Abstract:

Objective To investigate the population and density of rodents and their dynamics in farmland in the earthquake-stricken area of Beichuan county and the new Beichuan county. Methods The night trapping method was used for the investigation into farmland rodent population dynamics in Beichuan earthquake-stricken area in July, October, 2009 and in January, April, 2010. Results In July, 2009, 44 small mammals were captured, which belonged to 2 families,4 genera and 4 species. The rodent density and sex ratio, the pregnant rate of female rodents and the average number of embryos was 20.66%, 1∶0.87, 50.00% and 3.6, respectively. In October, 2009, 28 individuals were trapped, which belonged to 2 families, 2 genera, 2 species. The population density, the sex ratio, the rate of pregnant female rodents and the average number of embryos were 16.47%, 1 ∶1, 25.00% and 3.0, respectively. In January, 2010, 8 individuals belonging to 2 families, 2 genera and 2 species were captured. The parameters were 4.00％, 1∶0.33, 0 and 0, respectively. In April, 2010, 18 individuals were caught, which belonged to 2 families, 2 genera and 2 species. The parameters were 8.37%, 1∶0.64, 71.43% and 4.0, respectively. Anourosorex squamipes was the dominant species in all the investigation. Conclusion Farmland rodent density in Beichuan county fluctuated with seasons, which may be influenced by changes in seasons and temperature, crop growth status, rodent breeding time and the impact of the massive and disastrous earthquake.

Key words: Beichuan county, Farmland, Rodent population dynamics

摘要：

目的 调查北川地震灾区的鼠类种群、密度及其动态变化，监测北川新县城的鼠类种群动态。方法 2009年7、10月和2010年1、4月，采用夹夜法在地震重灾区绵阳市北川农田进行鼠类种群动态调查。结果 2009年7月捕获鼠形动物44只，隶属2科4属4种，密度为20.66％，雌雄比为1∶0.87，雌鼠怀孕率为50.00％，平均胚胎数为3.6个; 2009年10月捕获鼠形动物28只，隶属2科2属2种，密度为16.47％，雌雄比为1∶1，雌鼠怀孕率为25.00％，平均胚胎数为3.0个; 2010年1月捕获鼠形动物8只，隶属2科2属2种，密度为4.00％，雌雄比为1∶0.33，雌鼠怀孕率为0，平均胚胎数为0个; 2010年4月捕获鼠形动物18只，隶属2科2属2种，密度为8.37％，雌雄比为1∶0.64，雌鼠怀孕率为71.43％，平均胚胎数为4.0个。4次捕获鼠形动物均以四川短尾鼩为优势种。结论 不同月份农田间鼠形动物密度随着季节变化而消长，可能受季节、气温变化，农作物生长状况，鼠类动物繁殖时间等因素影响，加之大地震对鼠类活动异常的影响。

关键词: 北川县, 农田, 鼠类种群动态