FIG 3.

Heat map displaying the relative abundances of the top 50 most abundant OTUs across the samples. The data were transformed by square root transformation. The OTU name, lineage, and most similar strain in the NCBI database are shown on the left. OTU14 and OTU42 (red), affiliated with clade IX Synechococcus sp. RS9901, have a niche similar to that of PC-type Synechococcus. *, undescribed clade represented by Synechococcus sp. strain miyav; **, unclassified OTU (the OTU's representative sequence was less than 90% identical to the reference sequences in this study).