黑线毛足鼠年龄和种群密度与肝毛细线虫感染率的关系

Relationships between Phodopus campbelli age and population density and Capillaria hepatica infective rate

2004—2005年,在内蒙古锡林郭勒盟阿巴嘎旗和东乌珠穆沁旗研究了肝毛细线虫病对黑线毛足鼠种群感染情况,分析肝毛细线虫对黑线毛足鼠的感染率与鼠体年龄以及种群密度的关系。结果表明,黑线毛足鼠达到一定的年龄(或体质量)才可感染肝毛细线虫病,最低感染个体体质量为14.6g。肝毛细线虫对低龄鼠的感染检出率比较低,而对成体鼠感染检出率较高,其感染率和感染度均随着个体年龄的增长而增高(感染率与年龄:r=0.97,P<0.05;感染度与年龄:r=0.93,P<0.05)。此外,黑线毛足鼠体质量与肝毛细线虫感染率和感染度也存在显著的相关关系(感染率与体质量:r=0.99,P<0.05;感染度与体质量:r=0.95,P<0.05),黑线毛足鼠的种群密度则对肝毛细线虫的感染率(r=0.27,P>0.05)和平均感染度(r=0.41,P>0.05)没有明显的影响,其感染率可能与地区不同有关。

Capillaria hepatica is one of the popular parasites to Campbell＇ s hamster （ Phodopus campbelli）. An investigation was made on the infection of C. hepatica on P. campbeUi populations in Xilinguole, Inner Mongolia from 2004 to 2005. The results showed that there was a significant positive correlation between P. campbelli age and C. hepatica infective rate （ r = 0. 97, P 〈 0. 05）. Older age groups suffered more infection than relatively younger groups, while the juveniles were rarely infected. The infection index was also significantly positively correlated with age （ r = 0. 93, P 〈 0.05）. Body mass was another indicator, which had significant positive correlations with both infective rate （ r = 0.99, P 〈 0. 05 ） and infection index （ r = 0. 95, P 〈 0. 05）. However, the population density of P. campbelli had no apparent correlation with the infective rate （r =0. 27, P〉0. 05） and infection index （r =0. 41, P 〉0. 05）.