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目的对山西省娄烦县生态区2011年北社鼠种群年龄结构及季节变动进行研究。方法逐月捕鼠,将捕获的北社鼠鉴别雌雄并制作头骨标本,依据左侧第3上臼齿(M3)的生长与磨损程度鉴定北社鼠年龄后划分出该鼠各月的种群年龄组成。结果幼年鼠与亚成年鼠数量全年之和所占比例接近总种群的一半;成年鼠所占比例也较高,为43.13%;老年鼠所占比例最低,仅为7.81%;不同月份北社鼠种群年龄结构差异有统计学意义;成年组和老年组中雌性所占比例少于幼年组和亚成年组。结论北社鼠种群年龄结构月际更替关系明显,6-11月均有幼年鼠存在,繁殖期较长,成年雌性个体的生殖行为可能使其个体死亡率高于雄性,造成成年组和老年组中雌性比例下降。
Objective To study the age structure and seasonal variation of the North Society rats population in Loufan County, Shanxi Province in 2011. Methods The mice were captured on a monthly basis, and the male and female captured were divided into male and female to make skull specimens. According to the growth and abrasion of the third molar on the left, . Results The number of juvenile rats and that of adult mice was nearly half of that of the whole population. The proportion of adult rats was also high, 43.13%, while the percentage of aged rats was the lowest (7.81%). In different months, The age structure of the rats was statistically different. The proportion of females in the adult group and the elderly group was less than that in the young group and the sub-adult group. Conclusion The relationship between the age structure of Belesong mice population is obviously changed from month to month. The juvenile rats exist in June to November and the reproductive period is longer. The reproductive behavior of adult females may cause their individual mortality rate to be higher than that of males, The proportion of females decreased.