Summary
Samples of stems, leaves, shoots and fruit (N=36) from lowland, African rain forest are analyzed for nutrients, digestibility and digestion-inhibiting substances. Plants from which the samples are drawn are all important in the diet of western gorillas, large generalist herbivores in coastal Cameroon. Many of the plants are common in the early succession following disturbance to the forest. Analysis of food chemistry in relation to food preference indicates that lignin, digestibility and crude protein are the most significant factors in food selection for western gorillas at this site. Food chemistry of western gorillas is compared to food chemistry of mountain gorillas in the montane forest of East Africa. Foliage consumed by western gorillas contains more condensed tannin than does foliage consumed by mountain gorillas. The greater content of condensed tannin in the leaves consumed by western gorillas is related to the greater representation of woody plants in the western diet.
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References
Altmann SA (1982) The consequences of foraging by baboons, IXth Meeting of the International Primatological Society in Atlanta, Georgia
Arnold GW, Hill JL (1972) Chemical factors affecting selection of food by ruminants. In: Harborne J (ed) Phytochemical ecology. Academic Press, London, pp 77–107
Barnell HR, Barnell E (1945) Studies in tropical fruits. XVI Ann Bot Lond 9:77–99
Bate-Smith EC (1956) The commoner phenolic constituents of plants and their systematic distribution. Sci Proc R Dublin Soc 27:165–176
Brown MB, Forsythe AB (1974) The small sample behavior of some statistics which test the equality of several means. Technometrics 16:129–132
Bullock SH (1981) Dynamics of vegetative shoots of three species of Aframomum (Zingiberaceae) in Cameroon. Adansonia ser 2, 20(4):383–392
Butzler W (1980) Présence et répartition des gorilles, Gorilla gorilla gorilla, (Savage and Wyman 1847), au Cameroun. Säugetier Mitteil, BLV Verlagsgesellschaft, München
Calvert J (1984) Gorilla food selection in relation to habitat disturbance (in prep.)
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
Cates RG, Orians GH (1975) Successional status and the palatability of plants to generalized herbivores. Ecology 56:410–418
Choo GM, Waterman PG, McKey DB, Gartlan, JS (1981) A simple enzyme assay for dry matter digestibility and its value in studying food selection by generalist herbivores. Oecologia (Berlin) 49:170–178
Gartlan JS, McKey DB, Waterman PG, Mbi CN, Struhsaker TT (1980) A comparative study of the phytochemistry of two African rain forests. Biochem syst & Ecol 8:401–422
Goering HK, Van Soest PJ (1970) Forage fiber analysis. Agriculture Handbook 379, U.S. Department of Agriculture, ARS Washington, DC
Goldstein J, Swain T (1963) Changes in tannins in ripening fruits. Phytochem 2:371–383
Gomorri G (1942) A modification of the colorimetric phosphorus determination for use with the photoelectric colorimeter. J Lab Clin Med 27:977–960
Goodall A (1977) Feeding and ranging behavior of a mountain gorilla group (Gorilla gorilla gorilla). In: Clutton-Brock TH (ed), Primate ecology: studies of feeding and ranging behavior in lemurs, monkeys and apes, Academic Press, New York, pp 449–479
Hansen E (1970) Proteins. In: Hulme AC (ed) The biochemistry of fruits and their products, Vol 1, Ser Food, Science & Technology, Academic Press, New York
Harborne JB (1977) Introduction to ecological chemistry. Academic Press, London, pp 130–151
Hladik A (1978) Phenology of leaf production in rain forest of Gabon: distribution and composition of food for folivores. In: Montgomery GG (ed) The ecology of arboreal folibores. The Smithsonian Institution Press, Washington DC, pp 51–71
Hladik CM (1975) Ecology, diet and social patterning in Old and New World Primates. In: Tuttle RH (ed) Socioecology and psychology of primates, Mouton, The Hague, pp 3–36
