额尔齐斯河温氏指环虫的种群生态学研究

Population Ecology of Dactylogyrus wunderi Bychowsky in Ergis River

2009年4月至2010年1月对额尔齐斯河(中国段)东方欧鳊(Abramis brama orientalis Berg)鳃部寄生的温氏指环虫(Dactylogyrus wunderi Bychowsky)进行了取样调查,以期了解温氏指环虫的种群生态学特点。结果表明,温氏指环虫的总感染率为12.92%,平均感染强度为5.70(1～19)。感染率、感染强度在不同体长组的宿主中表现出不同的变化趋势,随着宿主体长(L)的增大,温氏指环虫的感染率在35cm以上的宿主中达到最大,为50%,而平均感染强度在20≤L<25的体长范围内最小,为1.75;温氏指环虫种群在不同体长组宿主中的分布类型主要为聚集分布,且各体长段宿主之间的感染强度差异不显著(P>0.05)。

This study has revealed the feature of population dynamics of Dactylogyrus wunderi Bychowsky by field sampling investigation on D. wunderi being found in gills of Abramis brama orientalis Berg. The results showed that D. wunderi＇s infection rate was 12.92% and the mean infection intensity was 5.70 （1 - 19）, while the prevalence was different from different host body length groups. The infection rate of D. wunderi reached the highest in the A. brama orierttalis more than 35 cm, being 50% ; while the mean infection intensity of D. wunderi was the minimum in 20 ≤ body length of A. bramct orientalis 〈 25, being 1.75. The D. wunderi exhibited the aggregation distribution in different host body lengthgroup and the infection intensity had no significant difference （ P 〉 0.05 ） among the different host body length groups.