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Gorilla diet in the Lopé Reserve, Gabon:

A nutritional analysis

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Summary

The results of an analysis of gorilla diet in the Lopé Reserve, Gabon are presented. Samples were assayed for nutrients and plant secondary compounds (total phenols, condensed tannins and alkaloids) in an attempt to explain gorilla food choice. The diet is the most diverse so far analysed for gorillas; it seems to be a balance between sugary fruit, proteinaceous leaves, and relatively fibrous stems. Most fruits and herbaceous stems are succulent, but some drier, fibrous fruit and bark is also consumed. Seeds are another component of the diet, including unripe ones. Fruit, seeds, leaves and bark may all contain very high levels of total phenols and condensed tannins; but all herbaceous stems assayed contain low levels of these compounds. Alkaloids are not apparently a significant component of gorilla foods, and may be avoided. Gorillas at Lopé tend to avoid fatty fruit, and select leaves which are high in protein and low in fibre compared to the general vegetation. When fruit and preferred young leaves are scarce, proteinaceous barks and mature leaves, and sugary pith, are important sources of nutrients. We conclude that gorillas exploit the broad frugivore niche in West African lowland forests, and are part of the frugivore community there. What distinguishes them is their ability to eat large fibrous fruit, mature leaves and stems, and to overcome high levels of phenolics (we use “phenolics” as an umbrella term for both total phenols and condensed tannins). Gorilla diet at Lopé overlaps greatly with that of sympatric, frugivorous, primates, and resembles more closely that of chimpanzees than it does gorilla diet studied elsewhere in Africa.

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References

  • Allen SE, Grimshaw HM, Parkinson JA, Quarnby C (1974) Chemical analysis of ecological materials. Blackwell Scientific Publications, Oxford

    Google Scholar 

  • Arnold GW, Hill JL (1972) Chemical factors affecting selection of food plants by ruminants. In: Harborne JB (ed) Phytochemical Ecology. Academic Press, London New York, pp 71–101

    Google Scholar 

  • Association of Official Analytical Chemists (1984) Official methods of analysis of the AOAC. Williams S. (ed). Arlington, VA, USA

  • Bell RHV (1971) A grazing system in the Serengeti. Sci Am 225:86–93

    Google Scholar 

  • Calvert JJ (1985) Food selection by western gorillas (G.g. gorilla) in relation to food chemistry. Oecologia 65:236–246

    Google Scholar 

  • Casimir MJ (1975) Feeding ecology and nutrition of an eastern gorilla group in the Mt. Kahuzi region (Républ. du Zaire). Folia Primat 24 (2–3):81–136

    Google Scholar 

  • Chivers DJ (1989) Adaptations of digestive systems in non-ruminant herbivores. Proc Nutrit Soc 48:59–67

    Google Scholar 

  • Collet J-Y, Bourreau E, Cooper RW, Tutin CEG, Fernandez M (1984) Experimental demonstration of cellulose digestion by Troglodytella gorillae, an intestinal ciliate of lowland gorillas. Int J Primatol 5:328

    Google Scholar 

  • Crooke WM, Simpson WE (1971) Determination of ammonium in kjeldahl digests of crops using an automated procedure. J Sci Fd Agric 22:9–10

    Google Scholar 

  • Demment MW, Van Soest PJ (1985) A nutritional explanation for body size patterns of ruminant and non-ruminant herbivores. Am Nat 125(5):641–672

    Google Scholar 

  • Emmons LH, Gautier-Hion A, Dubost G (1983) Community structure of the frugivorous-folivorous forest mammals of Gabon. J Zool 199:209–222

    Google Scholar 

  • Fay JM (1989) Partial completion of a census of the western lowland gorilla (Gorilla g. gorilla (Savage and Wyman)) in southwestern Central African Republic. Mammalia 53:203–215

    Google Scholar 

  • Fossey D, Harcourt AH (1977) Feeding ecology of free-ranging mountain gorilla (Gorilla gorilla beringei). In: Clutton-Brock TH (ed) Primate Ecology. Academic Press, London

    Google Scholar 

  • Freeland WJ, Janzen DH (1974) Strategies of herbivory by mammals: the role of plant secondary compounds. Am Nat 108:269–289

    Google Scholar 

  • Gaulin SJC (1979) A Jarman/Bell model of primate feeding niches. Human Ecol 7:1–20

    Google Scholar 

  • Gaulin SJC, Konner M (1977) On the natural diet of primates, including humans. In: Wurtman RJ, Wurtman JJ (eds) Nutrition and the Brain, vol 1. Raven Press, New York, pp 1–86

    Google Scholar 

  • Gautier-Hion A (1983) Leaf consumption by monkeys in western and eastern Africa: a comparison. Afr J Ecol 21:107–113

