POPULATION-DENSITIES OF SULAWESI CRESTED BLACK MACAQUES (MACACA-NIGRA) ON BACAN AND SULAWESI, INDONESIA - EFFECTS OF HABITAT DISTURBANCE AND HUNTING

Population surveys of Sulawesi crested black macaques (Macaca nigra) w ere conducted on the Indonesian islands of Sulawesi and Bacan in 1992- 1994 to assess the status of natural populations and determine habitat and anthropogenic factors affecting their population densities. We su rveyed five sites for primates, including undisturbed and disturbed ha bitats. Data were collected on habitat structure and composition at tw o undisturbed and one disturbed forest site in which the primates were surveyed. The highest density of macaques was found in primary forest at Gunung Sibela Nature Reserve on Bacan (170.3 individuals/km(2)). P opulation density in logged forest on Bacan was high but significantly less than primary forest (133.4 individuals/km(2)). The high density of crested black macaques in primary forest on Bacan is best explained by the high carrying capacity found in primary forest. The lower food quantity and quality of food resources found in logged forest correla ted with lower primate densities compared to primary forest. However, the large population of macaques in logged forest demonstrates the con servation value of such forest. Densities on Sulawesi at Tangkoko-Batu angas-DuaSudara Nature Reserve (TBDS) showed a continuing decline sinc e earlier surveys. Primate densities were highest near the protected c enter of Tangkoko Reserve (66.7 individuals/km(2)). The peripheral are as of Batuangas and DuaSudara, even though adjacent and continuous, sh owed lower population densities of 46.4 and 23.5 individuals/km(2), re spectively. The best explanation for the continued decline of Macaca n igra populations at TBDS is hunting. Unless conservation measures are implemented immediately, M. nigra on Sulawesi risks extinction in the near future. (C) 1998 Wiley-Liss, Inc.