Abstract: Living trapping methods were used to census population size of Indian muntjc(Muntiacus muntjak) during July 2002 in Hainan Datian National Nature Reserve which is 1 314 ha in size and is enclosed by iron whes. A total of 60 trapping sites of
3.33 ha each were randomly selected in the four habitat types according to their proportion in the Reserve. The sample size is 197. 10 ha, about 15％ of the study area. Age and sex were determined for each captured animal．A total of 109 muntjacs were trapped,whereas 4 of them escaped before their ages and sexes had been determined. Over 80% ofthe captures occurred in deciduous monsoon forest and thorn shrub,the rest were from grassland and artificial wood. A population estimation of 716.13±47.62 indicted to us that the population density was as high as 54.50±3.6／km². Among the captured animals,most of them were adult (62.50％), subadult were a little over one quarter(28.85％), juveniles were less than a tenth (9.62％). The
ratio of males to females was 1.32 to 1.00 for adult, and 1.50 to 1.00 for both sub-adults and juveniles. Information on group size and composition were presented based on 706 observatiom from October 2001 to September 2002.Solitaryanimals were located 375 times (68.31％), groups of 2 deer accounted for nearly one-third (31.15％), groups with 3 animals were observed 3 times. No groups formed by more than 3 muntjacs were recorded. No seasonal diference in group size was detected during this study (t= 1.596，P >0.05).

Key words: Indian muntjac(Muntiacus muntjak), Population density, Age structure, Sex ratio, Group size and composition

摘要：
2001年l0月至2OO2年9月在海南大田国家级自然保护区采用直接观察和在不同生境类型分层抽样进行网捕的方法研究了保护区内赤麂种群的数量、年龄结构、群体大小和组成等。结果显示，赤麂主要生活在落叶季雨林和有刺灌丛中，种群数量为716.13±47.62只，种群密度为54.5±3.6只／km2。该种群的年龄结构呈倒三角形，成体最多，占62.50％，亚成体占28.85％，幼体最少，占9.62％。成年个体的雌雄性比是1.32：1.O0，亚成体为1.50：1.O0，幼体是1.50：1.O0。群平均大小为1.32只，其中独居个体最多，占总观察次数的68.3l％；2只群次之，占31.15％；3只群最少，占0.55％；没有观察到3只以上的群。

关键词: 赤麂, 种群数量, 年龄结构, 性比, 群体大小与组成