    Google Scholar 

  • Gautier-Hion A, Duplantier J-M, Quris R, Feer F, Sourd C, Decoux J-P, Dubost G, Emmons LH, Erard C, Hecketsweiler P, Moungazi A, Roussilhon C, Thiollay J-M (1985) Fruit characters as a basis of fruit choice and seed dispersal in a tropical forest vertebrate community. Oecologia 65:324–337

    Google Scholar 

  • Goering HK, Van Soest PJ (1970) Forage fibre analysis: Apparatus, reagents, procedures and some applications. US Dept Agric Handb 379, ARS Washington, DC

  • Goodall AG (1977) Feeding and ranging behaviour of a mountain gorilla group (Gorilla gorilla beringei) in the Tshibinda-Kahuzi region (Zaire). In: Clutton-Brock TH (ed) Primate Ecology, Academic Press, London, pp 449–479

    Google Scholar 

  • Harcourt AH, Stewart KJ (1978) Coprophagy by wild mountain gorilla. E Afr Wildl J 16:223–225

    Google Scholar 

  • Harrison MJS (1986) Feeding ecology of black colobus, Colobus satanas, in central Gabon. In: Else JG, Lee PC (eds) Primate Ecology and Conservation, Cambridge University Press, pp 31–37

  • Harrison MJS (1990) Floristics and phytochemistry in a Gabonese rain forest, and the influence of leaf chemistry on population biomass of the black colobus monkey (Colobus satanas). Biol J Linn Soc (in press)

  • Hoshino J (1985) Feeding ecology of mandrills (Mandrillus sphinx) in Campo Animal Reserve, Cameroon. Primates 26:248–273

    Google Scholar 

  • Janzen DH (1975) Ecology of plants in the tropics. Edward Arnold, London

    Google Scholar 

  • Jarman PJ (1974) The social organisation of antelope in relation to their ecology. Behaviour 48:215–267

    Google Scholar 

  • Jones C, Sabater Pi J (1971) Comparative ecology of Gorilla gorilla (Savage & Wyman) and Pan troglodytes (Blumenbach) in Rio Muni, West Africa. Bibl Primatol 13:1–96

    Google Scholar 

  • Lahm SA (1986) Diet and habitat preferences of Mandrillus sphinx in Gabon: implications of foraging strategy. Am J Primatol 11:9–26

    Google Scholar 

  • McDonald P, Henderson AR (1964) Determination of water-soluble carbohydrates in grass. J Sci Fd Agric 15:395–398

    Google Scholar 

  • McKey DB, Gartlan JS, Waterman PG, Choo GM (1981) Food selection by black colobus monkeys (Colobus satanas) in relation to plant chemistry. Biol J Linn Soc 16:115–146

    Google Scholar 

  • Milton K (1979) Factors influencing leaf choice by howler monkeys: A test of some hypotheses of leaf selection by generalist herbivores. Am Nat 114:362–378

    Google Scholar 

  • Milton K (1984) The role of food-processing factors in primate food choice. In: Rodman PS, Cant JGH (eds) Adaptations for foraging in nonhuman primates, Columbia University Press, New York, pp 249–279

    Google Scholar 

  • Mole S, Waterman PG (1987a) A critical analysis of techniques for measuring tannins in ecological studies, I. Techniques for chemically defining tannins. Oecologia 72:137–147

    Google Scholar 

  • Mole S, Waterman PG (1987b) Tannins as antifeedants to mammalian herbivores — still an open question? In: Waller GR (ed) Tannins as Allelochemicals, role in Agriculture and Forestry, American Chemical Society, Washington DC, pp 572–587

    Google Scholar 

  • Nishida T (1976) The bark-eating habits in primates, with special reference to their status in the diet of wild chimpanzees. Folia Primat 25:277–287

    Google Scholar 

  • Ogino T, Hiraoka N, Tabata M (1978) Selection of high nicotine-producing cell lines of tobacco callus by single-cell cloning. Phytochem 17:1907–1910

    Google Scholar 

  • Parra R (1978) Comparison of foregut and hindgut fermentation in herbivores. In: Montgomery GG (ed) The Ecology of Arboreal Folivores, Smithsonian Institution Press, Washington DC, pp 205–229

    Google Scholar 

  • Richard AF (1985) Primates in Nature. WH Freeman & Company, New York

    Google Scholar 

  • Robbins CT, Mole S, Hagerman AE, Hanley TA (1987) Role of tannins in defending plants against ruminants: reduction in dry matter digestion? Ecology 68(6):1606–1615

    Google Scholar 

  • Rogers ME (1989) The feeding ecology of lowland gorillas in Gabon. Anthroquest 39:12–14

    Google Scholar 

  • Rogers ME, Williamson EA (1987) Density of herbaceous plants eaten by gorillas in Gabon: some preliminary data. Biotropica 19(3):278–281

