Doma I L, Ostrowski de Núñez M
Facultad de Ciencias Exactas y Naturales, Departamento de Ciencias Biológicas, Universidad de Buenos Aires, Argentina.
Rev Bras Biol. 1994 Nov;54(4):669-79.
The characteristics of the population dynamics of Posthodiplostomum nanum have been studied in two of its intermediate hosts, using prevalence, intensity and maturity of the metacercariae, considering the influence of the water temperature. In addition to this some ecological implications are described. There were made 18 samples monthly or bimonthly from may 1986 until march 1989, 1113 fishes were captured out of which 956 metacercariae were obtained. P. nanum was present along the year, having significant seasonal variation in prevalence and intensity of infestation. It was observed that the water temperature is a relevant factor in the maturation of the parasite. The values of the prevalence and intensity of infestation were higher in Jenynsia lineata than in Cnesterodon decemmaculatus. This could be explained by various factors: a) distribution of the first intermediate host; b) behavior of the second intermediate host and c) individual physiological differences of each host, specially in relation to reproduction. The relation S2/X fluctuated during the whole year, indicating the recruitment-period (autumn, spring) and the nonrecruitment-period (winter, summer) of metacercariae.
利用尾蚴的感染率、感染强度和成熟度，并考虑水温的影响，对微小后双盘吸虫在其中间宿主中的种群动态特征进行了研究。此外，还描述了一些生态学意义。从1986年5月至1989年3月，每月或每两个月采集18个样本，捕获1113条鱼，从中获得956个尾蚴。微小后双盘吸虫全年均有发现，其感染率和感染强度存在显著的季节性变化。观察到水温是寄生虫成熟的一个相关因素。线纹珍眼鱼的感染率和感染强度值高于十斑丽脂鲤。这可以通过多种因素来解释：a）第一中间宿主的分布；b）第二中间宿主的行为；c）每个宿主的个体生理差异，特别是与繁殖有关的差异。S2/X关系在全年波动，表明尾蚴的补充期（秋季、春季）和非补充期（冬季、夏季）。
