Abstract
The effects of human activity on population and social structure are a pantropical concern for primate conservation. We compare census data and social group counts from two forests in the Udzungwa Mountains, Tanzania. The main aim is to relate differences within and between the forests to current theory on the effect of human disturbance on primate abundance and group size. The survey reveals the presence of the restricted-range red colobus, Procolobus gordonorum, in New Dabaga/Ulangambi Forest Reserve (NDUFR). The primate community of NDUFR is impoverished compared to that in Ndundulu forest. Red colobus and black-and-white colobus (Colobus angolensis palliatus) abundance and group size are lowest in NDUFR. Fission-fusion of red colobus social groups may be occurring in previously logged areas of both forests. Our observations are consistent with current theory on the effect of habitat degradation and hunting on primates, but the relative effects of the 2 factors could not be differentiated. We pooled the results with previous data to show that abundance of red colobus in the Udzungwa Mountains is lowest at high elevations. Low red colobus group sizes appear to be related to human activity rather than elevation. Black-and-white colobus and Sykes monkeys (Cercopithecus mitis) show no relationship with elevation. Future studies will require more detailed information on vegetation, diet and ranging patterns to interpret fully intraspecific variation in population demography and social structure in the Udzungwa Mountains.
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Aldrich-Blake, F. P. G. (1970). Problems of social structure in forest monkeys. In Crook, J. H. (ed.), Social Behaviour in Birds and Mammals, Academic Press, London and New York, pp. 79–101.
Beeson, M., and Lea, S. E. G. (1994). Mature leaf chemistry of two Afro-montane forests in relation to feeding by forest guenons (Cercopithecus spp.). Afr. J. Ecol. 32: 317–326.
Bryant, J. P., Chapin, F. S., III, and Klein, D. P. (1983). Carbon/nutrient balance of boreal plants in relation to vertebrate herbivory. Oikos 40: 357–368.
Butynski, T. M. (1990). Comparative ecology of blue monkeys (Cercopithecus mitis) in high and low density subpopulations. Ecol. Monogr. 60(1): 1–26.
Butynski, T. M., Ehardt, C. L., and Struhsaker, T. T. (1998). Notes on two dwarf galagos (Galagoides udzungwensis and Galagoides orinus) in the Udzungwa Mountains, Tanzania. Prim. Conserv. 18: 69–75.
Caldecott, J. O. (1980). Habitat quality and populations of two sympatric gibbons (Hylobatidae) on a mountain in Malaya. Folia Primatol. 33: 291–309.
Chapman, C. A., Balcomb, S. R., Gillespie, T. R., Skorupa, J. P., and Struhsaker, T. T. (2000). Long-term effects of logging on African primate communities: A 28-year comparison from Kibale National Park, Uganda. Conserv. Biol. 14(1): 207–217.
Chapman, C. A., Chapman, L. J., and Gillespie, T. R. (2002). Scale issues in the study of primate foraging: Red colobus of Kibale National Park. Am. J. Phys. Anthropol. 117(4): 349–363.
Clutton-Brock, T. H. (1972). Feeding and Ranging Behaviour of the Red Colobus, Ph.D. Thesis, University of Cambridge, UK.
Cowlishaw, G., and Dunbar, R. (2000). Primate Conservation Biology, University of Chicago Press, Chicago.
Crook, J. H. (1970). The socio-ecology of primates. In Crook, J. H. (ed.), Social Behaviour in Birds and Mammals, Academic Press, London and New York, pp. 103–166.
Day, R. W., and Quinn, G. P. (1989). Comparisons of treatments after an analysis of variance in ecology. Ecological Monographs 59(4): 433–463.
Decker, B. S. (1994). Endangered primates in the Selous Game Reserve and an imminent threat to their habitat. Oryx 28(3): 183–190.
Decker, B. S. (1996). Notes on the behavioural ecology of the Iringa red colobus Procolobus badius gordonorum. Afr. Prim. 2(1): 15–18.
