| Abstract | In this study, marine biofilms were cultured in a flow-lane, semi-continuous photobioreactor at different irradiances and flows to evaluate their combined effect on biofilms' phototrophic composition and photosynthetic activity. Taxon richness, evaluated by different microscopy techniques, including transmission and scanning electron microscopy, resulted to be heavily reduced from source communities to mature cultures. The strongest decrease was observed for diatoms, which were overcome by cyanobacteria and green algae over time. Photosynthetic performance was investigated by pulse amplitude modulated fluorescence. Irradiance was the main driver of data distribution of the photosynthetic parameters rel.ETR and I while flow rate affected ? and ?F/F'. The combination of irradiance and flow rate affected ?F/F' reflecting the photosynthetic performance of the most relatively abundant taxa. Higher ?F/F' was attained when cyanobacteria and green algae were dominating, whilst lower ?F/F' when diatoms occurred in the initial phase of biofilm development. |
| Text | 469179 2021 10.1016/j.marenvres.2021.105395 Scopus 2 s2.0 85109475656 photosynthesis phototrophic biofilm photobioreactors Influence of light and flow on taxon composition and photosynthesis of marine phototrophic biofilm in photobioreactors Guzzon A.; Di Pippo F.; Bonavita S.; Congestri R. Department of Biology, University of Rome Tor Vergata , Rome, Department of Biology, University of Rome Tor Vergata , Rome, Italy, , Italy; Water Research Institute, CNR IRSA, National Research Council, Area della Ricerca di Roma 1, Rome, Water Research Institute, CNR IRSA, National Research Council, Area della Ricerca di Roma 1, Rome, Italy, , , Italy; Water Research Institute, CNR IRSA, National Research Council, Area della Ricerca di Roma 1, Rome, Water Research Institute, CNR IRSA, National Research Council, Area della Ricerca di Roma 1, Rome, Italy, , , Italy In this study, marine biofilms were cultured in a flow lane, semi continuous photobioreactor at different irradiances and flows to evaluate their combined effect on biofilms phototrophic composition and photosynthetic activity. Taxon richness, evaluated by different microscopy techniques, including transmission and scanning electron microscopy, resulted to be heavily reduced from source communities to mature cultures. The strongest decrease was observed for diatoms, which were overcome by cyanobacteria and green algae over time. Photosynthetic performance was investigated by pulse amplitude modulated fluorescence. Irradiance was the main driver of data distribution of the photosynthetic parameters rel.ETR and I while flow rate affected and F/F . The combination of irradiance and flow rate affected F/F reflecting the photosynthetic performance of the most relatively abundant taxa. Higher F/F was attained when cyanobacteria and green algae were dominating, whilst lower F/F when diatoms occurred in the initial phase of biofilm development. 169 Published version http //www.scopus.com/record/display.url eid=2 s2.0 85109475656 origin=inward Articolo in rivista Applied Science Publishers, 0141 1136 Marine environmental research Marine environmental research Mar. environ. res. Marine environmental research. Journal of marine environmental research francesca.dipippo DI PIPPO FRANCESCA |
