論文 - 松本　晶子

野生チンパンジーのメスの繁殖状態と活動時間配分の変化.

松本晶子, 小田亮

霊長類研究   15   171 - 178   1999年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Factors affecting party size in chimpanzees of the Mahale mountains

A Matsumoto-Oda, K Hosaka, MA Huffman, K Kawanaka

INTERNATIONAL JOURNAL OF PRIMATOLOGY ( KLUWER ACADEMIC/PLENUM PUBL )  19 ( 6 ) 999 - 1011   1998年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

We studied factors affecting party size and composition of wild chimpanzees at Mahale (M group) over an 11-month period Parties with 1-5 individuals were most frequent (37.8%; 153/405 parties), they included 94.7% of all male pm-ties (n = 76) and 81.3% of all female parties (n = 75). The median of monthly values was the standard for analysis. We divided the year into four period based on the median size of monthly bisexual parties (30.9 individuals; includes both males and females): monthly bisexual party sizes were larger in May-June (period II) and October-January (period IV) and smaller in February-April (period I) and July-September (period III). Only bisexual parties changed in size with period. The number of fruit items (=species) eaten was fewer in periods II and IV when abundance per item appeared to be great. The sizes of bisexual parties, which included cycling females with maximal anogenital swelling, were larger, and their representation (%) in all bisexual parties was greater in period III and IV. The numbers of both cycling females and cycling females with maximal anogenital swelling were also larger in period III and IV The percentage of cycling females with maximal anogenital swelling was greater in period II and III. The results of this study and those of Nishida (1979) suggest that seasonal variation in party size of Mahale chimpanzees maintains a relatively consistent annual cycle. The factors assumed to affect party sizes are fruit availability and the presence of cycling females with maximal anogenital swelling.

Injuries to the sexual skin of female chimpanzees at Mahale and their effect on behaviour

A Matsumoto-Oda

FOLIA PRIMATOLOGICA ( KARGER )  69 ( 6 ) 400 - 404   1998年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Changes in the activity budget of cycling female chimpanzees

A Matsumoto-Oda, R Oda

AMERICAN JOURNAL OF PRIMATOLOGY ( WILEY-LISS )  46 ( 2 ) 157 - 166   1998年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

This study is a preliminary report on the time allocated to various activities by female wild chimpanzees (Pan troglodytes schweinfurthii) during their sexual cycle. Cycling females with maximal tumescence (estrous females) tended to spend more time moving than cycling females with quiescent sexual skin (anestrous females). Although there was no statistically significant decrease in any specific activity that corresponded to the increase in time spent moving, feeding time did decrease in four of the five females. The frequency of approach by females toward males and the frequency of approach by males toward females significantly increased when females were in estrus. Direct aggression by males occurred more frequently toward estrous females than toward anestrous females. The copulation frequency and the frequency of approach to males was not significantly correlated with the increase in time spent moving. There was a high but not significant correlation between the time spent moving and the frequency of direct aggression by males toward females. Mating effort, feeding competition, male aggression, and other possible reasons that might explain the increase in moving time are discussed. (C) 1998 Wiley-Liss, Inc.

Self-suckling behaviour by a wild chimpanzee

A MatsumotoOda

FOLIA PRIMATOLOGICA ( KARGER )  68 ( 6 ) 342 - 343   1997年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

First record of a twin birth in chimpanzees of the Mahale Mountains National Park, Tanzania.

Matsumoto-Oda A

Afr Stu Monogr   16   159 - 164   1995年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

孤児の社交性.

松本晶子

霊長類研究   9   107 - 112   1993年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）