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Preliminary assessment of the impacts of human activities on gorillas Gorilla gorilla gorilla and other wildlife at Dzanga-Sangha Reserve, Central African Republic

Published online by Cambridge University Press:  24 April 2009

Melissa J. Remis
Melissa J. Remis
Affiliation:
Department of Sociology and Anthropology, Purdue University, West Lafayette, IN 47907–1365, USA. Fax + 1 765 496 1476; E-mail: [email protected]
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Abstract

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The aim of this study was to make preliminary assessments of the effects of human activities on the gorillas and other wildlife in the Dzanga-Ndoki Park and broader Dzanga-Sangha Dense Forest Reserve (RDS), Central African Republic. During a month-long survey in 1997, observation and sign of humans and large mammals, including ape nest-sites, were recorded on 81.2 km of line transects in three sectors of the park and reserve. Human activities, including intensities of logging and hunting, appeared to decrease with distance from the population centres and were lower in the park than in the reserve sectors. Encounter rates with sign of duikers Cephalophus spp., monkeys Cercopithecus spp. and Cercocebus albigena, elephants Loxodonta africana, and gorillas Gorilla gorilla gorilla were generally lower in regions of high human activity in the reserve than in the park sectors. Nevertheless, gorilla nest-site densities did not vary significantly between sectors or with human activity levels. A high frequency of zero (bare ground) nests at RDS suggests that gorilla surveys that rely on line transect methods and use nest decomposition rates from other studies may sometimes underestimate gorilla densities. This study suggests that current levels of exploitation in managed hunting zones of national forest reserves may be negatively affecting targeted wildlife populations in these zones. Assessments should be a regular part of efforts to monitor the health of wildlife populations in managed protected zones. Participation by Central Africans in research will continue to benefit conservation and development efforts.

Keywords

Conservationduikerselephantshuntingprimatessurvey methods.
Type
Research Article
Information
Oryx , Volume 34 , Issue 1 , January 2000 , pp. 56 - 65
Copyright
Copyright © Fauna and Flora International 2000

