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長崎産ジャコウネズミ Suncus murinus temminckii Fitzingerの雄に於ける体重組成と繁殖について


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Title: 長崎産ジャコウネズミ Suncus murinus temminckii Fitzingerの雄に於ける体重組成と繁殖について
Other Titles: Seasonal Changes in the Body Weight and the Reproduction of males of Suncus murinus Temminckii Fitzinger in Nagasaki
Authors: 森田, 眞一
Authors (alternative): Morita, Shin-ichi / 森田, 真一
Issue Date: 28-Feb-1971
Publisher: 長崎大学教育学部
Citation: 長崎大学教育学部自然科学研究報告. vol.22, p.65-75; 1971
Abstract: 352 shrews, Suncus murinus temminkii, were obtained for two years, between March 1959 to February 1960 and between December 1961 to November 1962, by cage trapps settled at the entrance or in the kitchen of farmer′s or fisherman′s houses in Mogi-machi and Kawahara-machi, Nagasaki. The rate of capture is 1.¥% in average, it seems to be very high in such as insectivorous mammals. The sex-ratio is 62.896 in average. According to the results obtained in the investigation of the home range of the shrew by the mark and release method performed in the Summer of 1957, at Kawahara-machi, the rate of capture is 6A96 and the sex ratio is 6Q.096- There is no specific tendencies of the seasonal variation in the rate of capture and the -sex ratio, although the monthly variation is very prominent and they are higher in Summer than in other seasons. The body weight was investigated in 164 among 220 males and the seasonal changes of the reproductive activity was presumed. The joung males more or less 50 g in the body weight were found throughout the year as well as the old one heavier than 70 g in the body weight were caught in the every seasons of the year. The specific tendency is not recognizable in the monthly variation of the body weight, but the males heavier than 60 g in the body weight encountered more frequently in Summer and the young males lighter than 60 g were abundantly captured in Spring than in other seasons. The testes fo which weight is heavier than 120mg contain spermatozoa in the testes. The lightest testes with spermatozoa weighed 42.5 g in the body weight captured at 23 July (1962), and the heaviest one without spermatozoa weighted 54 g in the body weight entrapped at 10 March (1959). Almost all of the males which ranging 50-54.9 in the body weight contain spermatozoa in the testes. It may be assumed that the male shrew reaches its puberty when the animal attains 45-50 g in the body weight. Allmost all of the males heavier than 180 mg in the weight of the testes, the testes descend temporarily in the pseudoscrotum near the perineum. The earliest data on which an adult male with descendent testes was obtained at May 1 (1959) and the latest one was obtained at December 22 (1959). In the later case, only right testis descends in the pseudoscrotum and the case such as only right or left testis is descendent, is not rarely found in Autumn and early Winter. From these facts it assumed that the reproductive male exist throughout the year in Nagasaki and there is no sexual quiescent period in the male but the reproduction is more active in Summer than in other seasons.
URI: http://hdl.handle.net/10069/33057
ISSN: 0386443X
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:No. 22

Citable URI : http://hdl.handle.net/10069/33057

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