    Google Scholar 

  • Rogers ME, Williamson EA, Tutin CEG, Fernandez M (1988) Effects of the dry season on gorilla diet in Gabon. Primate Rep 22:25–33

    Google Scholar 

  • Ryan BF, Joiner BL, Ryan TA (1985) Minitab handbook, Duxbury Press, Boston

    Google Scholar 

  • Sabater Pi J (1966) Rapport préliminaire sur l'alimentation dans la nature des gorilles de Rio Muni (Ouest Africain). Mammalia 30:235–240

    Google Scholar 

  • Sabater Pi J (1977) Contribution to the study of alimentation of lowland gorillas in the natural state, in Rio Muni, Republic of Equatorial Guinea (West Africa). Primates 18:183–204

    Google Scholar 

  • SAS (1982) SAS users' guide: statistics, SAS Institute, Cary NC, USA

    Google Scholar 

  • Schaller GB (1963) The Mountain Gorilla: Ecology and Behaviour. University of Chicago Press, Chicago

    Google Scholar 

  • Siegel S, Castellan NJ (1988) Nonparametric statistics for the behavioural sciences. McGraw-Hill, New York

    Google Scholar 

  • Sourd C, Gautier-Hion A (1986) Fruit selection by a forest guenon. J Anim Ecol 55:235–244

    Google Scholar 

  • Sussman RW (1987) Species-specific dietary patterns in primates and human dietary adaptations. In: Kinzey WG (ed) The Evolution of Human Behaviour: Primate Models, State University of New York Press, pp 151–179

  • Tutin CEG, Fernandez M (1984) Nationwide census of gorilla (Gorilla gorilla gorilla) and chimpanzee (Pan troglodytes troglodytes) populations in Gabon. Am J Primatol 6:313–336

    Google Scholar 

  • Tutin CEG, Fernandez M (1985) Foods consumed by sympatric populations of Gorilla gorilla gorilla and Pan troglodytes troglodytes in Gabon: some preliminary data. Int J Primatol 6:27–43

    Google Scholar 

  • Tutin CEG, Fernandez M (1987) Sympatric gorillas and chimpanzees in Gabon. Anthroquest 37:3–6

    Google Scholar 

  • Van Soest PJ (1982) Nutritional Ecology of the Ruminant. O and B Books, Corvallis, OR, USA

    Google Scholar 

  • Vedder AL (1984) Movement patterns of a group of free-ranging mountain gorillas (Gorilla gorilla beringei) and their relation to food availability. Am J Primatol 7:73–89

    Google Scholar 

  • Waterman PG (1984) Food acquisition and processing as a function of plant chemistry. In: Chivers DJ, Wood BA, Bilsborough A (eds) Food Aquisition and Processing in Primates. Plenum Press, New York, London, pp 177–211

    Google Scholar 

  • Waterman PG (1988) Tannins and plant-animal interactions. In: Cody V, Middleton E, Harborne JB, Beretz A (eds) Plant Flavonoids in Biology and Medicine II: Biochemical, Cellular, and Medicinal Properties. Progress in Clinical & Biological Research 280:77–91

  • Waterman PG, Choo GM, Vedder AL, Watts DP (1983) Digestibility, digestion-inhibitors and nutrients of herbacous foliage and green stems from an African montane flora and comparison with other tropical flora. Oecologia 60:244–249

    Google Scholar 

  • Watts DP (1984) Composition and variability of mountain gorilla diets in the Central Virungas. Am J Primatol 7:323–356

    Google Scholar 

  • Westoby M (1974) An analysis of diet selection by large generalist herbivores. Am Nat 108:290–304

    Google Scholar 

  • Williamson EA (1988) Behavioural Ecology of Western Lowland Gorillas in Gabon. Ph.D. thesis, University of Stirling, Scotland

  • Williamson EA, Tutin CEG, Fernandez M (1988) Western lowland gorillas feeding in streams and on savannas. Primate Rep 19:29–34

    Google Scholar 

  • Williamson EA, Tutin CEG, Rogers ME & Fernandez M (1990) Composition of the diet of lowland gorillas in Gabon. Am J Primatol (in press)

  • Wrangham RW (1987) Ecology and social relationships in two species of chimpanzee. In: Rubenstein DI, Wrangham RW (eds) Ecological Aspects of Social Evolution. Princeton University Press, Princeton, NJ, USA

    Google Scholar 

  • Wrangham RW, Waterman PG (1983) Condensed tannins in fruits eaten by chimpanzees. Biotropica 15(3):217–222

    Google Scholar 

  • Zucker WY (1983) Tannins: does structure determine function? An ecological perspective. Am Nat 121:335–365

    Google Scholar 

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Elizabeth Rogers, M., Maisels, F., Williamson, E.A. et al. Gorilla diet in the Lopé Reserve, Gabon:. Oecologia 84, 326–339 (1990). https://doi.org/10.1007/BF00329756

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