Abstract: The population age structure of the musk shrew had been studied in 1he reclaimed rural area of Xiaoshan，Zhejiang from Jan.1986 to Dec．1993．The population of the musk shrew could be divded into 5 age groups with the body weight index：I．JuVenile．male≤ 30g,female≤ 24g；II.Subadult,male>30g．≤ 40g，female> 24g,≤ 36g Ⅲ．Adult Ⅰ，male＞40g，≤ 52g，female> 36g，≤ 46g；IV．Adult Ⅱ．male> 52g，≤ 64g，1emale＞46g，≤ 54g；V．Senile，male> 64g，female＞54g．The breeding characters of the musk shrew were different in different age groups．The group adultⅠ was highest group on the composition in the population.However，there were the differences on the population age structure between male and female．The main groups were the adult I．Ⅱand senile in the male population and the Suhadult and adult I in the female population.The pattern of the seasonal variation on the population age structure was difference between the male and female and the house and field population．In house，the group adultⅠof the male musk shrew was the main group in spring and winter．and the group adult I of the female was the main group in the all seasons．In field，the main group was the adultⅠ in spring,autumn and winter and the adultⅡ in summer for the male, and the Subadult in spring and winter and the adultⅠ in summer and autumn for the female．The annual variations in population age structure of the musk shrew was also discussed in this paper．

Key words: Musk shrew (Suncus murinus), Population, Age structure

摘要： 1986年1月至1993年l2月，作者在浙江萧山围垦农区采用体重法将臭鼩种群分为5个年龄组。雄体：Ⅰ幼年组(体重≤ 30g)、Ⅱ.亚成年组(体重>3Og，≤ 40g)、Ⅲ.成年Ⅰ组(体重>40g，≤ 52g)、Ⅳ ．成年Ⅱ组(体重> 52g，≤ 64g)、Ⅴ老年组(体重>64g)；雌体：幼年组(体重≤ 24g ，Ⅱ.亚成年组(体重> 24g；≤ 36g),Ⅲ.成年I组(体重> 36g，≤46g),Ⅳ.成年Ⅱ组(件重>46g，≤ 54g)，V.老年组(体重> 54g) 各年龄组的繁殖特性存在差异。种群成年Ⅰ组为主，但其种群的年龄结构存在有性别差异，雄性种群以成年Ⅰ组、成年Ⅱ组和老年组为主，雌性种群以亚成年组和成年I组为主。种群的年龄结构存在季节性变化。在室内，雄性在春季和冬季以成年Ⅱ组为主，夏季和秋季以老年组为主；在室外春季、秋季和冬季均以成年Ⅰ组为主，夏季则以成年Ⅱ组为主。室内雌性在各季节均以成年Ⅰ组为主，而在室外春季和冬季以亚成年组为主，夏季和秋季以成年Ⅰ组为主。其种群年龄结构存在有年变化。

关键词: 臭鼩, 种群, 年龄结构