Picocyanobacterial Contribution to the Total Primary Production in the Northwestern Pacific Ocean

Picocyanobacteria (Prochlorococcus and Synechococcus) play an important role in primary production biogeochemical cycles the subtropical tropical Pacific Ocean, but little biological information on them is currently available North Ocean (NPO). The present study aimed to determine picocyanobacterial contributions total regions NPO using a combination of dual stable isotope method metabolic inhibitor. In terms cell abundance, Prochlorococcus were mostly dominant (95.7 ± 1.4%) region (hereafter, TP), whereas Synechococcus accounted for 50.8%–93.5% temperate SP). Regionally, averages 11.66 mg C m−2·h−1 45.2% (±4.8%) TP 22.83 70.2% SP, respectively. comparison carbon, average nitrogen uptake rates 10.11 N 90.2% (±5.3%) 4.12 63.5%, These results indicate that picocyanobacteria responsible large portion region, with higher contribution rate than carbon. A long-term monitoring variability should be implemented under global warming scenario increasing ecological roles picocyanobacteria.