Velho, L.F.M. Lansac-Tôha, F.M. Buosi, P.R.B. Meira, B.R. de Cabral, A.F. Lansac-Tôha, F.A. Structure of planktonic ciliates community (Protist, Ciliophora)from an urban lake of southern Brazil Subjects--Topical Terms: PROTOZOÁRIOPLÂNCTONBIOLOGIA AQUÁTICA