山东地区大仓鼠种群年龄组成的研究

STUDY ON THE AGE COMPOSITION OF POPULATION OF CRICETULUS TRITON IN SHANDONG AREA

本文主要依据大仓鼠上颌右臼齿的生长、臼齿咀嚼面磨损程度,将其划分为幼体、亚成体、成体Ⅰ,成体Ⅱ和老体5个年龄组。通过调查和统计分析,明确了大仓鼠种群年龄组成有明显的季节变化,年度间较稳定;年龄组成的雄雌总性比为54.34:45.66,种群中性比随年龄而有差异;种群的繁殖力主要存在于成年体组,山东农业区繁殖期为3—10月份,平均胎仔数为7.60只。该研究为大仓鼠种群趋势预测和防治提供了资料。

Based on the growth of the right molartooth of mandible and theworn degree of the molartooth's chewing face,Cricetulus triton was di-vided into junivis,subadultus,adultus Ⅰ,adultus Ⅱ and senex——fiveage groups in our study.The relationship between the body weight andlength and the development of reproductive system of C.triton and itsage was also studied. From our investigations and data analyses,it was shown that theage composition of population of C.triton changed seasonally,but stab-lized annually;the sex ratio of males to females of whole age compo-sitions was 55.34:45.66 and the sex ratio of a population was differentamong different age groups;and the reproductive capacity of a popula-tion existed mainly in the adult groups and the period of reproductionin Shandong area was from March to October with an average embryonumber of 7.6.It was believed that this study would provide withuseful information for the forecasting and control of C.triton.