominated by exotic trees — Indian almond and mango — are able to exploit this abundant food resource that is high in total phenolic content much more effectively than in the absence of charcoal. The young leaves of these exotic tree species are also very high in protein and highly digestible. The benefits of charcoal eating are most likely due to the fact that charcoal adsorbs phenolics better than proteins. This may explain in large part why the birth rates and population densities of the colobus living in the Indian almond and mango habitat adjacent to the Jozani Forest are significantly higher than those in the ground-water forest. The population density of colobus in this small area is the highest ever recorded for a nonhuman anthropoid (≥700/km 2 ). It may not, however, be a stable situation, as there are indications of higher levels of aggression, lower recruitment into the medium-juvenile size class, and overbrowsing.

Zanzibar red colobus Procolobus kirkii charcoal eating geophagy 

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REFERENCES

  1. Bennett, E. L. (1983). The Banded Langur: Ecology of a Colobine in a West Malaysian Rain Forest, Ph.D. thesis, University of Cambridge, Cambridge.Google Scholar
  2. Clutton-Brock, T. H. (1975). Feeding behaviour of red colobus and black-and-white colobus in East Africa. Folia Primatol. 23: 165–207.Google Scholar
  3. Cooney, D. O. (1995). Activated Charcoal in Medical Applications, Marcel Dekker, New York.Google Scholar
  4. Cooney, D. O., and Struhsaker, T. T. (1997). Adsorptive capacity of charcoals eaten by Zanzibar red colobus monkeys: Implications for reducing dietary toxins. Int. J. Primat. 18 (in press).Google Scholar
  5. Davies, A. G., and Baillie, I. C. (1988). Soil-eating by red leaf monkeys (Presbytis rubicunda) in Sabah, Northern Borneo. Biotropica 20: 252–258.Google Scholar
  6. Halsted, J. A. (1968). Geophagia in man: Its nature and nutritional effects. Am. J. Clin. Nutr. 21: 1384–1393.Google Scholar
  7. Hegnauer, R. (1964). Chemotaxonomie der pflanzen, band 3, Birkhauser Verlag, Basel/Stuttgart.Google Scholar
  8. Hladik, C. M. (1973). Alimentation et activite d'un groupe de chimpanzes reintroduits en forest gabonaise. Terre Vie 27: 343–413.Google Scholar
  9. Hladik, C. M. (1977). A comparative study of the feeding strategies of two sympatric species of leaf monkeys: Presbytis senex and Presbytis entellus. In Clutton-Brock, T. H. (ed.), Primate Ecology: Studies of Feeding and Ranging Behaviour in Lemurs, Monkeys and Apes, Academic Press, London, pp. 324–353.Google Scholar
  10. Izawa, K. (1975). Foods and feeding behavior of monkeys in the upper Amazon basin. Primates 16(3): 295–316.Google Scholar
  11. Johns, T. (1986). Detoxification function of geophagy and domestication of the potato. J. Chem. Ecol. 12: 635–646.Google Scholar
  12. Kay, R. N. B., and Davies, A. G. (1994). Digestive physiology. In Davies, A. G., and Oates, J. F. (eds.), Colobine Monkeys: Their Ecology, Behaviour and Evolution, Cambridge University Press, Cambridge, pp. 229–249.Google Scholar
  13. Marsh, C. W. (1978). Ecology and Social Organization of the Tana River Red Colobus, Colobus badius rufomitratus, Ph.D. thesis, University of Bristol, Bristol, UK.Google Scholar
  14. Mturi, F. A. (1991). The Feeding Ecology and Behaviour of the Red Colobus Monkey (Colobus badius kirkii), Ph.D. thesis, University of Dar es Salaam, Tanzania.Google Scholar
  15. Mturi, F. A. (1993). Ecology of the Zanzibar red colobus monkey, Colobus badius kirkii (Gray, 1968), in comparison with other red colobines. In Lovett, J. C., and Wasser, S. K. (eds.), Biogeography and Ecology of the Rain Forests of Eastern Africa, Cambridge University Press, Cambridge, pp. 243–265.Google Scholar
  16. Oates, J. F. (1978). Water-plant and soil consumption by guereza monkeys (Colobus guereza): A relationship with minerals and toxins in the diet? Biotropica 10: 241–253.Google Scholar
  17. Oates, J. F. (1994). The natural history of African colobines. In Davies, A. G., and Oates, J. F. (eds.), Colobine Monkeys: Their Ecology, Behaviour and Evolution, Cambridge University Press, Cambridge.Google Scholar
  18. Oates, J. F., Waterman, P. G., and Choo, G. M. (1980). Food selection by the South Indian leaf monkey, Presbytis johnii, in relation leaf chemistry. Oecologia 45: 45–56.Google Scholar
  19. Pollock, J. I. (1977). The ecology and sociology of feeding in Indri indri. In Clutton-Brock, T. H. (ed.), Primate Ecology: Studies of Feeding and Ranging Behaviour in Lemurs, Monkeys and Apes, Academic Press, London, pp. 38–69.Google Scholar
  20. Ripley, S. (1970). Leaves and leaf-monkeys: The social organization of foraging in gray langurs. In Napier, J. R., and Napier, P. H. J. (eds.), Old World Monkeys: Evolution, Systematics and Behavior, Academic Press, New York, pp. 481–509.Google Scholar
  21. Schaller, G. B. (1963). The Mountain Gorilla: Ecology and Behavior, University of Chicago Press, Chicago.Google Scholar
  22. Siex, K. S. (1995). The Zanzibar Red Colobus Monkey (Procolobus kirkii): Ecology, Demography and Use of Cocos nucifera, M.Sc. thesis, University of Florida, Gainesville.Google Scholar
  23. Vermeer, D. E., and Ferrell, R. E., Jr. (1985). Nigerian geophagical clay: A traditional anti-diarrhoeal pharmaceutical. Science 227: 634–636.Google Scholar
  24. Waterman, P. G., and Kool, K. M. (1994). Colobine food selection and plant chemistry. In Davies, A. G., and Oates, J. F. (eds.), Colobine Monkeys: Their Ecology, Behaviour and Evolution, Academic Press, New York, pp. 251–284.Google Scholar

Copyright information

© Plenum Publishing Corporation 1997

Authors and Affiliations

  • Thomas T. Struhsaker
    • 1
  • David O. Cooney
    • 2
  • Kirstin S. Siex
    • 1
  1. 1.Department of Biological Anthropology and AnatomyDuke UniversityDurham
  2. 2.Department of Chemical and Petroleum EngineeringUniversity of WyomingLaramie

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