小毛足鼠繁殖生态研究

Study on Reproductive Ecology of Phodopus roborovskii Population

摘要: 1991-1995年每年4-10月的各月中旬，在内蒙古伊克昭盟达拉特旗沙地草场上，不同生态环境中共布放101845个夹日，捕获鼠6325只，其中小毛足鼠(Phodopus roborovskii)2217只，占35.05%。根据胴体重划分成4个年龄组，5年总的性比为49.61%，接近1∶ 1，无季节差异。雄性繁殖期为9个月(2-10月)，有年间差异。雌性繁殖力随着年龄的增长而增高，亚成年组、成年Ⅰ组和成年Ⅱ组的怀孕率分别为3.77%、34.27%和51.60%。雌性平均胎仔数为(6.22±1.63)只。雌性繁殖期8个月(3-10月)，一年有2个繁殖高峰。

Abstract: The study was carried out on sandy pasture in the middle ten days of each month from April to October during 1991-1995 in Dalate County,Inner Mongolia.A total efforts of 101845 trap-day was made and 6325 rodents were captured among which 2217 specimens were Phodopus roborovskii.The results obtained were as follows:1) Sex ratio (♂/♀) of Phodopus roborovskii population in this area was close to 1∶1.2) The reproductive strength of both males and females increased with ages.3) Reproductive periods of males and females were from February to October and from March to October respectively.