Statistical approaches in modeling of the interaction between bacteria and diatom under a dual-species co-cultivation system

This study investigates the co-cultivation system of Nitzschia palea (FACHB-2263) and Pseudomonas chlororaphis (ACCC-19853) in the artificial consortium at different concentrations. The algicidal mode is evaluated using three different full factorial experiments (FFEs) under the following three scenarios: different bacteria culture cell densities against different diatoms; algicidal activities of bacterial culture supernatant against the N. palea in different growth phases, such as lag, exponential and stationary phase; different bacteria and diatom against artificial consortium at different concentrations. For minimizing the effect of random error, three replications of each experimental run of these three FFEs are used. The influence of bacteria on growth in total chlorophyll is analyzed for all of these three replicates FFEs. The results demonstrate that: the P. chlororaphis showed high algicidal activity against N. Palea within 5 days; selected bacteria culture supernatant exhibited strong algicidal activity in the lag phase while the artificial consortium achieved the algal cell lysis at different concentrations of the bacteria to the diatom cells and the diatom to the bacteria cell; and the indoor mesocosms confirmed that P. chlororaphis effectively reduced N. palea cells by over 90% within 5 days. The findings suggest that the artificial consortia algal-bacterial symbiotic system is thus proven to be an effective and promising system for microalgae bloom control treatment algal-bacterial symbiotic system that was extrapolated for novel algae bloom control treatment.