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Food choices of the mountain gorilla in Bwindi Impenetrable National Park, Uganda: the influence of nutrients, phenolics and availability

  • Jessica Ganas (a1), Sylvia Ortmann (a2) and Martha M. Robbins (a1)
Abstract:

The factors that influence food choice have implications for animal survival, reproduction and population growth. We conducted a 1-y study of food choice by four mountain gorilla groups that consumed herbs and fruit at two locations differing spatially and temporally in food availability in Bwindi Impenetrable National Park, Uganda. We collected data on 45 important foods consumed by the gorillas, the availability of those foods in each gorilla group's home range and their corresponding nutrient and phenolic concentrations. Employing a linear multiple regression, we tested three hypotheses regarding the influence of food availability and the nutritional and phenolic concentrations of food on food choice. Regardless of changes in herb availability, the choice of herbs was positively influenced by their abundance and sugar concentrations and negatively influenced by their fibre, condensed tannin and protein concentrations. Furthermore, regardless of changes in fruit availability, the choice of fruit was positively influenced by its abundance and negatively influenced by its condensed tannin concentrations. During periods of low fruit availability, the gorillas did not increase the consumption of herbs high in fibre and sugar. The choice of herbs low in fibre had less of an influence on food choice at the location with lower fruit availability than the other location. Our results underscore the importance of incorporating both availability and nutrient concentrations into studies of food choice; by doing so we found Bwindi gorillas were able to choose abundant, relatively high-quality foods year round.

