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THE AGE ESTIMATION AND AGE STRUCTURE IN THE POPULATION OF RATTUS NIVIVENTER CONFUCIANUS

BAG Yixin, ZHUGE Yang   

  1. 1. Department of Biology, Zhejiang Normal College;
    2. Department of Biology, Hangzhou University
  • Online:2011-11-22 Published:2011-11-22

社鼠的年龄鉴定与种群年龄组成

鲍毅新, 诸葛阳   

  1. 1. 浙江师范学院生物系;
    2. 杭州大学生物系

Abstract: Based upon the lens weight of R. n. confucianus, 4 age groups were recognized.The standards of these age groups were listed below:Group 1. Juvenile: The lens weight was less than 18.0mg.Group 2. Subadult: The lens weight was 18.1-26.0mg.Group 3. Adult: The lens weight was 26.1-34.0mg.Group 4. Older: The lens weight was more than 34.1mg.The correlation coefficients of lens weight on tail length, body length and body weight were 0.8385, 0.8337 and 0.7945 respectively.In estimating the age of this rat, several characters, also cculd be used such as teeth wear,body weight, body length and tail length, but the lens weight was the most accurate.Juveniles appeared in May and July-November, and were superior in numbers in August. Subadults occupied a dominant position from October to January,and were replaced by adults between February and May. The numbers of olders increased in June and July, and decreased in autumn and winter.

摘要: 年龄组成是种群的重要特征之一。分析年龄组成中不同时期各年龄组数量的比例,有助于了解种群数量变动的规律。寿振黄等(1959)以臼齿齿根的分岐与否和前后根的长度作为红背(鼠平)的年龄标准。罗泽珣(1963)和诸葛阳等(1959、1978)分别用臼齿磨损程度和体重来划分黑线姬鼠的年龄。国外有以晶体干重为依据分析年龄组成,如Lord(1959),Adamczewska-Andrzejewska(1972),Geurley(1975),Yabe(1979)等分别对白尾兔(Cottontail rabbit)、黑线姬鼠(Apodemus agrarius)2种田鼠(Microtus pinetorumMicrotus montanus)、和褐家鼠(Rattus norvegicus)进行了不少工作。