Nest building by lowland gorillas in the Lopé Reserve, Gabon: Environmental influences and implications for censusing
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We analyzed data from 373 fresh nest-sites (containing 2435 nests) of lowland gorillas (Gorilla g. gorilla)during a 4-year period in the Lopé Reserve, Gabon, to determine whether the observed variability in nest building was due to environmental influences. We recognized and defined seven types of nest in terms of the degree of construction and the raw materials used. Overall, nests built on the ground from herbaceous plants are the most common type (40%), followed by tree nests (35%). Frequencies of the different nest-types vary significantly between eight habitat-types. In habitat-types with high densities of understory herbs, ground nests predominated, but when herbs were rare, the majority of nests were in trees. A general preference for sleeping in herbaceous ground nests is indicated since trees are abundant in all habitat-types, except savanna. The frequency of nesting in trees shows a significant positive correlation with rainfall, but effects of climate are confounded by seasonal variation in use of different habitat-types. When elephants were attracted to the same localized food sources as gorillas, many tree nests were built even when herbs were available. We conclude that different nest-types reflect a variety of solutions to maximize comfort, depending on available raw materials and the probability of rainfall or disturbance by elephants or both factors. Nests are a powerful tool for population censuses and demographic studies of great apes, but problems exist in interpreting data on lowland gorilla nests. Results from this analysis show that only a third of nest-sites accurately reflects group size (of weaned individuals) and that 26% of all gorilla nest-sites could be mistaken for those of chimpanzees, as all nests, or all those visible from a transect, were in trees. Gorilla nests at Lopé were nonrandomly distributed with respect to habitat-types, and nest construction varied seasonally, thereby introducing sources of bias to transect nest counts. We discuss these problems and ones related to assessing the decay rate of nest-sites and make recommendations relevant to census work.
- Anderson, J. R. (1984). Ethology and ecology of sleep in monkeys and apes.Adv. Study Behav. 14: 165–229. CrossRef
- Aubreville, A. (1967). Les étranges mosaiques forêt-savane du sommet de la boucle de l’Ogooué au Gabon.Adansonia Ser. 2 7: 13–22.
- Aveling, G, and Harcourt, A. H. (1984). A census of the Virunga gorillas.Oryx 18: 8–13. CrossRef
- Baldwin, P. J., Sabater Pi, J., McGrew, W. C., and Tutin, G. E. G. (1981). Comparisons of nests made by different populations of chimpanzees(Pan troglodytes).Primates 22: 474–486. CrossRef
- Barnes, R. F. W., Blom, A., Alers, M. P. T., and Barnes, K. L., (1995). An estimate of the number of forest elephants in Gabon.J. Trop. Ecol. 11: 27–37. CrossRef
- Bernstein, I. S. (1962). Response to nesting materials of wild born and captive born chimpanzees.Anim. Behav. 10: 1–6. CrossRef
- Bernstein, I. S. (1969). A comparison of nesting patterns among the three Great Apes. In Bourne, G. H. (ed.),The Chimpanzee, Vol. 1, Karger, Basel, pp. 393–402.
- Buckland, S. T., Anderson, D. R., Burnham, K. P., and Laake, J. L. (1993).Distance Sampling: Estimating Abundance of Biological Populations, Chapman and Hall, London. CrossRef
- Burnham, K. P., Anderson, D. R., and Laake, J. L. (1980). Estimation of density from line transect sampling of biological populations.Wildlife Monogr. 72: 1–202.
- Casimir, M. J. (1979). An analysis of gorilla nesting sites of the Mt. Kahuzi region (Zaire).Folia Primatol. 32: 290–298. CrossRef
- de Foresta, H. (1990). Origine et evolution des savannes intramayombiennes (R. P. du Congo) II. Apports de Botanique Forestiére. In Lanfranchi, R., and Schwartz, D. (eds.),Paysages Quaternaire de l’Afrique Centrale Atlantique, ORSTOM, Paris, pp. 326–335.
- Dixson, A. F. (1981).The Natural History of the Gorilla, Weidenfeld and Nicolson, London.
- Florence, J. (1981).Chablis et sylvigénèse dans une forêt dense humide sempervirente du Gabon, Thèse dy 3ème cycle, Université Louis Pasteur, Strasbourg.
- Fossey, D., and Harcourt, A. H. (1977). Feeding ecology of free-ranging mountain gorilla(Gorilla gorilla beringet). In Clutton-Brock, T. H. (ed.),Primate Ecology, Academic Press, London, pp. 415–447.
