Penyebaran Dan Kelimpahan Populasi Monyet Ekor Panjang (Macaca Fascicularis) Di Cagar Alam Sibolangit

Long-tailed macaque (Macaca fascicularis) can be found in Sibolangit Nature Reserves North Sumatera. This research was conducted to determine its group distribution and abundance of the population using concentration count and its habitat was observed by rapid assessment in 7 location. 2 group of long-tailed macaque was found, first group found in the southern part of a nature reserve with a group size of 18-25 individuals. Second group was found in the northern part of nature reserve with a group size of 15-20 individuals. The group distribution was affected by the location of sources of water, food resources, human and other animals. Food plant species consist of rambung merah (Ficus sumatrana), terap (Artocarpus elasticus), kayu ageng (Antidesma montanum), nanglit (Nauclea cyrtopoda), lateng gajah (Laporta sinuata), beringin (Ficus benjamina), jelatang (Toxicodendron radicans), aren (Arenga pinnata), riman (Caryota sp), senduduk (Melastoma affine). Key word: sibolangit nature reserve, long-tailed macaque, distribution of population and abundanc