. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . 2 3 4 5 6. 7 8 9 10 II 12 FOOD SPECIES RANKED ACCORD- ING TO TIME SPENT EATING THEM Figure 5. Overall amount of time each group spent feeding on the 12 food species eaten more commonly by each group than any other food species. (Group III) and percent (Group IV) of all tree species identified in each forest. In both areas, groups fed primarily on a few species despite the broad overall diversity of diet. Indeed, all four group
. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . 2 3 4 5 6. 7 8 9 10 II 12 FOOD SPECIES RANKED ACCORD- ING TO TIME SPENT EATING THEM Figure 5. Overall amount of time each group spent feeding on the 12 food species eaten more commonly by each group than any other food species. (Group III) and percent (Group IV) of all tree species identified in each forest. In both areas, groups fed primarily on a few species despite the broad overall diversity of diet. Indeed, all four groups spent more than 65 percent of total feeding time eating only 12 food species (Figure 5). Figure 5 also shows that this tendency to concen- trate on a few foods was more pronounced in the south than in the north. A similar pattern of a trend common to both areas, but more pronounced in the south, is apparent in results concerning seasonal variation. In both areas, the number of food species eaten by each group declined in the wet season. This difference is statisti- cally significant for all groups when only foods eaten for more than 1 percent of total feeding time are compared (Table 2, Mann-Whitney U test, p < .01). When all food species were included in the analysis, this trend was masked in the north by the long "tail" of rarely eaten foods. species composition of diet. Table 3 shows the 12 species which each group spent most time eating throughout the study, and indicates a total regional difference. This difference was largely, but not en- tirely, due to differences in the composition of the 2 forests. Only 4 species were identified which were common to both forests. Of these, Baudouinia jlug- 524 Allison Richard
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