【摘要】 目的1991～1998年在内蒙古鄂尔多斯高原沙地草场,开展了三趾跳鼠繁殖生态的研究。方法利用直线夹日法调查。结果8年共捕获三趾跳鼠2 484只。其中雌性2 429只,雌性在种群中占39.81%±1.95%,雄性多于雌性。1991～1998年雌性占百分比分别为42.46%、36.09%、35.46%、42.46%、36.03%、39.92%、50%和35.64%。1991～1998年年均胎仔数分别为:3.48±0.23、3.00±0.68、2.47±0.52、2.80±0.16、3.00±0.26、3.60±0.67、2.67±0.44和3.33±0.34。结论三趾跳鼠性比、雄性睾丸下降率、雌性怀孕率和胎仔数等季节和年间均有差异。更多还原

【Abstract】 Objective To carry out the study on breeding ecology of Dipus sagitta in Ordos sandland from 1991 to 1998.Methods Rectiliner-trapping method.Results A total number of 2 484 Dipus sagitta were captured.Among this specimens there were a number of 2 429 females and took up 39.81%±1.95%.A number of females took up 42.46%,36.09%,35.46%,42.46%,36.03%,39.92%,50% and 35.46% respectively from 1991 to 1998.Average litter size were 3.48±0.23,3.00±0.68,2.47±0.52,2.80±0.16,3.00±0.26,3.60±0.67,2.67±0.44 and 3.33±0.34 respectively from 1991 to 1998.Conclusion Sex ratio,rate of testicle in scrotum,pregnant rate and litter size have obvious changes with seasons and years.更多还原