Programa de Pós-graduação em Biodiversidade e Biotecnologia (Rede Bionorte), Universidade Federal do Amapá (UNIFAP), Macapá, AP, Brasil.
Universidade do Estado do Amapá (UEAP), Macapá, AP, Brasil.
Rev Bras Parasitol Vet. 2021 Jul 12;30(3):e006021. doi: 10.1590/S1984-29612021065. eCollection 2021.
The present study investigated the metazoan parasite community in Pimelodus ornatus from the Amazon River, in the state of Amapá (Brazil). Of 71 fish examined, 70.4% were parasitized by Demidospermus sp. (Monogenea), Cucullanus pinnai, Procamallanus (Spirocamallanus) inopinatus and Contracaecum sp. (Nematoda) and plerocercoids from Proteocephalidae gen. sp. (Cestoda). The dominance was of nematode species such as Procamallanus (S.) inopinatus and Contracaecum sp. The parasites showed a highly aggregated dispersion and a predominance of hosts infected by one species of parasite. The parasite community was characterized by a low Shannon diversity index, low evenness and low species richness. The richness of parasite species, Shannon's diversity index, abundance of P. (S.) inopinatus and Proteocephalidae gen. sp. showed a positive correlation with the length of the hosts. Therefore, the size of the hosts had an influence on the parasite community and infracommunities, as well as their intermediate position in the food web. This is the first record of P. (S.) inopinatus and Contracaecum sp. for P. ornatus.
本研究调查了来自巴西阿马帕州亚马逊河的 Pimelodus ornatus 中的后生动物寄生虫群落。在检查的 71 条鱼中，有 70.4%被 Demidospermus sp.（单殖吸虫）、Cucullanus pinnai、Procamallanus（Spirocamallanus）inopinatus 和 Contracaecum sp.（线虫）以及来自 Proteocephalidae gen. sp. 的 plerocercoids 寄生。优势是线虫物种，如 Procamallanus（S.）inopinatus 和 Contracaecum sp. 寄生虫呈现高度聚集分布，且宿主主要感染一种寄生虫。寄生虫群落的特征是 Shannon 多样性指数低、均匀度低和物种丰富度低。寄生虫物种的丰富度、Shannon 多样性指数、P.（S.）inopinatus 的丰度和 Proteocephalidae gen. sp. 与宿主的长度呈正相关。因此，宿主的大小对寄生虫群落和亚群落以及它们在食物网中的中间位置有影响。这是首次记录 P.（S.）inopinatus 和 Contracaecum sp. 寄生在 P. ornatus 上。