Dinesen, L., and Lehmberg, T. (1996). Problem Identification in Udekwa (Iringa District, Tanzania) in Relation to the Conservation of Forest and Biodiversity. Project identification report for BirdLife Denmark and Zoological Museum, University of Copenhagen.
Dinesen, L., Lehmberg, T., Rahner, M. C., and Fjeldsa, J. (2001). Conservation priorities for the forests of the Udzungwa Mountains, Tanzania, based on primates, duikers and birds. Biolog. Conserv. 99(2): 223–236.
Dudt, J. F., and Shure, D. J. (1994). The influence of light and nutrients on foliar phenolics and insect herbivory. Ecology 75: 86–98.
Durham, N. M. (1975) Some ecological, distributional, and group behavioral features of Atelinae in southern Peru: with commetns on interspecific relations. In Tuttle, R. H. (ed.), Socioecology and Psychology of Primates, Mouton Publishers, The Hague, TheNetherlands, and Paris, France, pp. 87–101.
Ehardt, C. L. (1999–2000). The endemic primates of the Udzungwa Mountains, Tanzania. Afr. Prim. 4(1/2): 15–26.
Ehardt, C. L., Struhsaker, T. T., and Butynski, T. M. (2000). Conservation of the Endangered Primates of the Udzungwa Mountains, Tanzania: Surveys, Habitat Assessment, and Long-Term Monitoring. Unpublished report, Margot Marsh Biodiversity Foundation, and World Wide Fund for Nature, Tanzania.
Ehardt, C. L., Struhsaker, T. T., and Butynski, T. M. (2001). Conservation of the Endangered Primates of the Udzungwa Mountains, Tanzania, Phase II: Population Survey and Census, Demography and Socioecology. Report submitted to the Margot Marsh Biodiversity Foundation, Conservation International.
Fimbel, C., Vedder, A., Dierenfeld, E., and Mulindahabi, F. (2001). An ecological basis for large group size in Colobus angolensis in the Nyungwe Forest, Rwanda. Afr. J. Ecol. 39: 83–92.
Gillespie, T. R., and Chapman, C. A. (2001). Determinants of group size in the red colobus monkey (Procolobus badius): An evaluation of the generality of the ecological constraints model. Behav. Ecol. and Sociobiol. 50: 329–338.
Goss-Custard, J. D., Dunbar, R. I. M., and Aldrich-Blake, F. P. G. (1972). Survival, mating and rearing strategies in the evolution of primate social structure. Folia Primatol. 17: 1–19.
Groves, C. P. (1973). Notes on the ecology and behaviour of the Angola colobus (Colobus angolensis P.L. Sclater 1860) in N.E. Tanzania. Folia Primatol. 20: 12–26.
Hall, J. B. (1988). Reconnaissance Vegetation Survey of the Luhombero Massif, Iringa Region, Tanzania. Department of Forestry and Wood Science, University College of North Wales, Bangor, UK.
Hanya, G., Noma, N., and Agetsuma, N. (2003). Altitudinal and seasonal variations in the diet of Japanese macaques in Yakushima. Primates 44: 51–59.
Hilton-Taylor, C. (Compiler) (2000).2000 IUCN Red List of Threatened Species, IUCN, Gland, Switzerland and Cambridge, UK.
Homewood, K. M., and Rodgers, W. A. (1981). A previously undescribed mangabey from southern Tanzania. Int. J. Primatol. 2(1): 47–55.
Klein, L. L., and Klein, D. B. (1977). Feeding behaviour of the Colombian spider monkey. In Clutton-Brock, T. H. (ed.), Primate Ecology: Studies of Feeding and Ranging Behaviour in Lemurs, Monkeys and Apes. Academic Press, London, New York and San Francisco, USA, pp. 153–181.
Marshall, A. R., Fazey, I., Topp-Jø rgensen, J. E., and Brink, H. (2001a). Tree communities and diversity in New Dabaga/Ulangambi Forest Reserve. In Frontier Tanzania, New Dabaga/Ulangambi Forest Reserve—Botanical and Forest Use Report. Udzungwa Mountains Forest Management and Biodiversity Conservation Project, MEMA, Iringa, Tanzania, pp. 25–37.
