. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . w^m^rt SRI LANKA Polonnaruwa imam- Cebus N^ I [Sgiga; •'•'•: **•'•: •'•» Saguinus PA N A M A Barro Colorado Figure 10. Relationship between the type of diet and the bio- masses of primates in two different field stations. The different species are located on a vertical scale, according to the biomass observed in the field. For each species, the diagram represents the proportions of different food categories ingested in one year: le
. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . w^m^rt SRI LANKA Polonnaruwa imam- Cebus N^ I [Sgiga; •'•'•: **•'•: •'•» Saguinus PA N A M A Barro Colorado Figure 10. Relationship between the type of diet and the bio- masses of primates in two different field stations. The different species are located on a vertical scale, according to the biomass observed in the field. For each species, the diagram represents the proportions of different food categories ingested in one year: leaves (left rectangle); fruits and seeds (central rectangle); insects and other prey (right rectangle). The three grades refer to the eco- logical classification of the diets presented in the discussion. essentially from the leaves (Ateles, Alouatta, Gorilla). In this category, there is a progressive trend toward forms with either a large cecum and colon (Lepile- mur, Indri), or a complex stomach {Presbytis, Colo- bus). The evolution toward a partial or total folivore has occurred in several families of primates and in several parts of the world. In the different radiations, the body weight and the digestive tract have evolved si- multaneously. The possibility of utilizing young leaves with a high protein content permitted the emergence of the large primate forms. In the rain forest, the complementarity of leaf phenological patterns of trees and lianas is the main factor on which those pri- mates are dependent (A. Hladik, 1978). The most specialized folivorous primates are adapted to the most ubiquitous resources, that is, the leaves of some common trees that may have escaped insect predation by maintaining a composition with a minimum of nu- trients. There is a limit in the maximum biomass that the folivorous primates can attain. This level is reached when the animals eat about one-tenth of the food available in their supplying area, during a yearly cycle. This c
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Keywords: ., bookcentury1900, bookcolle, booksubjectleaves, booksubjectmammals
