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Surface distributions of Synechococcus (A,C,E,G) and picoeukaryotes (B,D,F,H) in the Bohai Sea in March, June, September, and December, respectively. Unit: cells mL-1. Black dotes represents the stations where samples were collected. Syn, Synechococcus; Euk, picoeukaryotes; Mar, March; Jun, June; Sep, September; Dec, December.
