Abstract
Mountain gorillas are highly folivorous. Food is abundant and perennially available in much of their habitat. Still, limited research has shown that single gorilla groups heavily used areas where food biomass and quality were relatively high and where they met daily nutritional needs with relatively low foraging effort. Also, ecological factors influenced solitary males less than groups with females. Long-term data on habitat use by multiple mountain gorilla social units and more extensive data on variation in food distribution, presented here, confirm that food distribution influences areal occupation densities across groups and over time. These data also confirm the group/solitary male distinction and show that food distribution became more important for one male once he acquired females. Groups used ≤25 km 2 , and inter-annual home range and core area overlap was often low. Annual home range and core area size varied considerably within groups and across years. It bore no simple relationship to group size and estimated group biomass. Core areas were biased samples of total home ranges and were relatively good foraging areas. One group abruptly shifted its home range in response to male mating competition. Home ranges of two others expanded from 1981 to 1987, though at a decreasing rate. Data on one such group, which varied considerably in size, are consistent with arguments that costs of scramble competition are low except in unusually large groups. Low site fidelity, low scramble costs, and high home range overlap should decrease the ecological costs of female transfer.
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REFERENCES
Altmann, J. A. (1983). Costs of reproduction in baboons. In Aspey, W. P., and Lustick, S. I. (eds.), Behavioral Energetics, Ohio State University Press, Columbus, pp. 68–87.
Altmann, S. A. (1974). Baboons, space, time, and energy. Am. Zool. 14: 221–248.
Altmann, S. A., (1987). The impact of locomotor energetics on mammalian foraging. J. Zool. Lond. 211: 215–225.
Altmann, S. A., and Altmann, J. (1970). Baboon Ecology, University of Chicago Press, Chicago.
Barton, R. A., Whiten, A., Strum, S. C., Byrne, R. W., and Simpson, A. J. (1992). Habitat use and resource availability in baboons. Anim. Behav. 43: 831–844.
Bell, W. J. (1991). Searching Behavior, Chapman and Hall, New York.
Bennet, E. L. (1986). Ecological correlates of ranging behavior in the banded langur, Presbytis melalophos. Folia Primatol. 47: 26–38.
Bronikowski, A. M., and Altmann, J. A. (1996). Foraging in a variable environment: Weather patterns and the behavioral ecology of baboons. Behav. Ecol. Sociobiol. 39: 11–25.
Chapman, C. A. (1989). Patterns of foraging and ranging by three species of neotropical primates. Primates 29: 177–194.
Clutton-Brock, T. H. (1975). Ranging behaviour of red colobus (Colobus badius tephrosceles) in the Gombe National Park. Anim. Behav. 23: 706–722.
Clutton-Brock, T. H., and Harvey, P. H. (1977). Primate ecology and social organisation. J. Zool. (Lond.) 183: 1–39.
Clutton-Brock, T. H., and Harvey, P. (1981). Primate home range size and metabolic needs. Behav. Ecol. Sociobiol. 8: 151–155.
Cowlishaw, G. (1997). Tradeoffs between foraging and predation risks determine habitat use in a desert baboon population. Anim. Behav. 53: 667–686.
Da Silva, G. (1992). The western black-and-white colobus as a low energy strategist: Activity budgets, energy expenditure, and energy intake. J. Anim. Ecol. 61: 79–91.
Doran, D. M. and MacNeilage, A. J. (1998). Variation in behavior of gorilla subspecies: What's diet got to do with it? Evol. Anthropol. 6: 120–131.
Fossey, D. (1974). Observations on the home range of one group of mountain gorillas (Gorilla gorilla beringei). Anim. Behav. 22: 568–581.
Fossey, D., and Harcourt, A. H. (1977). Feeding ecology of free-ranging mountain gorilla (Gorilla gorilla beringei). In Clutton-Brock, T. H. (ed.), Primate Ecology, Academic Press, London, pp. 415–448.
Funston, P. J., Skinner, J. D., and Dott, H. M. (1994). Seasonal variation in movement patterns, home range, and habitat selection of buffalo in a semi-arid environment. Afr. J. Ecol. 32: 100–114.
Goodall, A. (1977). Feeding and ranging behavior of a mountain gorilla group (Gorilla gorilla beringei) in the Tshibinda-Kahuzi region, Zaire. In Clutton-Brock, T. H. (ed.), Primate Ecology, Academic Press, London, pp. 449–479.
Hemingway, C. A. (1996). Morphology and phenology of seeds and whole fruit eaten by Milne-Edwards sifaka, Propithecus diadema edwardsi, in Ranomafana National Park, Madagascar. Int. J. Primatol. 17: 637–660.
Isbell, L. (1983). Daily ranging behavior of red colobus (Colobus badius tephrosceles) in Kibale Forest, Uganda. Folia Primatol. 41: 34–48.
Isbell, L., and Van Vuren, D. (1996). Differential costs of locational and social dispersal and their consequences for female group-living primates. Behaviour 133: 1–36.
