Fig. 4

Host range analyses of 15 Synechococcus host strains against 138 cyanophage isolates. Four of the genome-sequenced isolates (S-MbCM6, 7, 25, and 100) were not examined. Cyanophage standard host ranges, i.e. infection or no infection host range, exhibit little correspondence with phylogenomic lineage or environmental origin with at least one member of each lineage sharing the ability to infect CC9311, WH7803, MITS9220, UW140, and WH8101, indicating a lack of physical boundaries between cyanophage populations. There is little correspondence between host range and phylogenomic lineages, even if the structure of the host range is unlikely to occur as a result of chance (see Additional file 3: Table S8)