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The study aimed to identifying free-living protozoa and characterize their frequency of occurrence in two stretches of the Pium River (P1 and P2) in Pirangi River Basin, east coast of the state of Rio Grande do Norte, verifying the water quality indicator potential of these microorganisms. It was reported the presence of 76 taxa of free-living protozoa. A multivariate regression showed that total nitrogen, total phosphorus, pH and trophic state index were significantly associated (p ≤ 0.05) to the number of species found in P2. The other point (P1) showed no significant relationship between number of species and the variables used in the study. The physical, chemical and biological parameters interfered little in the dynamics of the most frequent species, featuring mostly as generalists. It is suggested that the distribution of free-living protozoa during the study period was dependent on the availability of food and the presence of macrophytes in these environments.

ciência e natura

PROTOZOÁRIOS DE VIDA LIVRE (CILIOPHORA, MASTIGOPHORA E SARCODIA) EM DOIS TRECHOS DE UM AMBIENTE LÓTICO DO NORDESTE DO BRASIL E SEU POTENCIAL USO COMO BIOINDICADORES