Fig. 9: Treatment combinations in this study.

Each row represents a nutrient level, and each column represents a submerged macrophyte assemblage. The diagram represents one of the three replicates of each treatment combination. The big circles represent the tanks; the small circles represent the pots. Each of the pots was planted with two apical shoots of the studied species. Nitrogen (N) concentration in all tanks was 2 mg L⁻¹. OP, MP, EP indicated three phosphorus (P) levels of oligotrophic P (P concentration under detection limit and no P addition), mesotrophic P (0.05 mg L⁻¹), eutrophic P (0.10 mg L⁻¹), respectively. NSP, PM, HV, P + H indicated four levels of treatment for submerged macrophyte species assemblage of no submerged plant, monoculture Potamogeton maackianus, monoculture Hydrilla verticillata, a mixture of the two plants (1:1 plant individuals), respectively.