Community of Monogenea in Populations of from Two Tributaries of the Amazon River in the Northern Brazil.

This study compared the monogeneans community in from the Tapajós River (state of Pará) and Jari River (state of Amapá), northern Brazil. A total of 2188 monogeneans belonging to eight taxa were collected from the gills of fish: , , , , , , and . was the dominant species for from the Tapajós River basin, while predominated among the hosts from the Jari River basin. For the two populations of , the prevalence, mean intensity and mean abundance of monogeneans were different and the of parasites community had a high qualitative similarity (87.5 %). The monogeneans community of was characterized by high species richness, with infection values varying from low to moderate. The geographic distance and differences in environmental characteristics arising from the same did not influence the richness of species of monogeneans infesting in the Tapajós and Jari rivers, but appear to have been determinants in the differences observed in the structure of the monogenean communities in each region.