International Journal of Primatology

, Volume 21, Issue 2, pp 269–286 | Cite as

Primate Community Dynamics in Old Growth Forest over 23.5 Years at Ngogo, Kibale National Park, Uganda: Implications for Conservation and Census Methods

  • John C. Mitani
  • Thomas T. Struhsaker
  • Jeremiah S. Lwanga
Article

Abstract

Few data exist regarding long-term changes in primate populations in old-growth, tropical forests. In the absence of this information, it is unclear how to assess population trends efficiently and economically. We addressed these problems by conducting line-transect censuses 23.5 years apart at the Ngogo study area in Kibale National Park, Uganda. We conducted additional censuses over short time intervals to determine the degree to which the temporal distribution of censuses affected estimates of primate numbers. Results indicate that two species, blue monkeys and red colobus, may have experienced significant reductions over the past 23.5 years at Ngogo. In contrast, five other species, baboons, black-and-white colobus, chimpanzees, mangabeys, and red-tailed guenons, have not changed in relative abundance. Additional findings indicate that different observers may vary significantly in their estimates of sighting distances of animals during censuses, thus rendering the use of measures of absolute densities problematic. Moreover, censuses conducted over short periods produce biased estimates of primate numbers. These results provide guidelines for the use of line-transect censuses and underscore the importance of protecting large blocks of forests for primate conservation.

conservation censuses population dynamics primates 

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REFERENCES

  1. Butynski, T. (1990). Comparative ecology of blue monkeys (Cercopithecus mitis) in high-and low-density subpopulations. Ecol. Monogr. 60: 1-26.Google Scholar
  2. Caughley, G. (1980). Analysis of Vertebrate Populations. Wiley, New York.Google Scholar
  3. Chapman, C., Fedigan, L. M., and Fedigan, L. (1988). A comparison of transect methods of estimating population densities of Costa Rican primates. Brenesia 30: 67-80.Google Scholar
  4. Connell, J. (1978). Diversity in tropical rain forests and coral reefs. Science 199: 1302-1310.Google Scholar
  5. Defler, T., and Pintor, D. (1985). Censusing primates by transect in a forest of known primate density. Int. J. Primatol. 6: 243-259.Google Scholar
  6. Freeland, W. (1979). Primate social groups as biological islands. Ecology 60: 719-728.Google Scholar
  7. Ghiglieri, M. (1984). The Chimpanzees of the Kibale Forest, Columbia University Press, New York.Google Scholar
  8. Hutchinson, G. E. (1961). The paradox of plankton. Am. Nat. 95: 137-145.Google Scholar
  9. Lwanga, J. (1987). Group Fission in Blue Monkeys (Cercopithecus mitis stuhlmanni): Effects on the Socioecology in Kibale Forest, Uganda. M.Sc. thesis. Makerere University, Kampala, Uganda.Google Scholar
  10. Mitani, J., and Watts, D. (1999). Demographic influences on the hunting behavior of chimpanzees. Am. J. Phys. Anthrop. 109: 439-454.Google Scholar
  11. National Research Council (1981). Techniques for the Study of Primate Population Ecology. National Academy Press, Washington, D.C.Google Scholar
  12. Newbery, D., Prins, H., and Brown, N. (1998). Dynamics of Tropical Communities, Blackwell Science, Oxford.Google Scholar
  13. Nishida, T. (1968). The social group of wild chimpanzees in the Mahale Mountains. Primates 9: 167-224.Google Scholar
  14. Rowe, N. (1996). The Pictorial Guide to the Living Primates. Pogonias Press, East Hampton, New York.Google Scholar
  15. Seber, G. (1982). The Estimation of Animal Abundance, and Related Parameters. Macmillan, New York.Google Scholar
  16. Siegel, S., and Castellan, N. J. (1988). Nonparametric Statistics for the Behavioral Sciences. McGraw-Hill, New York.Google Scholar
  17. Siex, K., and Struhsaker, T. (1999) Ecology of the Zanzibar red colobus monkey: Demographic variability and habitat stability. Int. J. Primatol. 20: 163-192.Google Scholar
  18. Skorupa, J. (1986). Responses of rainforest primates to selective logging in Kibale Forest, Uganda: A summary report. In Benirschke, K. (ed.), Primates: The Road to Self-Sustaining Populations. Springer-Verlag, New York, pp. 57-70.Google Scholar
  19. Skorupa, J. (1988). The Effects of Selective Timber Harvesting on Rain-Forest Primates in Kibale Forest, Uganda. Ph.D. thesis, University of California, Davis, California.Google Scholar
  20. Struhsaker, T. (1975). The Red Colobus Monkey. University of Chicago Press, Chicago.Google Scholar
  21. Struhsaker, T. (1978). Food habits of five monkey species in the Kibale Forest, Uganda. In Chivers, D., and Herbert, J. (eds.), Recent Advances in Primatology. Academic Press, London, pp. 225-248.Google Scholar
  22. Struhsaker, T. (1997). Ecology of an African Rain Forest. University Press of Florida, Gainesville.Google Scholar
  23. Struhsaker, T. (in press). Variation in adult sex ratios of red colobus monkey social groups: implications for interspecific comparisons. In Kappeler, P. (ed.), Primate Males. Cambridge University Press, Cambridge.Google Scholar
  24. Struhsaker, T., and Leakey, M. (1990). Prey selectivity by crowned hawk-eagles on monkeys in the Kibale Forest, Uganda. Behav. Ecol. Sociobiol. 26: 435-443.Google Scholar
  25. Struhsaker, T., and Leland, L. (1979). Socioecology of five sympatric monkey species in the Kibale Forest, Uganda. Adv. Study Behav. 9: 159-228.Google Scholar
  26. Struhsaker, T., and Leland, L. (1988). Group fission in redtail monkeys (Cercopithecus ascanius) in the Kibale Forest, Uganda. In Gautier-Hion, A., Bourliere, F., Gautier, J. P., and Kingdon, J. (eds.), A Primate Radiation: Evolutionary Biology of the Guenons. Cambridge University Press, Cambridge, pp. 364-388.Google Scholar
  27. Whitesides, G., Oates, J., Green, S., and Kluberdanz, R. (1988). Estimating primate densities from transects in a West African rain forest: A comparison of techniques. J. Anim. Ecol. 57: 345-367.Google Scholar

Copyright information

© Plenum Publishing Corporation 2000

Authors and Affiliations

  • John C. Mitani
  • Thomas T. Struhsaker
  • Jeremiah S. Lwanga

There are no affiliations available

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