外栉绕宫吸虫种群生态研究

外栉绕宫吸虫在不同体长组的褐菖鲉肠道内的感染率变动范围在12.50%-31.25%之间;感染强度和种群平均密度呈现不规则的变动;在体长为80mm≤L〈140mm的宿主中,外栉绕宫吸虫种群的感染率是随宿主体长的增加而逐渐增加的.不同月份中外栉绕宫吸虫在宿主肠道内的感染率、感染强度和种群平均密度没有明显的变化规律.吸虫种群在不同月份和不同体长组宿主中的分布类型属于聚集分布,而且聚集强度随种群密度增加而增强.

Population ecology of Helicometra exeta parasiting in Sebastiscus marmoratus in Taiwan Strait, China

The population ecology of Helicometra exeta Linton, 1910 parasiting in the intestines of Sebastiscus marmoratus in Taiwan Strait was reported. The results indicated that the prevalence fluctuated from 12.50% to 31.25%, but the relative intensity and the mean density of infection change irregularly in host of different body length groups. The prevalence increased with the increasing of body length of host between 80 and 140 ram. The incidence relative intensity and mean density of infection fluctuated irregularly in different month in a year. The population distribution of the fluke parasiting in the host of different group of body length and in different seasons all showed aggregated distribution. The degree of aggregation increased with the increasing of mean density of their population.