. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . Pre s b y t i s e n t e 11 u s 500" mm RAINFALL 0 d Figure 8. Seasonal variations in the natural diets of Presbytis entellus and P. senex, in relation to the rainfall which determined food availability during the period of study. Data were collected during continuous daily observations, noted as dots along the time axis. From bottom to top, the food categories are mature leaves; young leaves and shoots; flowers; immature fruit
. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . Pre s b y t i s e n t e 11 u s 500" mm RAINFALL 0 d Figure 8. Seasonal variations in the natural diets of Presbytis entellus and P. senex, in relation to the rainfall which determined food availability during the period of study. Data were collected during continuous daily observations, noted as dots along the time axis. From bottom to top, the food categories are mature leaves; young leaves and shoots; flowers; immature fruits; mature fruits; seeds. -1 LI : t ____\ s /' ;: Q - K. Z — i Proteii — A jg-L — / 1 ^**5^_ ' Glue,do Q S_ % Hi - 0 - 1 - ..." L--'t' V =r-H U _ * _ 1— lipids ' ' Figure 9. Annual variations in the composition of the diets of Presbytis senex (solid line) and P. entellus (dashed line). frequent agonistic interactions with the neighboring groups along the territorial boundaries (Ripley, 1967) ; thus, feeding strategy and social strategy are complementary. The less mobile system of P. senex functions with more economy and without any change during the year. Both langur species eat small amounts of earth. This geophagy which has been observed among most of the primates feeding on large amounts of leaves may have no connection with the mineral nutrition (Hladik and Gueguen, 1974). The mineral content of the earth samples is smaller than the content of the food samples for both sodium and zinc, which are the only elements that might be too low in the total diet. Conclusions Primary compounds versus secondary compounds are very abundant. Conversely, for P. senex, the protein content never exceeds 12 percent but is very stable. Similar differences between the langur species appear in the rates of intake of lipids, soluble glucids, and minerals, but the highest average rate is that of P. entellus. As a result, P. entellus obtains much more energy from its environment, but i
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Keywords: ., bookcentury1900, bookcolle, booksubjectleaves, booksubjectmammals
