关键词: 东方田鼠, 繁殖, 洞庭湖区

Abstract: Field research was carried out at Matang district of Yueyang county on the east bank of Dongting lake from January，1992 to December，1994．We collected 1392 specimenst among them 599 werefemales．Thetotal sex ratio(♀／♀+ ♂)Was 43.0%．remalesbred all the year.The pregnant rate Was low from May to July and hisher than other species in this area from December to February. The total pregnantrat of the three yearswas 29.2% ．Them mean litter sizewas 5.13±0.12．The mean nest size Was4.33±0.27.The fecundity of the voles increased with the increase of age.The pregnant time of the voles bred in laboratory w as about 20 days，the mean nest size was 4.33±0.33，females matured about 50 to 60 days and ma les matured later.Voles mainly inhabit in the lake beach from November to April an d in paddy field from M ay to October．The reproductive char acteristics varied in different habitats. In lake beach,fecundity Was the highest，In paddy field，it Was moderate and in hillock，it was the lowest. So，Suitablities for voles of different habitats were different．The reproductive characteristics of four subspecies of yangtze volein China were compared in this paper.

Key words: Yangtze vole (MICROTUS fortis), Breeding, Dongting lakE arsa