References

Alpert, P. (1996) Integrated Conservation and Development Projects: examples from Africa. BioScience, 46, 845–855.CrossRefGoogle Scholar
Asibey, E.O.A. (1974) Wildlife as a source of protein in Africa south of the Sahara. Biological Conservation, 6, 32–39.CrossRefGoogle Scholar
Auzel, P. & Wilkie, D. (in press) Wildlife use in northern Congo: hunting in a commercial logging concession. In Evaluating the Sustainability of Hunting in Tropical Forests (eds Robinson, J. G. and Bennett, E. L.). Yale University Press, New Haven.Google Scholar
Aveling, C. & Aveling, R. (1987) Report from the Zaire gorilla conservation project. Primate Conservation, 8, 162–164.Google Scholar
Barnes, R.F.W., Barnes, K.L., Alers, M.P.T. & Blom, A. (1991) Man determines the distribution of elephants in the rainforests of northeastern Gabon. African Journal of Ecology, 29, 54–63.CrossRefGoogle Scholar
Bermejo, M. (1997) Study of western lowland gorillas in the Lossi forest of northern Congo and a pilot gorilla tourism plan. Gorilla Conservation News, 11, 6–7.Google Scholar
Blake, S., Rogers, E., Fay, M., Ngangoue, M. & Ekebe, G. (1995) Swamp gorillas in northern Congo. African Journal of Ecology, 33, 285–290.CrossRefGoogle Scholar
Brugiere, D., Sakom, D. & Sinassonasibe, J.P. (1999) Estimation des Densites et Analyse du Comportement Nidificateur des Gorilles et Chimpanzes en Foret de Ngotto. AGRECO-GEIE, Ecofac, Central African Republic.Google Scholar
Bryant, D., Nielson, D. & Tangley, L. (1997) The Last Frontier Forests: Ecosystems and Economics on The Edge. World Resources Institute, Washington, DC.Google Scholar
Buckland, S.T., Anderson, D.R., Burnham, K.P. & Laake, J.L. (1993) Distance Sampling: Estimating Abundance of Biological Populations. Chapman and Hall, London.Google Scholar
Carroll, R.W. (1988) Relative density, range extension and conservation potential of the lowland gorilla (Gorilla gorilla gorilla) in the Dzanga-Sangha region of southwestern Central African Republic. Mammalia, 53, 309–323.Google Scholar
Carroll, R.W. (1997) Feeding ecology of lowland gorillas (Gorilla gorilla gorilla) in the Dzanga-Sangha dense forest reserve of the Central African Republic. PhD thesis, Yale University, New Haven, CT.Google Scholar
Doran, D.M. & MacNeilage, A.J. (1998) Variation in behavior of gorilla subspecies: what's diet got to do with it? Evolutionary Anthropology, 6, 120–131.3.0.CO;2-H>CrossRefGoogle Scholar
Fay, J.M. (1989) Partial completion of a census of the western lowland gorilla (Gorilla gorilla gorilla) in southwestern Central African Republic. Mammalia, 52, 203–215.Google Scholar
Fay, J.M. & Agnagna, M. (1992) Census of gorillas in northern Republic of Congo. American Journal of Primatology, 27, 275–284.CrossRefGoogle ScholarPubMed
Fitzgibbon, C.D., Mogaka, H. & Fanshawe, J.H. (1995) Subsistence hunting in Arabuko-Sokoke Forest, Kenya and its effects on mammal populations. Conservation Biology, 9, 1116–1126.CrossRefGoogle ScholarPubMed
Goldsmith, M.L. (1996) Ecological influences on gorilla ranging patterns at Bai Hokou, Dzanga-Sangha Reserve. PhD Thesis, State University of New York, Stonybrook, NY.Google Scholar
Gonzalez-Kirchner, J.P. (1997) Census of western lowland gorilla population in Rio Muni region, Equatorial Guinea. Folia Zoologica, 46, 15–22.Google Scholar
Hall, J.S., White, L.J.T., Bila-Isia, I., Omari, I., Morland, H.S., Williamson, E.A. et al. (1998) A Survey of Grauer's gorillas (Gorilla g. graueri) and chimpanzees (Pan troglodytes schweinfurthi) in the Kahuzi-Biega National Park Lowland Sector and adjacent forest in eastern Congo. International Journal of Primatology, 19, 207–235.CrossRefGoogle Scholar
Hall, J.S., White, L.J.T., Williamson, E.A., Inogwabini, B.-I. & Omari, I. (in press) Distribution, relative abundance and preliminary biomass estimates for anthropoid primates within the Kahuzi-Biega Lowland Sector and adjacent forest in Eastern Democratic Republic of Congo. American Journal of Primatology.Google Scholar
Harcourt, A.H. (1996) Is the gorilla a threatened species? How should we judge? Biological Conservation, 75, 165–176.CrossRefGoogle Scholar
Harcourt, A.H., Fossey, D. & Sabater Pi, J. (1981) Demography of Gorilla gorilla. Journal of Zoology, 195, 215–233.CrossRefGoogle Scholar
Hardin, R. & Remis, M.J. (1997) Research and Rural Development Workshops, Bayanga, Central African Republic July 31–August 2, 1997. WWF Fund-US/BSP Conference Proceedings, Washington, DC.Google Scholar
Jones, C. & Sabater Pi, J. (1971) Comparative ecology of Gorilla gorilla and Pan troglodytes in Rio Muni, West Africa. Bibliographia Primatologica, 13, 1–96.Google Scholar
Kano, T. & Asato, R. (1994) Hunting pressure on chimpanzees and gorillas in the Motaba River Area, northeastern Congo. African Study Monographs, 15, 143–162.Google Scholar
Laake, J.L., Buckland, S.T., Anderson, D.R. & Burnham, K.P. (1994) DISTANCE User's Guide v.3. Colorado Cooperative Fish and Wildlife Research Unit, Colorado State University, Fort Collins, CO.Google Scholar
MacNeilage, A.J. (1995) Mountain gorillas in the Virunga Volcanoes: ecology and carrying capacity. PhD Thesis, University of Bristol, Bristol, UK.Google Scholar
Magliocca, F., Querouil, S. & Gautier-Hion, A. (1999) Population structure and group composition of western lowland gorillas in north-western Republic of Congo. American Journal of Primatology, 48, 1–14.3.0.CO;2-2>CrossRefGoogle ScholarPubMed
