, Volume 11, Issue 4, pp 335–390 | Cite as

Changes in dominance rank and division of a wild Japanese monkey troop in Arashiyama

  • Naoki Koyama


This article forms the second report on the Arashiyama troop of Japanese monkeys and concerns a troop division which took place in June, 1966, and various problems of rank and consanguinity which accelerated the division. (1) The hypothesis advanced in the first report has been verified; (2) at the time of troop division, several consanguineal groups formed one unit; (3) among 16 consanguineal groups, those from 1st to 7th in rank joined the A troop, while those from 8th to 16th joined the B troop; (4) dominance relation between the two division troops was B troop>A troop, reflecting the former ranking between the leader males of the two troops; (5) shifting of monkeys from one troop to the other after division occurred frequently, but males began to make their own movements when they attained 4 or 5 years of age and rarely moved together with their mothers or other consanguineous-relatives; (6) monkeys which were continuously in the same troop after division almost always obtained higher ranks than did monkeys who frequently shifted from one troop to the other; (7) after division, some males joined neither of the two division troops but formed a group, a so-called all-male group or male party, and moved about independently.


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Copyright information

© Japan Monkey Centre 1970

Authors and Affiliations

  • Naoki Koyama
    • 1
  1. 1.Deparment of Primate Ecology, Primate Research InstituteKyoto UniversityInuyama, AichiJapan

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