Pereira, D.G. Rodrigues, L.C. Lansac-Tôha, F.A. Velho, L.F.M. Planktonic heterotrophic nanoflagellate abundance along a trophic gradient in subtropical reservoirs: influence of a bottom-up or top-down control mechanism? Subjects--Topical Terms: PLANCTONPROTOZOÁRIOECOSSISTEMAÁGUA DOCEECOLOGIA AQUÁTICA