摘要
本文主要报道山西省汾阳和曲沃地区以及陕西省合阳和延长地区的达乌尔黄鼠(Sperm-ophilus dauricus)种群的繁殖特征。在曲沃和合阳地区,该鼠3月中旬开始交尾;在汾阳和延长地区则始于3月下旬交尾。雌体妊娠的高峰期在4月下旬至5月上旬,雄体比雌体提前10天左右进入繁殖高峰期。平均胎仔数因地区而异,合阳地区最高(5.43±0.15),次为曲沃、汾阳,延长地区最低(4.65±0.24)。
The population reproduction characteristics of daurian ground squirrel (Spermophi-lus dauricus) were studied in Fenyang, Quwo county of Shanxi Province, and Yanch-ang, Heyang county of Shaanxi Province from 1987 to 1989. The studies included mating, pregnancy, litter size, testis pt sis of the male. The results obtained are summarized as below.
1. The mating seasons of daurian ground squirrel began in the mid ten days of March in Quwo, Heyang county and in the last ten days of March in Fenyang, Yanc-hang county.
2. The pregnancy rate of females varied along with the area and years. The reproduction peaks appeared in the last ten days of April to the early ten days of May. It was also observed that the variation of pregnancy rate was relation to the yearly population density. The reproduction peaks of males appeared earlier than females about 10 days.
3. The average litter sizes was 4.72±0.12 in Fenyang, 4.59±0.09 inQuwo,4.65± 0.24 in Yanchang and 5.43 ±0.15 in Heyang.
4. The rate of embryo-absorbing of pregnancy females were 13.33% in Quwo,and 10.39% in Heyang.
出处
《兽类学报》
CAS
CSCD
北大核心
1992年第2期147-152,共6页
Acta Theriologica Sinica
基金
国家"七五"攻关项目
关键词
繁殖
达乌尔黄鼠
种群
Daurian ground squirrel (Spermophilus dauricus)
Population
Reproduction characteristics
