Abstract # 2409 Poster # 116:

Scheduled for Friday, June 20, 2008 05:00 PM-07:00 PM: Session 12 (Ball Rooms A and B) Poster Presentation

The number of males in the mona monkey groups in the Lama Forest of the Republic of Bénin

R. Matsuda Goodwin1,2,3
1Department of Anthropology, Lehman College of the City University of New York, 250 Bedford Park Blvd. West, Bronx, NY 10468, USA, 2Principals of Informatics Research Division, National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan, 3Department of Behavioral Science, Sophie Davies School of Biomedical Education of the City University of New York, 160 Convent Avenue, New York, N.Y. 10031, USA
     Understanding the determining factors of the number of males in primate groups has been a core issue in primate socioecology. To examine this issue in wild Cercopithecus mona in the Lama Forest, I gathered data on male numbers and group size during censuses and social behavior using a frequency method during systematic walks over a 17-month period. Female numbers were difficult to grasp, but I found one-male groups (Mean=11.2, SD=4.03, n=32) were significantly smaller [t -test, t(56)=-2.53, p=0.014] than multi-male groups (Mean=15.6, SD=8.86, n=26). All-male groups varied in size between two and five (Mean= 3.4, SD=0.97, n=35). I observed friendly interactions among males within groups 121 times. Physically aggressive interactions occurred among males of different groups 71 times during 49 intergroup encounters. Male intra-sexual competition appeared to be intense. The fact that multi-male groups were significantly larger than one-male groups suggests that the number of females per group was greater in multi-male groups. In a Cameroon site, the number of females correlates with the number of males per group, although it is not clear what factors influence the number of females per group. At both forests, male mona monkeys seem to distribute themselves in accordance with the distribution of females.