| Summary: | The parasites are most often ignored in faunal studies. Due to the great richness of Brazilian fauna, for many species we have not yet been conducted studies on the parasitic fauna, including those belonging to the family Sternidae. Six species of Sternidae are often found on the southern coast of South America. Sterna trudeaui, S. hirundinacea, Thalasseus maximus, T. acuflavidus and Sternula superciliaris South American residents and Sterna hirundo, nearctic migrant. These birds can also be considered carriers or potential reservoirs of several pathogenic bacterial genera and contaminate the environment or the surface of the water used for drinking, recreation or irrigation, playing an important role in the epidemiological chain of diseases with zoonotic potential. Thus, the study of microorganisms associated with wild sea birds is also essential to the knowledge of the natural zoonoses outbreaks. Therefore, this study aimed to carry out a survey of helminths, ectoparasites and microorganisms associated with Sternidae on the coast of southern Brazil. To this we were necropsied 106 individuals belonging to the genera Sterna, Thalasseus and Sternula, the lifting of the microbiota was performed in 52 of these through sterile swab of the trachea, lung and intestinal mucosa. Was observed a similarity of 100% between the parasitic helminth assemblies of the nearctic migrant Sterna hirundo and the South American resident S. trudeaui, and 44% of the S. hirundinacea with the others. There is no significant difference between parasite diversity of three species of Sterna birds and these data demonstrate that even when dealing with a migratory bird, which allows contact with a wider range of different environments during their migrations, Sterna hirundo does not present a greater diversity parasitic front of the resident species. Baruscapillaria rudolphii is the dominant specie in the helminth parasites assembly of Sternidae on the southern coast of Brazil. This nematode was found in all species of birds analyzed with a ...
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