. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975. Folivores; Forest ecology; Leaves; Mammals; Mammals. Cercocebus albigena. Figure 9. Comparison of the lower P4 - Mj dentitions of Presbytis johni, a folivorous colobine and Cercocebus albigena, a frugivorous cercopithecine. Cercopithecids in general tend to have high cusps regardless of diet but folivorous'species have sharper cusps with more sharply defined shearing blades as well as larger crushing surfaces. those which plot to th
. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975. Folivores; Forest ecology; Leaves; Mammals; Mammals. Cercocebus albigena. Figure 9. Comparison of the lower P4 - Mj dentitions of Presbytis johni, a folivorous colobine and Cercocebus albigena, a frugivorous cercopithecine. Cercopithecids in general tend to have high cusps regardless of diet but folivorous'species have sharper cusps with more sharply defined shearing blades as well as larger crushing surfaces. those which plot to the right. This finding corresponds well with the visual impression of molar design of leaf- versus fruit-eating species (Figure 9). As ex- pected, species of Colobus have low values, while frugivorous cercopithecines like Miopithecus talapoin and Cercocebus albigena have very high values. Closer examination of the values on the first principal co- ordinate reveals additional dietary information. Studied in areas where they are sympatric, Clutton- Brock (1974, 1975) suggests that Colobus guereza eats more mature leaves and less fruit than does Colobus badius. The morphology of the second molars of the two species is fairly similar, but Colobus badius falls slightly to the right of Colobus guereza agreeing with Clutton-Brock's findings (the separation between these species is not large, however). One additional African colobine, Procolobus verus, falls immediately between C. guereza and C. badius, but slightly closer to C. badius. A high fiber diet with some fruit would be inferred (see Booth, 1957). Cercopithecines, which are primarily found in semi- arid savannah and woodland savannah, eat high pro- portions of grasses, rhizomes, leaves, buds, and hard beans. High grit and high fiber content foods are common in their diets. Species in this group whose diets are fairly well known are Cercopithecus aethiops, Papio ursinus, Papio anubis and Theropithecusgelada. All of these species
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