FIG 2.

The dynamic relationships between Synechococcus and heterotrophic bacteria (A) and POC and DOC (B) in Synechococcus sp. XM-24 culture over a 72-day growth period. The abundances of Synechococcus and heterotrophic bacteria were measured by flow cytometry. The original abundances of Synechococcus and heterotrophic bacteria were 1.76 × 10⁷ and 2.52 × 10⁷ cells · ml⁻¹, respectively. A similar dynamic pattern with different initial inocula of Synechococcus sp. XM-24 liquid cultures was observed (Fig. S2 in the supplemental material).