Janson, C. H., and Goldsmith, M. (1995). Predicting group size in primates: Foraging costs and predation risk. Behav. Ecol. 6: 326–336.
Janson, C. and van Schaik, C. P. (1988). Recognizing the many faces of primate food competition: Methods. Behaviour 105: 165–186.
Kuroda, S., Nishihara, T., Suzuki, S., and Oko, R. A. (1996). Sympatric gorillas and chimpanzees in the Ndoki Forest, Congo. In McGrew, W. C., Marchant, L. F., and Nishida, T. (eds.), Great Ape Societies, Cambridge University Press, Cambridge, pp. 71–81.
MacNaughton, S. J., and Banyikwa, F. F. (1995). Plant communities and herbivory. In Sinclair, A. R. E., and Arcese, P. (eds.), Serengeti II: Dynamics, Management, and Conservation of an Ecosystem. University of Chicago Press, Chicago, pp. 49–70.
McNeilage, A. R. (1995). Mountain Gorillas in the Virunga Volcanos: Feeding Ecology and Carrying Capacity, Ph.D. dissertation, University of Bristol, Bristol.
Maisels, F., Gautier-Hion, A., and Gautier, J. P. (1994). Diet of two sympatric colobines in Zaire: More evidence of seed eating in forests on poor soils. Int. J. Primatol. 15: 681–702.
Marsh, C. (1981). Ranging behaviour and its relation to diet selection in the Tana river red colobus (Colobus badius rufomitratus). J. Zool. London 195: 473–492.
Milton, K. (1979). Factors influencing leaf choice by howler monkeys: A test of some hypotheses of food selection by generalist herbivores. Am. Nat. 117: 476–495.
Milton, K. (1980). The Foraging Strategy of Howler Monkeys, Columbia University Press, New York.
Nagy, K. M., and Milton, K. (1981). Energy metabolism and food consumption by wild howler monkeys. Ecology 60: 475–480.
Olejniczak, C. (1994). Report on pilot study of western lowland gorillas at Mbeli Bai, Nouabala-Ndoki Reserve, northern Congo. Gorilla Conserv. News 8: 9–11.
Oluput, W., Waser, P., Chapman, C. A., and Isibirye-Basuta, G. (1997). Mangabey (Cercocebus albigena) ranging patterns in relation to fruit availability and the risk of parasite infection. Am. J. Primatol. 43: 65–78.
Plumptre, A. J. (1993). The effects of trampling damage by herbivores on the vegetation of the Parc National des Volcans, Rwanda. Afr. J. Ecol. 32: 115–129.
Plumptre, A. J. (1995). The chemical composition of montane plants and its influence on the diet of the large mammalian herbivores in the Park National des Volcans, Rwanda. J. Zool. Lond. 235: 323–337.
Post, D. (1978). Feeding and Ranging Behavior of the Yellow Baboon, Unpublished Ph.D. thesis, Yale University, New Haven, CT.
Pyke, G. H., Pulliam, H. R., and Charnov, E. L. (1977). Optimal foraging: A selective review of theory and tests. Q. Rev. Biol. 52: 137–154.
Remis, M. (1994). Feeding Ecology and Positional Behavior of Western Lowland Gorillas (Gorilla gorilla gorilla) in the Central African Republic, Ph.D. thesis, Yale University, New Haven CT.
Schmidt-Nielson, K. (1975). Problems of scaling: Locomotion and physiological correlates. In Pedley, T. J. (ed.), Scale Effects in Animal Locomotion, Academic Press, London, pp. 1–21.
Sommer, V. (1988). Male competition and coalitions in langurs (Presbytis entellus) at Jodhpur, Rajasthan, India. Hum. Evol. 3: 261–278.
Sterck, E. A. (1997). Determinants of female dispersal in Thomas langurs. Am. J. Primatol. 42: 178–198.
Sterck, E. A., Watts, D. P., and van Schaik, C. P. (1997). The evolution of female social relationships in primates. Behav. Ecol. Sociobiol. 41: 291–310.
Stoner, K. E. (1996). Habitat selection and seasonal patterns of activity and foraging of mantled howling monkeys (Alouatta palliata) in northeastern Costa Rica. Int. J. Primatol. 17: 1–30.
Struhsaker, T. T., Lwanga, J. S., and Kasenene, J. M. (1996). Elephants, selective logging, and forest regeneration in the Kibale Forest, Uganda. J. Trop. Ecol. 12: 45–64.
Taylor, R. (1977). The energetics of terrestrial locomotion and body size in vertebrates. In Pedley, T. J. (ed.), Scale Effects in Animal Locomotion, Academic Press, London, pp. 127–141.
Terborgh, J. (1983). Five New World Primates. Princeton, Princeton University Press, Princeton, NJ.
Terborgh, J., and van Schaik, C. P. (1987). Convergence vs. nonconvergence in primate communities. In Gee, J. H. R. and Giller, P. S. (eds.), Organization of Communities Past and Present, Blackwell, London, pp. 205–226.
