Jurnal Matematika Dan Pengetahuan Alam

iv;ill.;73hal.;20c

インドネシアシブルトウノレイチョウルイカガクコツノケイタイガクテキケンキュウ

京都大学0048新制・論文博士理学博士乙第3791号論理博第643号新制||理||302(附属図書館)6036UT51-54-H91(主査)教授 江原 昭善, 教授 池田 次郎, 教授 川村 俊蔵学位規則第5条第2項該当Kyoto UniversityDA

Jurnal Matematika Dan Pengetahuan Alam

iv;ill.;148hal.;20c

Male replacement and stability of territorial boundary in a group of agile gibbons (Hylobates agilis agilis) in West Sumatra, Indonesia.

We report membership change in a group of wild agile gibbons, Hylobates agilis agilis, in West Sumatra, Indonesia. During 6-month observational periods, we focused on a particular unit of individuals known as the B group. We confirmed that the group consisted of five individuals: one adult female, one adult male, one subadult male, one subadult female, and one infant male. During our observations, the resident adult male and the two subadult individuals dispersed or disappeared, and a new adult male took over the group. We examined the effects of the male replacement on the territorial boundary, using the auditory census technique. The boundary was stable. We also documented the succession of the home range. Our results indicate a flexible social structure in this species and contribute some useful data to an ongoing debate on their social dynamics