Fig. 3

Photobioreactor microbial community composition based on 16S rRNA gene amplicon sequencing and fluorescence microscopy. The figure shows relative abundance and taxonomic assignments of the most abundant populations (>1% relative abundance) for photobioreactors illuminated with red (a), blue (b), and white (c) light, during 77 days. Fluorescence microscopy images of biomass from the red light (d) showing the dominance of a cyanobacterium closely related to Phormidium and blue light (e) showing the dominance of a diatom closely related to Nitzschia. Eukaryotic algae sequences are based on BLAST identification of sequence reads identified as chloroplasts