||Flombaum P et al., Present and future global distributions of the marine Cyanobacteria Prochlorococcus and Synechococcus. Proc Natl Acad Sci U S A. 2013 Jun 11 110(24):9824-9. doi: 10.1073/pnas.1307701110. P.9827 right column 3rd paragraphPubMed ID23703908
||Abstract:"Here, [investigators] present quantitative niche models for these lineages that assess present and future global abundances and distributions."
||P.9827 right column 3rd paragraph:"[Investigators] find mean annual averages of 2.9 × 10^27 and 7.0 × 10^26 cells for Prochlorococcus and Synechococcus, respectively [BNID 112100], which are in good agreement with the near surface estimate of 2.9 × 10^27 cells of total prokaryotic autotrophs (ref 22). [Their] estimates suggest that marine Cyanobacteria constitute about 10% of the total ocean marine picoplankton in the upper 200 m (assuming 3.6 × 10^28 cells) (BNID 100548)."