. 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. Figure 2. Location of main study groups of siamang (TS1) and dusky leaf-monkeys (0-1) at Kuala Lompat. he lagged far behind the other siamang during their daily round of activities. Four months later he had left the group and established a territory adjacent to that of his natal group. He was joined by a young fe- male and subsequently by a fully mature female siamang. When the la
. 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. Figure 2. Location of main study groups of siamang (TS1) and dusky leaf-monkeys (0-1) at Kuala Lompat. he lagged far behind the other siamang during their daily round of activities. Four months later he had left the group and established a territory adjacent to that of his natal group. He was joined by a young fe- male and subsequently by a fully mature female siamang. When the latter animal became sexually receptive they mated and the subadult female left or was expelled from the group. By 1974 the group had disintegrated; this confirms the expectation that it is not a simple process to find a suitable partner for life. Further details of the formation of this group and a comparison of its ranging and other activities with those of the main siamang group may be found elsewhere (Aldrich-Blake and Chivers, 1973; Chivers etal., 1975). Relations between siamang groups were charac- terized by mutual avoidance and, when encounters occurred, hostile interaction between the adult males. Spacing was maintained by the distinctive booming and barking calls given in concert by all members of the group except infants. Calling sessions occurred every 3 to 4 days on the average at Kuala Lompat but were more frequent in other study areas where the siamang population density was higher (Chivers, 1974). The siamang appears to differ from the white- handed gibbon, which shows a much higher level of intergroup confrontation and display on shared terri- torial boundaries (Ellefson, 1974). Dusky leaf-monkey In contrast to the siamang, dusky leaf-monkey social groups are multimale and multifemale. With the exception of 1 small group of 5 animals, all groups whose composition was reason- ably well known by contained more than 1 adult male. Solitary males were observed
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Keywords: ., bookcentury1900, bookcolle, booksubjectleaves, booksubjectmammals
