Abstract
For the sake of population management in captivity three adult Japanese macaques (Macaca fuscata) were isolated from the originated group in Ueno Zoological Gardens, Tokyo, Japan, during a breeding season in 2014. I investigated social rank and social interactions of these males comparing with other group members among three phases (before, during, and after isolation). The most dominant male dropped his rank after isolation and changed his interaction partners. After the reintroduction of three males, most of individuals that remained in the group attacked to isolated males. The result suggest that temporal isolation caused drastic change in social interaction and that this manipulation might increase a risk of fight with injury in the group. Therefore we should consider number and combination of individuals isolate together at once, depend on situation of social structure inside the enclosure.
