Metagenomes of Red Sea Subpopulations Challenge the Use of Marker Genes and Morphology to Assess Diversity.

are filamentous cyanobacteria of key interest due to their ability to fix carbon and nitrogen within an oligotrophic marine environment. Their blooms consist of a dynamic assemblage of subpopulations and colony morphologies that are hypothesized to occupy unique niches. Here, we assessed the poorly studied diversity of in the Red Sea, based on metagenome-assembled genomes (MAGs) and gene-based phylotyping.