- 著者
- Seiki TAKATSUKI Shingo MIURA Kazuo SUZUKI Kaori ITO-SAKAMOTO
- 出版者
- The Mammal Society of Japan
- 雑誌
- Journal of the Mammalogical Society of Japan (ISSN:09141855)
- 巻号頁・発行日
- vol.15, no.2, pp.91-98, 1991 (Released:2010-08-25)
- 参考文献数
- 21
- 被引用文献数
- 1
A mass mortality of sika deer (Cervus nippon) population occurred on Kinkazan Island in northern Japan in the spring of 1984, which followed an unusual cold winter. We collected a sample of 240 deer skulls. All deer were aged and sexed except some fawns. The sex ratio of >1 year old deer was 50: 50, but was skewed toward males compared with the sex ratio obtained in the population census in 1983. The oldest age at death was 12.5 years for males and 15.5 years for females. The frequency was low for young age classes. A relative cumulative frequency curve was constructed to examine the age-specific mortality pattern. The curves of both sexes suggested that mortality was relatively high for fawns and low for adult and prime-aged animals, and that mortality was higher and life span was shorter for males than for females.
- 著者
- Akihiro YAMANE Yuiti ONO Teruo DOI
- 出版者
- The Mammal Society of Japan
- 雑誌
- Journal of the Mammalogical Society of Japan (ISSN:09141855)
- 巻号頁・発行日
- vol.19, no.1, pp.9-20, 1994 (Released:2007-12-28)
- 参考文献数
- 20
- 被引用文献数
- 2
Home range size and spacing patterns of feral cats (Felis catus) were investigated and data analyzed quantitatively, to clarify the factors affecting their social organization. "Feeding groups" were identified. These consisted of male and female members which used the same garbage site mainly for feeding (Izawa et al. 1982). The spacing patterns of females showed that they defended their feeding sites from use by females of other groups. During each season mean home range size was significantly greater for males than for females. Males expanded their ranges during the females' estrous season when their mean size exceeded the predicted size based purely on metabolic requirements. Furthermore, male home range size (during the estrous season) was correlated directly with the number of females they courted. These results suggest that the mating resource, the number of receptive females, is more important in determining male home range size during the estrous season than is the food resource.
- 著者
- Tokida Kunihiko Miura Singo
- 出版者
- Mammalogical Society of Japan
- 雑誌
- Journal of the Mammalogical Society of Japan (ISSN:09141855)
- 巻号頁・発行日
- vol.13, no.2, pp.p119-126, 1988-12
- 被引用文献数
- 1
- 著者
- Kawamichi Takeo Kawamichi Mieko
- 出版者
- 一般社団法人 日本哺乳類学会
- 雑誌
- Journal of the Mammalogical Society of Japan (ISSN:09141855)
- 巻号頁・発行日
- vol.18, no.2, pp.105-109, 1993
- 被引用文献数
- 1
- 著者
- Kaneko Yukibumi
- 出版者
- 日本哺乳類学会
- 雑誌
- Journal of the Mammalogical Society of Japan (ISSN:09141855)
- 巻号頁・発行日
- vol.21, no.1, pp.1-13, 1996-06-01
- 被引用文献数
- 2 2
A study was made of age variation in the size and enamel patterns of the third upper molar of 99 <i>Eothenomys smithii</i> specimens from Japan. No significant age variation was found in either the frequency of the patterns, or the width of the dentine confluent space between the second and the third triangles. Deep lingual reentrant folds, on the posterior loop, appear in specimens where the condylobasal length (CBL) is of 22-24 mm, then the pattern with a shallow reentrant fold increases in frequency in larger CBL classes. The depth of the inner fold showed the same tendency as the changes in the patterns. A significant association, however, between five enamel patterns and age classes, depends on classification according to CBL or body weight. This proved insignificant in five CBL classes, but significant in three CBL or body weight classes. A gradual transition in the age variation of the posterior loop patterns was found among <i>Eothenomys</i> species which have rootless molars throughout life. The simple enamel pattern form significantly increased in frequency with advancing age in <i>E. andersoni</i> and <i>E. shanseius</i>, resembling <i>Clethrionomys glareolus</i> and <i>C. rufocanus</i> ; on the other hand, in <i>E. regulus</i>, <i>E. inez</i>, <i>E. eva</i>, <i>E. chinensis</i>, <i>E. wardi</i>, <i>E. custos</i> and <i>E. proditor</i> no age variation was found on the posterior loop, thus resembling <i>Microtus pennsylvanicus</i>. <i>E. smithii</i> shows a little age variation in the enamel patterns, the variation of which is of an intermediate type.
- 著者
- Endo Akira Doi Teruo
- 出版者
- 日本哺乳類学会
- 雑誌
- Journal of the Mammalogical Society of Japan (ISSN:09141855)
- 巻号頁・発行日
- vol.21, no.1, pp.27-35, 1996-06-01
- 被引用文献数
- 7 16
The home ranges and habitat preferences of female sika deer (<i>Cervus nippon</i>) on Nozaki Island, in the Goto Archipelago were studied by radio-tracking. Six radio-tagged females were tracked continuously during June, August, October and December 1991. Female deer remained in small home ranges including both open and forest habitats throughout the year. These ranges overlapped to a considerable extent, however, individuals moved independently of each other. The females tended to select open habitats from spring to autumn and forest habitats in winter.