Tree structure and sex differences in arboreality among western lowland gorillas (Gorilla gorilla gorilla) at Bai Hokou, Central African Republic
- Melissa J. Remis
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The aim of six months of research in 1995 on the gorillas (Gorilla gorilla gorilla) at Bai Hokou, Central African Republic, was to study the effects of tree structure, relative numbers of arboreal feeding sites, and sex differences in body size on arboreal foraging. The analysis presented here also documents inter-annual variation in fruit availability and climbing by silverback gorillas by comparing the 1995 results to those from earlier research, 1990–1992. This analysis suggests that female gorillas maintain similar levels of arboreality in fruit-rich and fruit-poor seasons and years, but silverbacks may be more terrestrial when fruit is scarce or difficult to access. Trees of different shapes present different numbers of feeding sites to bigger males and smaller females. Male climbing is affected by the availability of fruit, and small trees with narrow crowns that lend easy access to fruit from the core. This study suggests that the energetics of vertical climbing and biomechanical constraints imposed by small branch feeding sites in the periphery of trees may constrain the arboreal behavior of male gorillas. Fine-tuned comparisons of food availability, tree structure, and variation in social context of behavior across habitats, will assist efforts to understand differences in ecology among populations and species of African apes.
Cant, J. G. H. 1987. Effects of sexual dimorphism in body size on feeding postural behavior of Sumatran orangutans (Pongo pygmaeus).Amer. J. Phys. Anthropol., 74: 143–148.CrossRef
Cant, J. G. H. 1992. Positional behavior and body size of arboreal primates: a theoretical framework for field studies and an illustration of its application.Amer. J. Phys. Anthropol., 88: 273–283.CrossRef
Cartmill, M. 1974. Pads and claws in arboreal locomotion. In:Primate Locomotion,Jenkins,F. A.,Jr. (ed.), Academic Press, New York, pp. 45–83.
Cartmill, M.;Milton, K. 1977. The lorisform wrist joint and evolution of “brachiating” adaptations in Hominoidea.Amer. J. Phys. Anthropol., 47: 249–272.CrossRef
Chapman, C. A.;Chapman, L. J.;Wrangham, R.;Hunt, K.;Gardner, D. L. 1992. Estimators of fruit abundance of tropical trees.Biotropica, 24(4): 527–531.CrossRef
Chapman, C. A.;White, F. J.;Wrangham, R. W. 1993. Defining subgroup size in fission-fusion societiesFolia Primatol., 61: 31–34.PubMed
Demment, M. W. 1983. Feeding ecology and the evolution of body size of baboons.Afr. J. Ecol., 21: 219–233.
Doran, D. M. 1993. Sex differences in adult chimpanzee positional behavior: influence of body size on locomotion and posture.Amer. J. Phys. Anthropol., 91: 99–115.CrossRef
Doran, D. M. 1996. Comparative positional behavior of the African apes. In:Great Ape Societies,McGrew,W. C.;Marchant,L. F.;Nishida,T. (eds.), Cambridge Univ. Press, Cambridge, pp. 213–224.
Doran, D. M. 1997. The influence of seasonality on activity patterns, feeding behavior, ranging and grouping patterns in Tai chimpanzees,Int. J. Primatol., 18: 183–206.CrossRef
Doran, D. M.;Hunt, K. D. 1994. Comparative locomotor behavior of chimpanzees and bonobos: species and habitat differences. In:Chimpanzee Cultures,Wrangham,R. W.;McGrew,W. C.;de Waal,F. B. M.;Heltne,P. G. (eds.) Harvard Univ. Press, Cambridge, Massachusetts, pp. 93–108.
Fleagle, J. 1976. Locomotion and posture of Malayan siamang: implications for Hominoid evolution.Folia Primatol., 26: 245–269.PubMed
Fleagle, J. G.;Mittermeier, R. A. 1980. Locomotor behavior, body size and comparative ecology of 7 Surinam monkeys.Amer. J. Phys. Anthropol., 52: 301–314.CrossRef
Galdikas, B. M. F.;Teleki, G. 1981. Variations in subsistence activities of female and male Pongids: new perspectives on origins of Hominid labor division.Cur. Anthropol., 22(3): 241–255.CrossRef
Goldsmith, M. L. 1996. Ecological influences on the ranging and grouping behavior of western lowland gorillas at Bai Hokou, Central African Republic. Ph.D. diss. State Univ. of New York, Stony Brook, New York.
Grand, T. I. 1972. A mechanical interpretation of terminal branch feeding.J. Mammalogy, 53 (1): 198–201.CrossRef
Halle, F.;Oldeman, R. A. A.;Tomlinson, P. B. 1978.Tropical Trees and Forests: An Architectural Analysis. Springer-Verlag, Berlin.
Horn, H. S. 1971.The Adaptive Geometry of Trees, Princeton Univ. Press, Princeton.
Hunt, K. D. 1992. Social rank and body size as determinants of positional behavior inPan troglodytes.Primates, 33: 347–357.CrossRef
Hunt, K. D. 1994. Body size effects on vertical climbing among chimpanzees.Int. J. Primatol., 14: 855–865.
