布氏田鼠肝毛细线虫感染率与其体重的关系

2005年5月和8月,在内蒙古锡林郭勒北部典型草原调查了肝毛细线虫对布氏田鼠种群的感染特征,分析肝毛细线虫对布氏田鼠的感染率与其性别、年龄、体重及种群密度的关系。结果表明:肝毛细线虫对布氏田鼠感染率没有性别差异,雄鼠与雌鼠的感染率相当;但是与布氏田鼠体重/年龄密切相关:幼鼠的感染率较低,成鼠感染率较高,感染率和平均感染度均随着个体年龄的增长而增高。布氏田鼠达到一定的年龄(或体重)后才可感染肝毛细线虫病,其最低感染体重为24.3 g。布氏田鼠的种群密度对肝毛细线虫的感染率和平均感染度没有明显的影响,但同一样地不同季节感染率不同,本次调查显示,2005年5月份感染率高于8月份群体感染率,同一样地的春季感染率与秋季感染率之间呈现出显著的正相关。

Relationship between the infective characters of Capillaria hepatica and the body mass of the Brandt's vole ( Lasiopodomys brandtii )

The infection characters of Capillaria hepatica on the Brandt's vole(Lasiopodomys brandtii)was investigated in Xilinguole,Inner Mongolia in 2005.Current analysis showed that there was no apparent sexual discrepancy on the infection rate of C.hepatica in the Brandt's vole.The infection rate of females was the same as that of male voles.However,the infection rate is highly associated with the body mass and age of the voles.Juveniles were rarely infected by C.hepatica.Based on our data,the lowest body mass of vole infected by the C.hepatica is 24.3 grams.The infective rate is significantly positive correlated with age,the older age groups suffer higher infection rates than relatively younger groups.Moreover,the infection index is also significantly positively correlated with age.Furthermore,Body mass is another indictor which is significantly positively correlated with infection rate and infection index.Our data also showed that the density of vole population had no apparent influence on the mean infective rate of C.hepatica,neither on the infection index.The infection rate of C.hepatica on the Brandt's vole in May was higher than in August.However,the infection rates of C.hepatica on voles in different seasons are highly correlated in the same sample plot.