Tutin, C. E. G. (1996). Ranging and social structure of lowland gorillas in the Lope Reserve, Gabon. In McGrew, W. C., Marchant, L. F., and Nishida, T. (eds.), Great Ape Societies, Cambridge University Press, Cambridge, pp. 58–70.
Tutin, C. E. G., Fernandez, M., Rogers, M. E., Williamson, E. L., and McGrew, W. C. (1991). Foraging profiles of sympatric gorillas and chimpanzees in the Lope Reserve, Gabon. Phil. Trans. Roy. Soc. Lond. Ser. B 334: 179–186.
van Schaik, C. P. (1989). The ecology of social relationships amongst female primates. In Standen, V., and Foley, R. A. (eds.), Comparative Socioecology, Blackwell, Oxford, pp. 195–218.
Vedder, A. L. (1984). Movement patterns of a group of free-ranging mountain gorillas (Gorilla gorilla beringei) and their relation to food availability. Am. J. Primatol. 7: 73–88.
Waser, P. A. (1977). Feeding, ranging, and group size of the mangabey, Cercocebus albigena, in the Kibale Forest, Uganda. In Clutton-Brock, T. H. (ed.), Primate Ecology, Academic Press, New York, pp. 317–346.
Waterman, P. G. and Kool, K. (1995). Colobine food selection and food chemistry. In Davies, A. G., and Oates, J. F. (eds.), Colobine Monkeys: Their Behavior, Ecology, and Evolution, Cambridge University Press, Cambridge, pp. 251–284.
Watts, D. P. (1984). Composition and variability of mountain gorilla diets in the central Virungas. Am. J. Primatol. 7: 323–356.
Watts, D. P. (1987). The influence of mountain gorilla foraging activities on the productivity of their food species. Afr. J. Ecol. 25: 155–163.
Watts, D. P. (1988). Environmental influences on mountain gorilla time budgets. Am. J. Primatol. 15: 295–312.
Watts, D. P. (1989). Infanticide in mountain gorillas: New cases and a reconsideration of the evidence. Ethology 81: 1–18.
Watts, D. P. (1991a). Strategies of habitat use by mountain gorillas. Folia Primatol. 56: 1–16.
Watts, D. P. (1991b). Harassment of immigrant female mountain gorillas by resident females. Ethology 89: 135–153.
Watts, D. P. (1994). The influence of male mating strategies on habitat use in mountain gorillas (Gorilla gorilla beringei). Primates 35: 35–47.
Watts, D. P. (1996). Comparative socioecology of gorillas. In McGrew, W. C., Marchant, L. F., and Nishida, T. (eds.), Great Ape Societies, Cambridge University Press, Cambridge, pp. 16–28.
Watts, D. P. (1998). Seasonality in the ecology and life histories of mountain gorillas (Gorilla gorilla beringei). Int. J. Primatol (in press).
Weber, A. W., and Vedder, A. L. (1983). Population dynamics of the Virunga gorillas, 1959–1978. Biol. Conserv. 26: 341–366.
Westoby, M. (1974). An analysis of diet selection by large generalist herbivores. Am. Nat. 108: 290–303.
Wilkinson, L., Hill, M., and Vang, E. (1992). SYSTAT Statistics, Systat, Evansville, IN.
Williamson, E. A., Tutin, C. E. G., Rogers, M. E., and Fernandez, M. (1990). Composition of the diet of lowland gorillas at Lope in Gabon. Am. J. Primatol. 21: 265–277.
Wrangham, R. W. (1979). On the evolution of ape social systems. Soc. Sci. Info. 18: 335–368.
Wrangham, R. W., and Smuts, B. B. (1980). Sex differences in the behavioral ecology of chimpanzees. J. Reprod. Fertil. Suppl. 28: 13–31.
Yamagiwa, J. (1986). Activity rhythm and the ranging of a solitary male mountain gorilla (Gorilla gorilla beringei). Primates 27: 273–282.
Yamagiwa, J. (1987). Intra-and inter-group interactions of an all male group of Virunga mountain gorillas (G. g. beringei). Primates 28: 1–30.
Yamagiwa, J., and Mwanza, M. (1994). Day journey length and daily diet of solitary male gorillas in lowland and highland habitats. Int. J. Primatol. 15: 207–224.
Yamagiwa, J., Maruhashi, T., Yumoto, T., and Mwanza, M. (1996). Dietary and ranging overlap in sympatric gorillas and chimpanzees in Kahuzi-Biega National Park, Zaire. In McGrew, W. C., Marchant, L. F., and Nishida, T. (eds.), Great Ape Societies. Cambridge University Press, Cambridge, pp. 82–100.
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Watts, D.P. Long-Term Habitat Use by Mountain Gorillas (Gorilla gorilla beringei). 1. Consistency, Variation, and Home Range Size and Stability. International Journal of Primatology 19, 651–680 (1998). https://doi.org/10.1023/A:1020324909101
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DOI: https://doi.org/10.1023/A:1020324909101