1% to 30% %
||Kirchman DL, Hanson TE. Bioenergetics of photoheterotrophic bacteria in the oceans. Environ Microbiol Rep. 2013 Apr5(2):188-99. doi: 10.1111/j.1758-2229.2012.00367.x. p.188 right column top paragraphPubMed ID23584962
||Béjà, O., and Suzuki, M.T. (2008) Photoheterotrophic marine prokaryotes. In Microbial Ecology of the Oceans. Kirchman, D.L. (ed.). New York, NY, USA: John Wiley & Sons, pp. 131–157.
||"Photoheterotrophic microbes include the proteorhodopsin
(PR)-based phototrophic (PRP) bacteria
and the aerobic anoxygenic phototrophic (AAP) bacteria... Proteorhodopsin is carried by 15% to > 70% of all
bacteria in surface waters, depending on the oceanic
region and detection method (BNID 111293). AAP bacteria are also
abundant, albeit not at the levels seen for PRP bacteria,
contributing 1% to as much as 30% of all bacteria in the
surface ocean (primary source)."