Malenky, R., Kuroda, S., Wrangham, R.W. & Vineberg, E. (1994) The significance of terrestrial herbaceous foods for bonobos, chimpanzees and gorillas. In Chimpanzee Cultures (eds Wrangham, R. W., McGrew, W. C., Waal, F. B. M. de and Heltne, P. G.), pp. 59–76. Harvard University Press, Cambridge, MA.Google Scholar
Muchaal, P.K. & Ngandjui, G. (1999) Impact of village hunting on wildlife populations in the Western Dja Reserve, Cameroon. Conservation Biology, 13, 385–396.CrossRefGoogle Scholar
Murnyak, D. (1981) Censusing the gorillas in Kahuzi-Biega National Park. Biological Conservation, 21, 163–176.CrossRefGoogle Scholar
Noss, A.J. (1997) Challenges to nature conservation with community development in central African forests. Oryx, 31, 180–188.CrossRefGoogle Scholar
Noss, A.J. (1998) Cable snares and bushmeat markets in a central African forest. Environmental Conservation, 25, 228–233.CrossRefGoogle Scholar
Oates, J.F. (1995) The danger of conservation by rural development: a case study from the forest of Nigeria. Oryx, 29, 115–122.CrossRefGoogle Scholar
Oates, J.F. (1996) Habitat alteration, hunting and the conservation of folivorous primates in African forests. Australian Journal of Ecology, 21, 1–9.Google Scholar
Ray, J.C. (1996) Resource use patterns among mongooses and other carnivores in a Central African Rainforest. PhD Dissertation, University of Florida, Gainesville, FL.Google Scholar
Remis, M.J. (1993) Nesting behavior of lowland gorillas in the Dzanga-Sangha Reserve, Central African Republic: implications for population estimates and understandings of group dynamics. Tropics,2, 245–256.CrossRefGoogle Scholar
Remis, M.J. (1994) Feeding ecology and positional behavior of western lowland gorillas at Dzanga-Sangha Reserve, Central African Republic. PhD Thesis, Yale University, New Haven, CT.Google Scholar
Remis, M.J. (1997) Western lowland gorillas as seasonal frugivores: use of variable resources. American journal of Primatology, 43, 87–109.3.0.CO;2-T>CrossRefGoogle ScholarPubMed
Remis, M.J. & Mbassangao, B. (1998) Gorilla research in the Central African Republic and preliminary results of impacts of human activities on gorillas at the Dzanga-Sangha Reserve. Gorilla Conservation News, 12, 7–8.Google Scholar
Robinson, J.G. (1993) The limits to caring: sustainable living and the loss of biodiversity. Conservation Biology, 7, 20–28.CrossRefGoogle Scholar
Saterson, K. (1990) Integration of biological conservation with development policy: the role of ecological analysis. In Race to Save the Tropics (ed. Goodland, R.), pp. 141–159. Island Press, Washington, DC.Google Scholar
Schaller, G.B. (1963) The Mountain Gorilla: Ecology and Behavior. University of Chicago Press, Chicago, IL.Google Scholar
Schiel, C.H. (1990) Promoting indigenous research capacities in developing countries. The International Foundation for Science (IFS) and its work. Ambio, 19, 346–348.Google Scholar
Siegel, S. & Castellan, N.J. Jr, (1988) Nonparametric Statistics for the Behavioral Sciences. McGraw-Hill, New York.Google Scholar
SigmaStat, (1999) Sigma Statistical Package for Windows version 2. Jandel Software, Chicago, IL.Google Scholar
Skorupa, J.P. (1987) Do line-transect surveys systematically underestimate primate densities in logged forests? American Journal of Primatology, 13, 1–9.CrossRefGoogle ScholarPubMed
Sokal, R.R. & Rohlf, F.J. (1981) Biometry. W.H. Freeman and Company, New York.Google Scholar
Struhsaker, T.T. (1997) Ecology of an African Rain Forest: Logging in Kibale and the Conflict between Conservation and Exploitation. University Press of Florida, Gainesville, FL.Google Scholar
Tutin, C.E.G. & Fernandez, M. (1984) Nationwide census of gorilla (G. g. gorilla) and chimpanzee (Pan t. troglodytes) populations in Gabon. American Journal of Primatology, 6, 313–336.CrossRefGoogle Scholar
Tutin, C.E.G., Parnell, R.J., White, L.J.T. & Fernandez, M. (1995) Nest building by lowland gorillas in the Lope Reserve, Gabon: environmental influences and implications for censusing. International Journal of Primatology, 16, 53–76.CrossRefGoogle Scholar
Weber, W. & Vedder, A. (1983) Population dynamics of the Virunga gorillas 1959–1978. Biological Conservation, 26, 341–366.CrossRefGoogle Scholar
White, L.J.T. (1994) Biomass of rain forest mammals in the Lope Reserve, Gabon. Journal of Tropical Ecology, 63, 499–512.Google Scholar
White, L.J.T., Rogers, M.E., Tutin, C.E.G., Williamson, E.A. & Fernandez, M. (1995) Herbaceous vegetation in different forest types in the Lope Reserve, Gabon: implications for keystone food availability. African Journal of Ecology, 33, 124–141.CrossRefGoogle Scholar
Whitesides, G.H., Oates, J.F., Green, S.M. & Kluberdanz, R.P. (1988) Estimating primate densities from transects in a west African rain forest: a comparison of techniques. Journal of Animal Ecology, 57, 345–367.CrossRefGoogle Scholar
Wilkie, D.S., Sidle, J.G. & Boundzanga, G.C. (1992) Mechanized logging, market hunting and a bank loan in Congo. Conservation Biology, 6, 570–580.CrossRefGoogle Scholar
Williamson, E. & Usongo, L. (1996) Gorilla survey in the Dja Reserve, Cameroun. Gorilla Conservation News, 10, 9–10.Google Scholar
Yamagiwa, J., Mwanza, N., Spangenberg, A., Maruhashi, T., Yumoto, T., Fischer, A. & Steinhauer-Burkart, B. (1993) A census of the eastern lowland gorillas Gorilla g. graueri in Kahuzi-Biega National Park with reference to mountain gorillas G. g. beringei in the Virunga Region, Zaire. Biological Conservation, 64, 83–89.CrossRefGoogle Scholar