Redundancy analysis (RDA) showing the relationships between ciliate species (red arrows) and environmental parameters (blue arrows) among control (C) and restored (N) sites for the one-month immersion period. Abbrevations: N = nitrites; COD = chemical oxygen demand; OM = organic matter; IM = inorganic matter; CHL = chlorophyll a concentration; AC = Aspidisca cicada; CU = Chilodonella uncinata; CM = Cinetochilum margaritaceum; CYC = Cyclidium sp.; HO = Holophrya ovum; PV = Platyophrya vorax; PG = Pleurotricha grandis; PA = Pseudochilodonopsis algivora; TC = Trithigmostoma cucullulus; VAC = Vorticella aquadulcis-complex.