- Goodall, J. van Lawick (1968). The behaviour of free-living chimpanzees in the Gombe Stream Reserve.Anim. Behav. Monogr. 1(3): 161–311. CrossRef
- Groves, C. P., and Sabater Pi, J. (1985). From ape’s nest to human fix-point.Man 20: 22–47. CrossRef
- Harcourt, A. H., and Fossey, D. (1981). The Virunga gorillas: Decline of an “island” population.Afr. J. Ecol. 19: 83–97. CrossRef
- Harcourt, A. H., and Groom, A. F. G. (1972). Gorilla census.Oryx 11: 355–363. CrossRef
- Letouzey, R. (1968).Etude Pnytogéographique du Cameroun, Encyclopédie Biologique No. 69, Editions Paul Lechevalier, Paris.
- Rogers, M. E., and Williamson, E. A. (1987). Density of herbaceous plants eaten by gorillas in Gabon: Some preliminary data.Biotropica 19: 278–281. CrossRef
- Schaller, G. B. (1963).The Mountain Gorilla: Ecology and Behavior, University of Chicago Press, Chicago.
- Tutin, G. E. G. and Benirschke, K. (1991). Possible osteomyelitis of skull causes death of a wild lowland gorilla in the Lopé Reserve, Gabon.J. Med. Primatol. 20: 357–360.
- Tutin, G. E. G., and Fernandez, M. (1984). Nationwise census of gorilla(Gorilla g. gorilla) and chimpanzee(Pan. t. troglodytes) populations in Gabon.Am. J. Primatol. 6: 313–336. CrossRef
- Tutin, G. E. G., and Fernandez, M. (1993a). Composition of the diet of chimpanzees and comparisons with that of sympatric lowland gorillas in the Lopé Reserve, Gabon.Am. J. Primatol 30: 195–211. CrossRef
- Tutin, C. E. G., and Fernandez, M. (1993b). Relationships between minimum temperature and fruit production in some tropical forest trees in Gabon.J. Trop. Ecol. 9: 241–248. CrossRef
- Tutin, C. E. G., Fernandez, M., Rogers, M. E., Williamson, E. A., and McGrew, W. C. (1991). Foraging profiles of sympatric lowland gorillas and chimpanzees in the Lopé Reserve Gabon.Phil. Trans. R. Soc. Lond. B 334: 179–186. CrossRef
- Tutin, C. E. G., Fernandez, M., Rogers, M. E., and Williamson, E. A. (1992). A preliminary analysis of the social structure of lowland gorillas in the Lopé Reserve, Gabon. In Itoigawa, N., Sugiyama, Y., Sackett, G. P., and Thompson, R. K. R. (eds.),Topics in Primatology, Vol. 2, University of Tokyo Press, Tokyo, pp. 245–254.
- Tutin, C. E. G., White, L. J. T., Williamson, E. A., Fernandez, M., and McPherson, G. (1994). List of plant species identified in the northern part of the Lopé Reserve, Gabon.Tropics 3: 249–276. CrossRef
- Weber, A. W., and Vedder, A. (1983). Population dynamics of the Virunga gorillas 1959–1978.Biol. Conserv. 26: 341–366. CrossRef
- White, L. J. T. (1992).Vegetation History and Logging Disturbance: Effects on Rain Forest Mammals in the Lopé Reserve, Gabon (with Special Emphasis on Elephants and Apes), Ph.D. thesis, University of Edinburgh, Edinburgh.
- White, L. J. T. W., Tutin, C. E. G., and Fernandez, M. (1993). Group composition and diet of forest elephants,Loxodonta africana cyclotis, Matschie 1900, in the Lopé Reserve, Gabon.Afr. J. Ecol. 31: 181–199. CrossRef
- White, L. J. T., Rogers, M. E. Tutin, C. E. G., Williamson, E. A., and Fernandez, M. (1995). Herbaceous vegetation in different forest types in the Lopé Reserve, Gabon: Implications for keystone food availability.Afr. J. Ecol. (in press).
- Williamson, E. A., Tutin, C. E. G., Rogers, M. E., and Fernandez, M. (1990). Composition of the diet of lowland gorillas at Lopé in Gabon.Am. J. Primatol. 21: 265–277. CrossRef
- Yamagiwa, J., Mwanza, N., Spangenberg, A., Maruhashi, T., Yumoto, T., Fischer, A. and Steinhauer-Burkart, B. (1993). A census of the eastern lowland gorillasGorilla gorilla grauen in Kahuzi-Biega National Park with reference to mountain gorillasG. g. beringei in the Virunga Region, Zaire.Biol. Conserv. 64: 83–89. CrossRef
- Nest building by lowland gorillas in the Lopé Reserve, Gabon: Environmental influences and implications for censusing
International Journal of Primatology
Volume 16, Issue 1 , pp 53-76
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- Gorilla g. gorilla
- census methods
- Author Affiliations
- 1. Centre International de Recherches Médicales de Franceville, Gabon and Department of Biological and Molecular Sciences, University of Stirling, Stirling, Scotland
- 3. The Wildlife Conservation Society and ICAPB, University of Edinburgh, Edinburgh, Scotland