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An estimate of the numbers of forest elephants in Gabon

Published online by Cambridge University Press:  10 July 2009

R. F. W. Barnes*
NZYS The Wildlife Conservation Society and Department of Biology, University of California, San Diego, USA
A. Blom
NZYS The Wildlife Conservation Society
M. P. T. Alers
NZYS The Wildlife Conservation Society
K. L. Barnes
NZYS The Wildlife Conservation Society
1Department of Biology, 0116, U.C. San Diego, La Jolla, California 92093–0116, USA (tel: 619–534–8863; fax: 619-534-7108).


The number of elephants living in the forests of Gabon was estimated by a stratified dung survey. The forest zone was stratified according to the distribution of the human population. The density of dung-piles was estimated for each stratum by the line-transect method. The total number of dung-piles in the forests of Gabon was estimated to be 52.43 × 106 ± 13.25 × 106. This gave an elephant estimate of 61,800 ±20,200. This survey shows Gabon to have one of the largest elephant populations on the continent.

Research Article
Copyright © Cambridge University Press 1995

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Alers, M. P. T., Blom, S., Sikubwabo Kiyengo, C., Masunda, T. & Barnes, R. F. W. 1992. Preliminary assessment of the status of the forest elephant in Zaire. African Journal of Ecology 30:279291.Google Scholar
Anon. 1984a. Final priorities for the action plan. Pp. 1117 in Cumming, D. H. M. & Jackson, P. (eds). The status and conservation of Africa's elephants and rhinos. IUCN, Gland. 191 pp.Google Scholar
Anon. 1984b. Status and trēnd of elephant and rhino populations in Africa. Pp. 1923 in Cumming, D. H. M. & Jackson, P. (eds). The status and conservation of Africa's elephants and rhinos. IUCN, Gland. 191 pp.Google Scholar
Barnes, R. F. W. 1993. Indirect methods for counting elephants in forest. Pachyderm 16:2430.Google Scholar
Barnes, R. F. W, Agnagna, M., Alers, M. P. T., Blom, A., Doungoube, G., Fay, J. M., Masunda, T., Ndo Nkoumou, J. C., Sikubwabo Kiyengo, C. & Tchamba, M. 1993. Elephants and ivory poaching in the forests of equatorial Africa: results of a field reconnaissance. Oryx 27:2734.Google Scholar
Barnes, R. F W. & Barnes, K. L. 1992. Estimating decay rates of elephant dung-piles in forest. African Journal of Ecology 30:3163421.CrossRefGoogle Scholar
Barnes, R. F. W., Barnes, K. L., Alers, M. P. T. & Blom, A. 1991. Man determines the distribution of elephants in the rain forests of northeastern Gabon. African Journal of Ecology 29:5463.Google Scholar
Barnes, R. F. W. & Douglas-Hamilton, I. 1983. The numbers and distribution patterns of large mammals in the Ruaha-Rungwa area of southern Tanzania. Journal of Appied Ecology 19:411425.Google Scholar
Barnes, R. F. W. & Jensen, K. L. 1987. How to count elephants in forests. IUCN African Elephant and Rhino Specialist Group Technical Bulletin 1:16.Google Scholar
Barret, J. 1983. Population. Pp. 4851 in Barret, J. (ed.). Geographic et Cartographic du Gabon. EDICEF, Paris. 135 pp.Google Scholar
Bell, R. H. V. 1982. The effect of soil nutrient availability on community structure in African ecosystems. Pp. 193216 in Huntley, B. J. & Walker, B. H. (eds). Ecology of tropical savannas. Springer-Verlag, Berlin. 669 pp.CrossRefGoogle Scholar
Borner, M. & Severre, E. 1984. The Ruaha elephants. Typescript report, Tanzania National Parks.Google Scholar
