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目的探讨开江县野外黑线姬鼠数量变化和繁殖情况,给其防制提供科学依据。方法1992～2007年,采用夜夹法,对野外捕获的种群进行分类、解剖,观察雌性受孕情况。结果16年布夹21107个,捕获黑线姬鼠1115只,占野外捕获总数的56.37%,其密度为5.28%,春季密度1.16%显著低于秋季的6.59%(P<0.01)。雄雌性比为0.99,春季性比1.68显著高于秋季的0.85(P<0.01)。雌性受孕率为25.76%,春季受孕率63.64%显著高于秋季的24.30%(P<0.01)。平均胎仔数为5.27只,春季平均胎仔数与秋季无统计学意义(P>0.05)。结论野外黑线姬鼠不同年度和不同季节数量变动受密度制约因素和非密度制约因素影响,其密度与性比、受孕率及平均胎仔数呈负相关关系。
Objective To explore the changes of population and reproduction of Apodemus agrarius in Kaijiang County and to provide a scientific basis for its prevention and control. Methods From 1992 to 2007, the species captured in the wild were classified and dissected by night clamp method to observe the female conception. Results The results showed that there were 21107 cloth clippings and 1115 captured Apodemus agrarius in 16 years, accounting for 56.37% of the total number captured in the field. The density was 5.28%. The density in spring was 1.16%, significantly lower than that in autumn (6.59%, P <0.01). The male-female ratio was 0.99, and the spring ratio was significantly higher than 1.68 compared with 0.85 in autumn (P <0.01). The female conception rate was 25.76%, the conception rate in spring was 63.64%, significantly higher than that in autumn (24.30%, P <0.01). The average number of litter size was 5.27. There was no significant difference between the number of average litter size in spring and autumn (P> 0.05). Conclusions The changes of the numbers of Apodemus agrarius in different years and seasons are affected by the density and non-density factors, and the density is negatively correlated with the sex ratio, pregnancy rate and average litter size.