Marshall, A. R., Fazey, I., Topp-Jørgensen, J. E., and Brink, H. (2001b). Tree communities and diversity in West Kilombero Scarp Forest Reserve. In Frontier Tanzania, West Kilombero Scarp Forest Reserve—Botanical and Forest Use Report. Udzungwa Mountains Forest Management and Biodiversity Conservation Project, MEMA, Iringa, Tanzania, pp. 27–45.
Marshall, A. R., Brink, H., and Topp-Jø rgensen, J. E. (2001c). Effect of bushfires on forest expansion in West Kilombero Scarp Forest Reserve. In Frontier Tanzania, West Kilombero Scarp Forest Reserve—Botanical and Forest Use Report. Udzungwa Mountains Forest Management and Biodiversity Conservation Project, MEMA, Iringa, Tanzania, pp. 83–101.
Mitani, J. C., Struhsaker, T. T., and Lwanga, J. S. (2000). Primate community dynamics in old growth forest over 23.5 years at Ngogo, Kibale National Park, Uganda: Implications for conservation and census methods. Int. J. Primatol. 21(2): 269–286.
Mittermeier, R. A. (1986). A global overview of primate conservation. In Else, J. G., and Lee, P. C. (eds.), Primate Ecology and Conservation. Cambridge University Press, Cambridge, UK, pp. 325–340.
Mittermeier, R. A. (1987). Effects of hunting on rain forest primates. In Marsh, C. W., and Mittermeier, R. A. (eds.), Primate Conservation in the Tropical Rain Forest. A. R. Liss, Inc., New York, USA, pp. 109–146.
Moyer, D. C. (1992). Report on the Natural Resources Consultancy for the Udzungwa Forest Management Project Preparation Mission—Volume III, Annex 4. Udzungwa Forest Management Project, Dept. of Zoology and Marine Biology, University of Dar es Salaam, Tanzania, and Dept. of Zoology and Physiology, Louisiana State University, USA.
Munyuku, F. C. N. (1993). A Report on New Kidabaga/Ulangambi Forest Reserve inventory Kilolo division, Iringa district. Hifadhi ya Mazingira (HIMA) supported by Iringa Regional and District Forest Offices and DANIDA.
Myers, N., Mittermeier, R. A., Mittermeier, C. G., de Fonseca, G. A. B., and Kent, J. (2000). Biodiversity hotspots for conservation priorities. Nature 403: 853–858.
Nielsen, M. R. (2002). Causes of Unsustainable Resource Exploitation in the Udzungwa Mountains. 1. A cases study of subsistence poaching in New Dabaga Ulangambi Forest Reserve, Tanzania. Unpublished Report, University of Copenhagen, Zoological Museum, Denmark.
Oates, J. F. (1996). Habitat alteration, hunting and the conservation of folivorous primates in African forests. Austr. J. Ecol. 21(1): 1–9.
Oates, J. F., Abedi-Lartey, M., Scott McGraw, W., Struhsaker, T. T., and Whitesides, G. H. (2000). Extinction of a West African red colobus monkey. Conserv. Biol. 14(5): 1526–1532.
Pedersen, U. B., and Topp-Jø rgensen, J. E. (2000). The Impact of Hunting on Three Primate Species in Udzungwa Mountains, Tanzania. Unpublished M.Sc. thesis, University of Copenhagen, Denmark.
Plumptre, A. J., and Reynolds, V. (1994). The effect of selective logging on the primate populations in the Budongo Forest Reserve, Uganda. J. Appl. Ecol. 31: 631–641.
Rodgers, W. A. (1981). The distribution and conservation status of colobus monkeys in Tanzania. Primates 22(1): 33–45.
Rodgers, W. A., and Homewood, K. M. (1982). Biological values and conservation prospects for the forests and primate populations of the Udzungwa Mountains, Tanzania. Biol. Conser. 24: 285–304.
Rodgers, W. A., Homewood, K. M., and Hall, J. B. (1980). The railway and a rare colobus monkey. Oryx 25(5): 491–495.
