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ZHANG Meiwen GUO Cong,WANG Yong,LIU Huifen,LIBo,CHEN Anguo
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张美文, 郭聪,王勇,刘辉芬,李波,陈安国
Abstract: Refer to the reproductive status, Buff-breasted rat (Rattus flavipectus) in DongtingLake region was divided into 5 age classes based on body weight without viscera: Ageclass I. juvenile, ≤35 g; II. subadu lt, 36~65 g; III. adult I, 66~100 g; IV. adu lt II,101~135 g; V. o ld, >135 g. The differences among the body weight without viscera, the body weight, the bodylength and tail length between neighboring age class were signif icant. The body weight of the animals kept increasing in all age classes. The length of body and tail also kept growing from age class I to IV , but the growing rates were notobvious in age class V. The females started breeding from age class II and reach peak at age class IV. Thesize of test is grew continuously from age class I to IV. The age distribution fluctuated from January to June, and it was stable relativelyf rom July to December.
Key words: Buff-breasted rat(Rattus flavipectus), Age determination, Dongting, lake region
摘要: 根据胴体重的频次分布和每5 g 胴体重组的鼠所对应的发育与繁殖状况, 将黄胸鼠分为5个年龄组: Ⅰ. 幼年组: 胴体重≤35 g; Ⅱ. 亚成年组: 36~ 65 g; Ⅲ. 成年一组: 66~ 100 g;Ⅳ. 成年二组: 101~ 135 g; Ⅴ. 老年组: > 135 g。经t 检验, 各组间的胴体重、体重、体长、尾长都有显著性的差异。各年龄组间的体重与胴体重存在显著的正相关, 前3个年龄组的体长和尾长与胴体重之间有极显著相关性。各年龄组的雌性比变化不大, 雌鼠的怀孕率和繁殖指数在前4个年龄组随着年龄的增大而增加, 在成年二组达到最高, 到老年组则明显降低, 参产雌鼠由幼年组的0% 逐渐增加至老年组的100%。雄鼠的睾丸随着年龄的增长而增大, 但老年组增加幅度不明显, 下位率则由0逐渐增加到100%。每年1~4月种群中以成年一组和成年二组为主, 随后, 幼年组和亚成年组的比例增加, 在7~12月各年龄组则保持着一定的平衡状态。
关键词: 黄胸鼠, 年龄, 洞庭平原
ZHANG Meiwen GUO Cong,WANG Yong,LIU Huifen,LIBo,CHEN Anguo. AGE CLASSIFICATION AND AGE STRUCTURE OF RATTUS FLAVIPECTUS IN DONGTING LAKE REGION[J]. .
张美文, 郭聪,王勇,刘辉芬,李波,陈安国. 洞庭平原黄胸鼠种群年龄组的划分[J]. .
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http://www.mammal.cn/EN/Y1998/V18/I4/268