30 – 80 %
||Price GD, Badger MR, Woodger FJ, Long BM. Advances in understanding the cyanobacterial CO2-concentrating-mechanism (CCM): functional components, Ci transporters, diversity, genetic regulation and prospects for engineering into plants. J Exp Bot. 2008 59(7):1441-61 p.1442 right column 3rd paragraphPubMed ID17578868
||Liu HB, Nolla HA, Campbell L. 1997. Prochlorococcus growth rate and contribution to primary production in the equatorial and subtropical North Pacific Ocean. Aquatic Microbiology and Ecology 12, 39–47.
||"...in oligotrophic oceans located
between 40°N and 40°S, photosynthetic CO2 fixation is
dominated by marine cyanobacteria of the Synechococcus
and Prochlorococcus genera, and together these species
have been estimated to contribute 30–80% of primary
production (primary source)."