Jungers, W. L. (ed.), 1984. Body size and the scaling of limb proportions in primates. In:Size and Scaling in Primate Biology, Plenum, New York, pp. 345–381.
Jungers, W. L.;Susman, R. L. 1984. Body size and skeletal allometry in African apes. In:The Pygmy Chimpanzee: Evolutionary Biology and Behavior, Susman, R. L. (ed.), Plenum Press, New York, pp. 131–178.
Napier, J. R.;Napier, P. H. 1985.The Natural History of the Primates. MIT Press, Cambridge, Massachusetts.
Nishihara, T. 1995. Feeding ecology of western lowland gorillas in the Nouabale-Ndoki National Park, Congo,Primates, 36: 151–168.CrossRef
Peters, R. H.;Cloutier, S.;Dube, D.;Evans, A.;Hastings, P.;Kaiser, H.;Kohn, D.;Sarwer-Foner, B. 1988. The allometry of the weight of fruit on trees and shrubs in Barbados.Oecologia, 74: 612–616.CrossRef
Remis, M. J. 1994. Feeding ecology and positional behavior of lowland gorillas in the Central African Republic. Ph.D. thesis, Yale Univ., New Haven, Connecticut.
Remis, M. J. 1995. The effects of body size and social context on the arboreal activities of lowland gorillas in the Central African Republic.Amer. J. Phys. Anthropol., 97: 413–433.CrossRef
Remis, M. J. 1997a. The ranging and grouping patterns of a lowland gorilla group in the Central African Republic.Amer. J. Primatol., 43: 87–109.CrossRef
Remis, M. J. 1997b. Gorillas as seasonal frugivores: resources that vary in time and space.Amer. J. Primatol., 43: 111–133.CrossRef
Remis, M. J. 1998. The gorilla paradox: the effects of body size and habitat on the positional behavior of lowland and mountain gorillas. In:Primate Locomotion: Recent Advances,Strasser,E.;Fleagle,J.;Rosenberger,A.;McHenry,H. (eds.), Plenum Press, New York, pp. 95–106.
Ripley, S. 1967. The leaping of langurs: a problem in the study of locomotor adaptation.Amer. J. Phys. Anthropol., 26: 149–170.CrossRef
Ripley, S. 1976. Gray zones and gray langurs: Is the “Semi”—concept seminal?Yrbk. Phys. Anthropol., 20: 376–394.
Sokal, R. R.;Rohlf, F. J. 1981.Biometry. W. H. Freeman, New York.
Strier, K. B. 1989. Effects of patch size on feeding associations in Muriquis (Brachyteles arachnoides).Folia Primatol., 52: 70–77.PubMed
Tutin, C. E. G.;Fernandez, M. 1993. Faecal analysis as a method of describing diets of apes: examples from sympatric gorillas and chimpanzees at Lopé, Gabon.Tropics, 2 (4): 189–198.CrossRef
Tutin, C. E. G.;Fernandez, M.;Rogers, M. E.;Williamson, E. A.;McGrew, W. C. 1991. Foraging profiles of sympatric lowland gorillas and chimpanzees in the Lopé Reserve, Gabon: foraging strategies and the natural diet of monkeys, apes and humans.Philos. Trans. R. Soc. Lond. (Biol.), 334: 179–186.CrossRef
Tutin, C. E. G.;Ham, R. M.;White, L. J. T.;Harrison, M. J. S. 1997. The primate community of the Lopé Reserve, Gabon: diets, responses to fruit scarcity and effects on biomass.Amer. J. Primatol., 42: 1–24.CrossRef
Tuttle, R. H.;Watts, D. P. 1985. The positional behavior and adaptive compleces ofPan gorilla. In:Primate Morphophysiology, Locomotor Analyses and Human Bipedalism,Kondo,S. (ed.), Univ. of Tokyo Press, Tokyo, pp. 261–288.
White, F. J.;Wrangham, R. W. 1988. Feeding competition and patch size in chimpanzee speciesPan paniscus andP. troglodytes.Behaviour, 104: 148–164.
Willoughby, D. 1978.All About Gorillas, A. S. Barnes, New York.
Wrangham, R. W.;Smuts, B. B. 1980. Sex differences in the behavioral ecology of chimpanzees in the Gombe National Park, Tanzania,J. Reprod. Fertil. (suppl.), 29: 13–31.
Zihlman, A. L. 1997. Natural history of apes: life history features in females and males. In:The Evolving Female: A Life History Perspective,Morbeck,M. E.;Galloway,A.;Zihlman,A. L. (eds.), Princeton Univ. Press, Princeton, pp. 86–103.
- Tree structure and sex differences in arboreality among western lowland gorillas (Gorilla gorilla gorilla) at Bai Hokou, Central African Republic
Volume 40, Issue 2 , pp 383-396
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- Positional behavior
- Sex differences
- Fruit availability
- Melissa J. Remis (1)
- Author Affiliations
- 1. Department of Sociology and Anthropology, Purdue University, 47907-1365, West Lafayette, Indiana, USA