Hladik CM, Hladik A, Bousset T, Valdebouze P, Viroben G, Delort-Laval J (1971) Le régime alimentaire des primates de l'île de Barro Colorado (Panama), résultats des analyzes quantitatives. Folia primat 16:85–122
Horowitz W (ed) (1980) Official methods of analysis of the Association of Official Analytical Chemists. 13th ed. Association of Official Analytical Chemists, Washington DC
Hourcq V (1956) Bassins sedimentaires du Cameroun. Int'l Geol Congr (20th), Petroleum & gas symposium 1:45–68
Jones C, Sabater PJ (1971) Comparative ecology of Gorilla gorilla (Savage & Wyman) and Pan troglodytes (Blumenbach) in Rio Muni, W Africa. Bibliotech Primat 13. Karger, Basel
Letouzey R (1968) La phytogéographie du Cameroun, Leehevalier, Paris
Longhurst WH, Oh CK, Jones MB, Kepner RE (1968) A basis for the palatability of deer forage plants, 33rd N Amer Wildlife Natur Resources Conf, pp 181–192
Maynard LA, Loosli JK, Hintz HF, Warner RG (1979) Animal nutrition, 7th edition, McGraw Hill, New York
McKey DB (1979) Plant chemical defenses and the feeding and ranging behavior of Colobus monkeys in African rain forests. Ph.D. thesis, Univ of Michigan, Ann Arbor
McKey DB, Waterman P, Mbi CN, Gartlan JS, Struhsaker TT (1978) Phenolic content of vegetation in two African rain forests: ecological implications. Science 202:61–63
McKey DB, Garthan 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
Milton K (1977) The foraging strategy of the howler monkey in the tropical forest of Barro Colorado Island, Panama. Ph.D. thesis, New York University
Milton K (1979) Factors influencing leaf choice by howler monkeys, a test of some hypotheses of food selection by generalist herbivores. Am Nat 114:362–378
Nagy KA, Milton K (1979) Aspects of dietary quality, nutrient assimilation and water balance in wild howler monkeys (Alouatta palliata). Oecologia (Berlin) 39:249–258
Oates JF, Waterman PG, Choo GM (1980) Food selection by the South Indian leaf-monkey, Presbytis johnii, in relation to leaf chemistry, Oecologia (Berlin) 45:45–56
Odum EP (1969) The strategy of ecosystem development. Science 18:262–270
Pulliam HR (1975) Diet optimization with nutrient constraints. Am Nat 109:765–768
Swain T (1979) Tannins and lignins. In: Rosenthal GA, Janzen DH (eds) Herbivores: their interaction with secondary plant metabolites. Academic Press, New York, pp 657–682
Tutin C, Fernandez M (1982) Census and survey, IXth Meeting of the International Primatological Society in Atlanta, Georgia
Vedder A (1982) Movement patterns of free-ranging mountain gorilla (Gorilla gorilla berengei) and their relationship to food availability. IXth Meeting of the International Primatological Society in Atlanta, Georgia
Waterman PG, Mbi CN, McKey DB, Gartlan JS (1980) African rain forest vegetation and rumen microbes: phenolic compounds and nutrients as correlates of digestibility. Oecologia (Berlin) 47:22–33
Waterman PG (1983) Digestibility, digestion-inhibitors and nutrients of herbaceous foliage and green stems from an African montane flora and comparisons with other tropical flora. Oecologia (Berlin) 60:244–249
Westoby M (1974) An analysis of diet selection by large generalist herbivores. Am Nat 108:290–304
Whetter PA, Ullrey DE (1978) Improved fluorometric method for determining selenium. J Assoc Official Anal Chem 61:927–930
Wrangham RW, Waterman PG (1981) Feeding behavior of vervet monkeys on Acacia tortilis and Acacia xanthoploea: with special reference to reproductive strategies and tannin production. J Anim Ecol 50:715–731
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Calvert, J.J. Food selection by western gorillas (G.g. gorilla) in relation to food chemistry. Oecologia 65, 236–246 (1985). https://doi.org/10.1007/BF00379223
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DOI: https://doi.org/10.1007/BF00379223