PEREIRA, D. G.; RODRIGUES, L. C.; LANSAC-TÔHA, F. A.; VELHO, L. F. M. <b&gt;Planktonic heterotrophic nanoflagellate abundance along a trophic gradient in subtropical reservoirs: influence of a bottom-up or top-down control mechanism. Acta Scientiarum. Biological Sciences, v. 36, n. 2, p. 155-163, 8 maio 2014.