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首页> 外文期刊>Journal of Parasitology >Seasonal influence on the parasite fauna of a wild population of Astronotus ocellatus (Perciformes: Cichlidae) from the Brazilian Amazon.
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Seasonal influence on the parasite fauna of a wild population of Astronotus ocellatus (Perciformes: Cichlidae) from the Brazilian Amazon.

机译：季节变化对来自巴西亚马逊河的野生天蛾（Astronotus ocellatus，寄生虫：丽鱼科）的寄生虫动物群的影响。

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摘要

Parasite infracommunities were studied in 202 specimens of Astronotus ocellatus collected from a freshwater lake in the State of Amapa, northern Brazil. Relationships between some host attributes (i.e., ontogeny, sex, and body size) and parasite infections were analyzed, but the primary focus was the seasonal variation in the parasite fauna. In total, 6,308,912 parasites belonging to 11 different taxa were found. Protozoa were the most abundant and dominant taxa, but monogeneans, trematode metacercariae, and nematode larvae were also prevalent and abundant. Fish ontogeny had a weak influence on parasite infection rates; juveniles were more parasitized by Dolops nana and Posthodiplostomum sp. The abundances of all parasite species were weakly correlated with host body size (low r2 values), except D. nana, Contracaecum sp., and Posthodiplostomum sp., which exhibited no correlation between abundance and host body size. Prevalence and abundance were different between flood and drainage seasons for all parasite species, except for D. nana and the 2 metacercarial species. Astronotus ocellatus may represent a link in food-web transmissions for parasites because it is used both as definitive and intermediate host. The parasite fauna of A. ocellatus was composed primarily of ectoparasites, and this could be considered typical of fishes that inhabit lentic waters. Seasonality was a strong determinant in the parasite community structure.
机译：在巴西北部阿马帕州的淡水湖中收集的202颗Astronotus ocellatus标本中研究了寄生虫的次生物。分析了某些寄主属性（即个体发育，性别和体型）与寄生虫感染之间的关系，但主要重点是寄生虫动物区系的季节性变化。总共发现了11308种不同种类的6308912寄生虫。原生动物是最丰富和占主导地位的分类单元，但单基因属，meta虫吸虫和线虫幼虫也很普遍和丰富。鱼的个体发育对寄生虫感染率的影响很小。幼虫更多地被Dolops nana和Posthodiplostomum sp寄生。除D. nana，Contracaecum sp。和Posthodiplostomum sp。外，所有寄生虫物种的丰度与寄主体的大小均呈弱相关（r 2 值较低），这与寄主体之间没有相关性尺寸。除寄生虫（D. nana）和2种cer螨外，所有寄生虫种类在洪水和排水季节之间的患病率和丰度都不同。由于它既被用作最终宿主，又被用作中间宿主，因此，星状球菌可能代表了食物网传播的寄生虫。 ocellatus的寄生虫动物群主要由外寄生虫组成，这可以认为是居住在胶体水域的鱼类的典型特征。季节性是决定寄生虫群落结构的重要因素。

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