中文摘要：

通过对额尔齐斯河粘鲈（ Acerina cernua）的取样调查研究，揭示了其感染复口吸虫（ Diplostomum）的种群生态学的部分特点。2009年4月至2013年4月随机选取额尔齐斯河河段内的北屯、哈巴河为采样点进行采样调查。共采集解剖体长5～13 cm粘鲈129尾。结果表明，复口吸虫的总感染率为38．76％，平均感染强度为16．06±30．85，感染0、1～5、6～10、11～15、16～20和20只以上复口吸虫的粘鲈占粘鲈总数的比率分别为61．24％、24．03％、3．88％、1．55％、1．55％和7．75％。复口吸虫感染率和感染强度随着粘鲈体长的变化而发生变化：感染率在13 cm以上的粘鲈中达到最大，为80％；平均感染强度在11 cm≤L＜13 cm范围内最大。感染强度在体长段5 cm＜L≤7 cm与9 cm＜L≤11 cm和11 cm＜L≤13 cm之间存在显著性差异。复口吸虫种群在宿主不同体长段中的分布类型均为聚集分布，且聚集强度随宿主体长的变化而发生变化。

英文摘要：

The population dynamics of Diplostomum infection in Acerina cernua in Ergis River were determined by means of field sampling and investigation .A total of 129 fish （5-13 cm） collected from Beitun and Habahe of Ergis River was studied from April 2009 to April 2013.The results showed that the prevalence of Diplostomum in Acer-ina cernua was 38.76%, and the average intensity of infection was 16.06 ±30.85.Acerina cernua, classified according to the number of Diplostomum infecting per fish（0, 1-5, 6-10, 11-15, 16-20, 〉20）, accounted for 61.24%, 24.03%, 3.88%, 1.55%, 1.55%and 7.75%of the total fish, respectively.The prevalence and in-tensity of infection varied with the length of Acerina cernua.The highest infection prevalence of Diplostomum （80%） was in size class〉13 cm and the highest mean intensity of infection occurred in size class of 11 cm〈L≤13 cm, significant difference in the infection intensity was observed among the three size classes：5 cm〈L≤7 cm, 9 cm〈L≤11 cm and 11 cm〈L≤13 cm.In conclusion , the population of Diplostomum was characterized by aggregation distribution in different host length groups and the aggregation intensity was closely related to the host size.