Hamann M I, Kehr A I, González C E
CONICET-CECOAL, ruta 5, km 2.5, W 3400 AMD, Corrientes, Argentina.
Dis Aquat Organ. 2010 Dec 7;93(1):71-82. doi: 10.3354/dao02276.
The main goal of this study was to evaluate the relative influence of season, year of study, host body size, and host sex on abundance of helminth species parasitic in the frog Scinax nasicus. A total of 273 frogs was collected between December 2004 and November 2006 over all seasons in Corrientes City, Province of Corrientes, Argentina. Helminth community included 21 taxa, and was dominated particularly by larval trematodes. Infected frogs harboured a maximum of 7 species. Host sex and season played no significant effect in determining infracommunity parasite species abundance. Similarly, species richness was similar for both host sexes, and across time (year and season). However, occurrence of the parasites Opisthogonimus sp. 2 and Travtrema aff. stenocotyle greatly varied over time. Host body size was the main factor for determining infrapopulation structure of Centrorhynchus sp. Species richness was significantly and positively correlated with host body size. Strong associations were observed mainly between metacercariae of some species. The transmission strategies of parasites suggest that this hylid acquires infections by ingestion of infective larvae and through direct contact with larval parasites from aquatic and terrestrial habitats.
本研究的主要目的是评估季节、研究年份、宿主体型和宿主性别对寄生在纳氏琴蛙（Scinax nasicus）体内的蠕虫物种丰度的相对影响。2004年12月至2006年11月期间，在阿根廷科连特斯省科连特斯市的所有季节共采集了273只青蛙。蠕虫群落包括21个分类单元，尤其以幼虫吸虫为主。受感染的青蛙体内最多有7种寄生虫。宿主性别和季节对决定群落内寄生虫物种丰度没有显著影响。同样，宿主两性之间以及不同时间（年份和季节）的物种丰富度相似。然而，Opisthogonimus sp. 2和Travtrema aff. stenocotyle这两种寄生虫的出现随时间有很大变化。宿主体型是决定Centrorhynchus sp.种群内结构的主要因素。物种丰富度与宿主体型呈显著正相关。主要在某些物种的尾蚴之间观察到强关联。寄生虫的传播策略表明，这种雨蛙通过摄食感染性幼虫以及通过与来自水生和陆地栖息地的幼虫寄生虫直接接触而感染。
