Abstract: The studies are based upon the samples collected from the farmland month by month from November 1983 to December 1984. Taking height of the grinding surface of the posterior molar(M³) and the molar wear as the age criteria(Fig. 2), the samples were divided into five age groups. The paper shows that body weight and body length are not suitable age indicators for the striped hamster (Cricetulus barabensis).The studies also deal with the reproduction status of each age group which with the age structure could be the base of predicating population dynamics.The population flunctuations of the striped hamster in Yanggu County region during 1984 are explained both by the population age composition and the abiotic factors, especially monthly precipitation. The population density curve has two peaks that coincide with the dryer season of the year(Fig. 3).

Key words: Striped hamster, Cricetulus barabensis, Age determination, Population age structure, Population dynamics

摘要： 本文对黑线仓鼠的上臼齿磨损程度进行了系统观察,共采标本553只,结合生殖系统的解剖记录,确定以右侧上臼齿的磨损程度将黑线仓鼠划分为5个年龄组。探讨了年龄与体长、体重及繁殖力的相互关系,以及种群数量季节消长与气候条件及种群结构的关系。结果表明,黑线仓鼠年龄越大,雌鼠的繁殖力越高,但平均怀仔量并不随年龄增大而增加。体重、体长不易作为划分黑线仓鼠年龄组的指标。种群数量与大降雨量呈明显的负相关,但种群的年龄结构对数量消长起着主要作用。

关键词: 黑线仓鼠, 年龄鉴定, 种群年龄组成, 种群数量消长