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洞庭平原褐家鼠年龄分组及种群年龄动态分析

李世斌, 陈安国, 李波, 郭聪, 王勇, 刘辉芬   

  1. 中国科学院长沙农业现代化研究所
  • 出版日期:2006-07-29 发布日期:2007-09-13

AGE DETERMINATION AND AGE C0MPOSITION OF RATTUS NORVEGICUS POPULATION ON DONGTING PLAIN

LI Shibin, CHEN Anguo, LI Bo, WANG Yong, GUO Cong, LIU Huifen   

  • Online:2006-07-29 Published:2007-09-13

摘要: 本文采用1986年l0月-1989年12月在洞庭平原收集的褐家鼠(Rattus norvegicus)标本,以胴体重作指标, 参考繁殖特征,将褐家鼠划分5个年龄组: I.幼体组,雌鼠<60克, 雄鼠<70克;Ⅱ.亚成体组,雌鼠60—99克,雄鼠70-119克;Ⅲ.成体I组,雌鼠100~139克,雄鼠l20—169克;Ⅳ.成体Ⅱ组,雌鼠140-189克,雄鼠170一219克;Ⅴ.老体组,雌鼠>190克,雄鼠>220克。种群年龄结构的季节动态特征是:开春时以 Ⅲ、Ⅳ组占优势,初夏时I、Ⅱ组明显增加, 7、8、9月各年龄组比例较均匀,冬季以Ⅱ、Ⅲ组为主。还探讨了年龄与体重,体长、尾长及繁殖率的相互关系。

关键词: 褐家鼠, 年龄分组, 种群年龄结构

Abstract: The determination of the age groups of Rattus norvegicus were studied with data from 1O61 rats captured from the farm area of Dongting Plain,Hunan.With the body weight without viscera as a major indicator and the characteristics of reproductive organs as references,the Rattus norvegicus, were divided into 5 age groups:.Junior,female<60g,male< 70g;. Juvenile, female 60-99g,male 7O-119g; . adult I,female 100— 139g,male l20— 169g;.adut ,female 140- 189g,male 170-219g;.Old,female> 190g,male>220g.The relations between age groups and the body weight,body length,tail Iength and reproduction were studied.The characteristics of seasonal changes of the population age composition were:age group and Ⅳ were the dominant parts in the begining of spring,age group andⅡ increased obviously in the begining of summer,each age group has a certain proportion from July to September, age group and Ⅲ were superior in winter.

Key words: Rattus norvegicus, Age determination, Population age structure