Breteler, F. J. 1989. Gabon. Pp. 198202 in Campbell, D. G. & Hammond, H. D. (eds). Floristic inventory of tropical countries. The New York Botanical Garden, New York. 545 pp.Google Scholar
Burnham, K. D., Anderson, D. R. & Laake, J. 1980. Estimation of density from line transect sampling of biological populations. Wildlife Monographs 72:1201.Google Scholar
Burrill, A. & Douglas-Hamilton, I. 1987. African Elephant Database Project: Final Report. UNEP/ GRID, Nairobi. 86 pp.Google Scholar
Caballe, G. 1978. Essai phytogéographique sur la foret dense du Gabon. Annales de I'Université Nationale du Gabon 2:87101.Google Scholar
Caballe, G. 1983. Vegatation. Pp. 3437 in Barret, J. (ed.). Geógraphie et Cartographie du Gabon. EDICEF, Paris. 135 pp.Google Scholar
Carroll, R. W. 1986. Status of the lowland gorilla and other wildlife in the Dzangh-Sangha region of southwestern Central African Republic. Primate Conservation 7:3841.Google Scholar
Caughley, G. & Goddard, J. 1975. Abundance and distribution of elephants in the Luangwa Valley, Zambia. East African Wildlife Journal 13:3948.Google Scholar
Coe, M. J., Cumming, D. H. & Phillipson, J. 1976. Biomass and production of large African herbivores in relation to rainfall and primary production. Oecologia (Berlin) 22:341354.CrossRefGoogle ScholarPubMed
Craig, G. C. 1990. Present population and distribution of elephants in northern Botswana. Pp. 1618 in Hancock, P. (ed.). The future of Botswana's elephants. Kalahari Conservation Society & Department of Wildlife & National Parks, Gabarone. 96 pp.Google Scholar
Dawson, S. 1990. A model to estimate density of Asian elephants (Elephus maximus) in forest habitats. MSc Thesis, University of Oxford. 156 pp.Google Scholar
Douglas-Hamilton, I. 1987. African elephant population study. Pachyderm 8:110.Google Scholar
Douglas-Hamilton, I. 1989. Overview of status and trends of the African elephant. In Cobb, S. (ed.). The ivory trade and the future of the African elephant. International Development Centre, Oxford.Google Scholar
Douglas-Hamilton, I. & Douglas-Hamilton, O. 1992. Battle for the elephants. Viking, New York. 368 pp.Google Scholar
Dublin, H. T. & Douglas-Hamilton, I. 1987. Status and trends of elephants in the Serengeti-Mara ecosystem. African Journal of Ecology 25:1933.Google Scholar
Jachmann, H. 1991. Evaluation of four survey methods for estimating elephant densities. African Journal of Ecology 29:188195.CrossRefGoogle Scholar
Jachmann, H. & Bell, R. H. V. 1984. The use of elephant droppings in assessing numbers, occupance, and age structure: a refinement of the method. African Journal of Ecology 22:127141.Google Scholar
Johnson, C. N. & Jarman, P. J. 1987. Macropod studies at Wallaby Creek. VI. A validation of the use of dung-pellet counts for measuring absolute densities of populations of Macropodids. Australian Journal of Wildlife Research 14:139145.Google Scholar
Lahm, S. A. 1993. Ecology and economics of human/wildlife interaction in Northeastern Gabon. PhD Dissertation. New York University. 325 pp.Google Scholar
Martin, R. B. 1986. Establishment of African ivory export quotas and associated control procedures. Pp. 1100 in Martin, R. B., Caldwell, J. R. & Barzdo, J. G. (eds). African elephants, CITES and the ivory trade. CITES, Lausanne. 176 pp.Google Scholar
Martin, R. B., Craig, G. C., Booth, V. R. & Conybeare, A. M. G. 1992. Elephant management in Zimbabwe. 2nd Edition. Department of National Parks & Wild Life Management, Harare. 124 pp.Google Scholar
