【摘要】 黑线毛足鼠是内蒙古草原上少见的鼠种,其数量变化与当地的优势鼠种布氏田鼠的数量成反比关系,即布氏田鼠数量高时,则黑线毛足鼠数量下降,布氏四鼠数量低时,则黑线毛足鼠数量上升。 根据该鼠臼齿的磨损程度,可划分为4个年龄组,即幼年组、亚成年组、成年组和老年组。3—8月为该鼠繁殖期,雌雄性比为1:l.08,雌鼠平均胎仔数为6.81只(2—13只),雌性成年组繁殖力最强,怀孕率占该年龄组的63.49±12.13％,雄性成年组具有精子率为97.22± 3.78％。更多还原

【Abstract】 This paper presents results of studies on the population quantity, composition and reproduction of striped hairy-footed hamster (Phodopus sungorus), it was carried out in the typical steppe in Zheng xiang bai County, Inner Mongolia from April to September 1987. A total number of 231 specimens were colleted and dissected, among which 108 were females and 123 males. Results obtained are as follows.1. There is a small number of striped hairy-footed hamster distributed in the steppe in Inner Mongolia. After rodent control, the population density of striped hairy -footed hamster increases more than brandt’s vole (Microtus brandti), while the popuola-tion density of Brandt’s vole was low.2. The specimens were divided into four age groups based on the height of gri-nding surfaces of the posterior molar and first upper molar wear of striped hairy-footed hamster. Four age groups are juvenil, subadult, adult and senior respectively.3. The sex ratio of striped hairy-footed hamster was 1:1 approximately.4. The breeding characteristic of the male was studied according to the weight and length of testis and the sex maturity. The spermatozoa were determined as landm-ark of sex maturity.5. The pregnant rate in female averaged out to 43.10±9.20%, and it was 36.40±27.67% in May, 75.00±14.20% in June, 51.90?±16.70% in July and 52.40±19.20% in August. The average litter size was 6.81±0.22, and 7.75±1.03, 7.41±0.54, 6.81±0.26 and 6.36±0.39 from May to August respectively.更多还原