Siex, K. S., and Struhsaker, T. T. (1999). Ecology of the Zanzibar red colobus monkey: Demographic variability and habitat stability. Int. J. Primatol. 20(2): 163–192.
Skorupa, J. P. (1986). Responses of rainforest primates to selective logging in Kibale Forest, Uganda. In Benirschke, K. (ed.), Primates: The Road to Self-Sustaining Populations. Springer-Verlag, New York, pp. 57–70.
Skorupa, J. P. (1988). The Effects of Selective Timber Harvesting on Rain-forest Primates in Kibale Forest, Uganda. Ph.D. dissertation, University of California, Davis, USA.
Sokal, R. R., and Rohlf, F. J. (1995) Biometry: The Principles and Practice of Statistics in Biological Research, 3rd edition. W.H. Freeman and Company, New York.
Struhsaker, T. T. (1975). The Red Colobus Monkey, University of Chicago Press, Chicago.
Struhsaker, T. T., and Oates, J. F. (1975). Comparison of the behavior and ecology of red colobus and black-and-white colobus monkeys in Uganda: a summary. In Tuttle, R. H. (ed.), Socio-ecology and Psychology of Primates, Mouton, The Hague, The Netherlands, and Paris, France, pp. 103–123.
Struhsaker, T. T. (1997). Ecology of an African Rainforest: Logging in Kibale and the Conflict between Conservation and Exploitation. University Press of Florida, Gainesville, USA.
Struhsaker, T. T. (1999). Primate communities in Africa: The consequence of long-term evolution or the artefact of recent hunting? In Fleagle, J. G., Janson, C. H., and Reed, K. E. (eds.), Primate Communities, Cambridge University Press, Cambridge, pp. 289–294.
Struhsaker, T. T. (2000). The effects of predation and habitat quality on the socioecology of African Monkeys: lessons from the islands of Bioko and Zanzibar. In Whitehead, P. F., and Jolly, C. J. (eds.), Old World Monkeys, Cambridge University Press, pp. 393–430.
Struhsaker, T. T., Marshall, A. R., Detwiler, K. M., Siex, K., Ehardt, C. L., Lisbjerg, D. D., and Butynski, T. M. (2004). Demographic variation among the Udzungwa red colobus (Procolobus gordonorum) in relation to gross ecological and sociological parameters. Int. J. Primatol. 25(3): 615–658.
Struhsaker, T. T., and Leland, L. (1979). Socioecology of five sympatric monkey species in the Kibale Forest, Uganda. In Rosenblatt, J. S., Hinde, R. A., Beer, C., and Busnel, M. C. (eds.), Advances in the Study of Behavior, vol. 9. Academic Press, New York, pp. 159–228.
Struhsaker, T. T., and Leland, L. (1980). Observations on two rare and endangered populations of red colobus monkeys in East Africa: Colobus badius gordonorum and Colobus badius kirkii. Afr. J. Ecol. 18: 191–216.
Terborgh, J., and Janson, C. H. (1986). The socioecology of primate groups. Ann. Rev. Ecol. Syst. 17: 111–135.
Waser, P. (1977) Feding, ranging and group size in the mangabey Cercocebus albigena. In Clutton-Brock, T. H. (ed.), Primate Ecology: Studies of Feeding and Ranging Behaviour in Lemurs, Monkeys and Apes, Academic Press, London, New York and San Francisco, pp. 183–221.
Wasser, S. K. (1993). The socioecology of interspecific associations among the monkeys of the Mwanihana rain forest, Tanzania: a biogeographic perspective. In Lovett, J. C., and Wasser, S. K. (eds.), Biogeography and Ecology of the Rainforests of Eastern Africa, Cambridge University Press, pp. 267–280.
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Marshall, A.R., Topp-Jørgensen, J.E., Brink, H. et al. Monkey Abundance and Social Structure in Two High-Elevation Forest Reserves in the Udzungwa Mountains of Tanzania. Int J Primatol 26, 127–145 (2005). https://doi.org/10.1007/s10764-005-0011-z
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DOI: https://doi.org/10.1007/s10764-005-0011-z