. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . P. aygula N = 32 100 i- I 50 or LU 0_ 100 o 50 a: LEGEND Fruit Leaves and shoots Other food types M. fascicularis N = 61 M. nemestrina N= 9 Figure S. Proportions of food types of 5 species. These are pro- portions of plant parts fed upon in first contacts with feeding primates when food type was ascertained. The proportions esti- mate time spent feeding on each food type. volume. But if we assume approximately equal rates of procur
. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . P. aygula N = 32 100 i- I 50 or LU 0_ 100 o 50 a: LEGEND Fruit Leaves and shoots Other food types M. fascicularis N = 61 M. nemestrina N= 9 Figure S. Proportions of food types of 5 species. These are pro- portions of plant parts fed upon in first contacts with feeding primates when food type was ascertained. The proportions esti- mate time spent feeding on each food type. volume. But if we assume approximately equal rates of procurement, the relative time spent feeding on various foods should reflect approximately the relative amounts of those food types actually ingested. The sample sizes presented here are small, and it may be asked whether these samples are sufficient to represent the diets of the animals accurately. Fortu- nately, my assistants and I collected more than 350 hours of observation of feeding by habituated orang utans (Rodman, 1978), and in these observations we recorded the numbers of minutes spent feeding on each food-type. Comparison of the 2 estimates of dietary composition of orang utans shows that the results are nearly the same for data on first contacts and for continuous observations. Observations of food-types of the other 4 species were gathered in a manner identical to those of orang utans (observed food at first contact), and this comparison of 2 calcu- Diets, Densities, Distribution of Bornean Primates 469
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