关键词: 臭鼩, 性二型, 繁殖, 年龄鉴定, 种群年龄结构

Abstract: A survey of the reproduction and population age structure of the musk shrew(Suncus murinus) was conducted in Guali farmland area of Xiaoshan County．Zhejiang Province．In the population of the musk shrew，the Sex ratio (males／females) was 1：0.72．The shrews showed a sexual dimorphism with the male being larger． The mean body weights of males and females were 54.9±1.13g and 37.9±0.70g and the mean body lengths of males and females were 122.9± 1.1Omm and 110.3±0.96mm respectively．The annual mean rate of Sex maturily of males was 86.3%. 5O% of males reached sex maturity when their tests weighed 0.1lg or their bodies 40g．All the males reached Sex maturity at 0.13g testicle weight or 50g body weight． The pregnant females were found nearly all the year round．35.7% of the females caught were pregnant and 49.6％ were sexually active．The average litter size was 3.5±0.16 ind．Among the pregnant shrews，25% were lactating.the females had two repro ductive peaks in a year，occurring in Mar．-Apr．and July- Aug．respectively．
Specimens of the musk shrews were divided into four a groupsby means of tooth 1ength index which was based upon tooth wear．The seasonal changes in the population age structure are also discussed．