Table S1. Hydrographic parameters and chlorophyll a concentrations at two sampling stations representing subtropical estuarine (NM3) and coastal (PM7) waters of Hong Kong.

Fig. S1. A cytogram of a field sample collected from the South China Sea with abundant Prochlocococcus, mixed with a PC-rich Synechococcus cultures isolated from Hong Kong coastal waters (culture kept in f/2 medium), to demonstrate the cytometric difference between Prochlorococcus and PC-rich Synechococcus when analysed by a flow cytometer equipped with 488 nm and 635 nm dual lasers. The sample was taken from station E503 (112.28665 E; 19.1978 N) at 25 m on 11 August 2012.

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