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Corresponding author
1Corresponding author. Current address: Royal Society for the Protection of Birds and the Gola Forest Programme, 133 Dama Road, Kenema, Sierra Leone. Email: jessica.ganas@rspb.org.uk
References
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AIKEN, L. S. & WEST, S. G. 1991. Multiple regression: testing and interpreting interactions. Sage, Newbury Park. 212 pp.
BOESCH, C., BERTIN GONE BI, Z., ANDERSON, D. & STAHL, D. 2006. Food choice in Taï Chimpanzees: are cultural differences present? Pp. 181199 in Hohmann, G., Robbins, M. M. & Boesch, C. (eds.). Feeding ecology of apes and other primates. Cambridge University Press, Cambridge.
CALVERT, J. J. 1985. Food selection by western gorillas (Gorilla g. gorilla) in relation to food chemistry. Oecologia 65:236246.
CHAPMAN, C. A., CHAPMAN, L. J., RODE, K. D., HAUCK, E. M. & MCDOWELL, L. R. 2003. Variation in the nutritional value of primate foods: among trees, time periods, and areas. American Journal of Primatology 24:317333.
CHESSON, J. 1983. The estimation and analysis of preference and its relationship to foraging models. Ecology 64:12971304.
COOPER, S. M. & OWEN-SMITH, N. 1985. Condensed tannins deter feeding by browsing ruminants in a south African savannah. Oecologia 67:142146.
DOMINY, N. J., LUCAS, P. W., OSORIO, D. & YAMASHITA, N. 2001. The sensory ecology of primate food perception. Evolutionary Anthropology 10:171186.
DORAN, D. M., MCNEILAGE, A., GREER, D., BOCIAN, C., MEHLMAN, P. & SHAH, N. 2002. Western lowland gorilla diet and resource availability: new evidence, cross-site comparisons, and reflections on indirect sampling methods. American Journal of Primatology 58:91116.
FIELD, A. 2005. Discovering statistics using SPSS. Sage Publications, London. 779 pp.
FREELAND, W. J. & JANZEN, D. H. 1974. Strategies in herbivory by mammals: the role of plant secondary compounds. American Naturalist 108:269289.
GANAS, J., NKURUNUNGI, J. B., ROBBINS, M. M., KAPLIN, B. A. & MCNEILAGE, A. 2004. Dietary variability of mountain gorillas in Bwindi Impenetrable National Park, Uganda. International Journal of Primatology 25:10431072.
GANAS, J., ORTMANN, S. & ROBBINS, M. M. 2008. Food preferences of wild mountain gorillas. American Journal of Primatology 70:112.
GANAS, J., NKURUNUNGI, J. B. & ROBBINS, M. M. in press. A preliminary study of the temporal and spatial biomass patterns of herbaceous vegetation consumed by mountain gorillas in an afromontane rainforest. Biotropica.
GREIG-SMITH, P. 1983. Quantitative plant ecology. University of California Press, Berkeley. 278 pp.
JANSON, C., STILES, E. W. & WHITE, D. W. 1986. Selection on plant fruiting traits by brown capuchin monkeys: a multivariate approach. Pp. 8392 in Estrada, A. & Fleming, T. H. (eds). Frugivores and seed dispersal. Dr. W. Junk, Dordrecht.
JOHNSON, D. H. 1980. The comparison of usage and availability measurements for evaluating resource preference. Ecology 61:6571.
KOOL, K. M. 1992. Food selection by the silver leaf monkey, Trachypithecus auratus sondaicus, in relation to plant chemistry. Oecologia 90:527533.
LAMBERT, J. E. 1998. Primate digestion: interactions among anatomy, physiology, and feeding ecology. Evolutionary Anthropology 7:820.
LEIGHTON, M. 1993. Modeling dietary selectivity by Bornean orangutans: evidence for integration of multiple criteria in fruit selection. International Journal of Primatology 14:257313.
MAKKAR, H. P. S., BLUEMMEL, M., BOROWY, N. K. & BECKER, K. 1993. Gravimetric determination of tannins and their correlations with chemical and protein precipitation methods. Journal of Science Food and Agriculture 61:161164.
MANLY, B. F. J. 1997. Randomization, bootstrap and Monte Carlo methods in biology. Chapman & Hall, New York. 428 pp.
MCNEILAGE, A. 1995. Mountain gorillas in the Virunga Volcanoes: ecology and carrying capacity. PhD dissertation. Bristol University.
MCNEILAGE, A., ROBBINS, M. M., GRAY, M., OLUPOT, W., BABAASA, D., BITARIHO, R., KASANGAKI, A., RAINER, H., ASUMA, S. & MUGIRI, G. 2006. Census of the mountain gorilla Gorilla beringei beringei population in Bwindi Impenetrable National Park, Uganda. Oryx 40:419427.
MILTON, K. 1981. Food choice and digestive strategies of two sympatric primate species. American Naturalist 117:476495.
NKURUNUNGI, J. B., GANAS, J., ROBBINS, M. M. & STANFORD, C. B. 2004. A comparison of two mountain gorilla habitats in Bwindi Impenetrable National Park, Uganda. African Journal of Ecology 42:289297.
PORTER, L. J., HRSTICH, L. N. & CHAN, B. G. 1986. The conversion of procyanadins and prodelphinidins to cyanidin and delphinidin. Phytochemistry 25:223230.
REMIS, M. J. 1997. Western lowland gorillas (Gorilla gorilla gorilla) as seasonal frugivores: use of variable resources. American Journal of Primatology 43:87109.
REMIS, M. J., DIERENFELD, E. S., MOWRY, C. B. & CARROLL, R. W. 2001. Nutritional aspects of western lowland gorilla (Gorilla gorilla gorilla) diet during seasons of fruit scarcity at Bai Hokou, Central African Republic. International Journal of Primatology 22:807836.
ROBBINS, M. M., NKURUNUNGI, J. B. & MCNEILAGE, A. 2006. Variability of the feeding ecology of Eastern Gorillas. Pp. 2547 in Hohmann, G., Robbins, M. M. & Boesch, C. (eds). Feeding ecology of apes and other primates. Cambridge University Press, Cambridge.
ROGERS, M. E., MAISELS, F., WILLIAMSON, E. A. & FERNANDEZ, M. 1990. Gorilla diet in the Lopé Reserve, Gabon: a nutritional analysis. Oecologia 84:326339.
ROGERS, M. E., ABERNATHY, K., BERMEJO, M., CIPOLLETTA, C., DORAN, D. M., MCFARLAND, K., NISHIHARA, T., REMIS, M. & TUTIN, C. E. G. 2004. Western gorilla diet: a synthesis from six sites. American Journal of Primatology 64:173192.
ROTHMAN, J. M., PLUMPTRE, A. J., DIERENFELD, E. S. & PELL, A. N. 2007. Nutritional composition of the diet of the gorilla (Gorilla beringei): a comparison between two montane habitats. Journal of Tropical Ecology 23:673682.
ROTHMAN, J. M., DIERENFELD, E. S., HINTZ, H. F. & PELL, A. N. 2008. Nutritional quality of gorilla diets: consequences of age, sex and season. Oecologia 155:111122.
SCHALLER, G. B. 1963. The mountain gorilla: ecology and behaviour. University of Chicago Press, Chicago. 276 pp.
SUN, C., KAPLIN, B. A., KRISTENSEN, K. A., MUNYALIGOGA, V., MVUKIYUMWAMI, J., KAJONDA, K. & MOERMOND, T. C. 1996. Tree phenology in a tropical montane forest in Rwanda. Biotropica 28:668681.
VAN SOEST, P. J., ROBERTSON, J. B. & LEWIS, B. A. 1991. Symposium: carbohydrate methodology, metabolism, and nutritional implications in dairy cattle. Journal of Dairy Science 74:35833597.
WATERMAN, P. G., CHOO, G. M., VEDDER, A. L. & WATTS, D. P. 1983. Digestibility, digestion-inhibitors, and nutrients of herbaceous foliage and green stems from an African montane flora and comparison with other tropical flora. Oecologia 60:244249.
WATTS, D. P. 1983. Foraging strategy and socioecology of Mountain gorillas (Pan gorilla beringei). PhD dissertation. University of Chicago.
WATTS, D. 1984. Composition and variability of mountain gorilla diets in the central Virungas. American Journal of Primatology 7:323356.
WESTOBY, M. 1974. An analysis of diet selection by large generalist herbivores. American Naturalist 108:290304.
WRANGHAM, R. W., CONKLIN, N. L., CHAPMAN, C. A. & HUNT, K. D. 1991. The significance of fibrous foods for Kibale forest chimpanzees. Philosophical Transactions of the Royal Society of London, series B 334:171178.
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Journal of Tropical Ecology
  • ISSN: 0266-4674
  • EISSN: 1469-7831
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