McClanahan, T. R. 1986. Quick population survey method using faecal droppings and a steady state assumption. African Journal of Ecology 24:3739.Google Scholar
Merz, G. 1986. Counting elephants (Loxodonta qfricana cyclotis) in tropical rain forests with particular reference to the Tai National Park, Ivory Coast. African Journal of Ecology 24:6168.Google Scholar
Michelmore, F., Beardsley, K., Barnes, R. F. W. & Douglas-Hamilton, I. 1994. A model illustrating the changes in forest elephant numbers caused by poaching. African Journal of Ecology 32:8999.Google Scholar
Neff, D. J. 1986. The pellet-group count technique for big game trend, census, and distribution. Journal of Wildlife Management 32:597614.CrossRefGoogle Scholar
Norton-Griffiths, M. 1975. The numbers and distributions of large mammals in Ruaha National Park, Tanzania. East African Wildlife Journal 13:121140.Google Scholar
Norton-Griffiths, M. 1978. Counting animals. 2nd Edition. African Wildlife Foundation, Nairobi. 139 pp.Google Scholar
Ottichilo, W. K. 1986. Population estimates and distribution patterns of elephants in the Tsavo ecosystem, Kenya, in 1980. African Journal of Ecology 24:5357.CrossRefGoogle Scholar
Ottichilo, W. K., Kufwafwa, J. W. & Stelfox, J. G. 1987. Elephant population trends in Kenya: 1977–81. African Journal of Ecology 25:918.CrossRefGoogle Scholar
Pfeffer, P. 1990. Estimations actuelles des populations d'elephants d'Afrique. Le Courrier de la Nature 126:3035.Google Scholar
Reitsma, J. M. 1988. Vegetation forestiere du Gabon/Forest vegetation of Gabon. Tropenbos Technical Series, Ede, The Netherlands 1:1142.Google Scholar
Rogers, D. J. & Randolph, S. E. 1986. Distribution and abundance of tsetse flies. Journal of Animal Ecology 55:10071025.Google Scholar
Short, J. C. 1983. Density and seasonal movements of forest elephant (Loxodonta africana cyclotis, Matschie) in Bia National Park, Ghana. African Journal of Ecology 21:175184.CrossRefGoogle Scholar
Staines, B. W. & Ratcliffe, P. R. 1987. Estimating the abundance of red deer (Cervus elaphus L.) and roe deer (Capreolus capreolus L.) and their current status in Great Britain. Symposia of the Zoological Society of London 50:131152.Google Scholar
Sukumar, R., Surendra Varman, K., Santosh, J. A. & Ramakrishnan, U. 1991. Methods of estimating elephant numbers: a review. Pp. 229 in Ramakrishnan, U., Santosh, J. A. & Sukumar, R. (eds). Proceedings of the Mudumalai Workshop on Censusing Elephants in Forests. Asian Elephant Conservation Centre, Bangalore, India. 92 pp.Google Scholar
Tchamba, M. 1992. Defecation by the African forest elephant (Loxodonta africana cyclotis) in the Santchou Reserve, Cameroun. Mammalia 56:155158.Google Scholar
Tutin, C. E. G. 1992. Gabon. Pp. 168174 in Saver, J. A., Harcourt, C. S. & Collins, N. M. (eds). The conservation atlas of tropical forests: Africa. Macmillan, UK. 288 pp.Google Scholar
Tutin, C. E. G. & Fernandez, M. 1984. Nationwide census of gorilla (Gorilla g. gorilla) and chimpanzee (Pan t. troglodytes) populations in Gabon. American Journal of Primatology 6:313336.Google Scholar
White, F. 1983. The vegetation of Africa. UNESCO, Paris. 356 pp.Google Scholar
Wilks, C. 1990. Conservation el Utilisation Rationelle des Ecosystemes Forestiers en Afrique Centrale: Gabon. IUCN, Gland. 215 pp.Google Scholar
World Bank. 1986. Population growth and policies in sub-Saharan Africa. The World Bank, Washington. 102 pp.Google Scholar