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Bacterial photosynthesis in surface waters of the open ocean


The oxidation of the global ocean by cyanobacterial oxygenic photosynthesis, about 2,100 Myr ago1, is presumed to have limited anoxygenic bacterial photosynthesis to oceanic regions that are both anoxic and illuminated2,3. The discovery of oxygen-requiring photosynthetic bacteria about 20 years ago4 changed this notion, indicating that anoxygenic bacterial photosynthesis could persist under oxidizing conditions. However, the distribution of aerobic photosynthetic bacteria in the world oceans, their photosynthetic competence and their relationship to oxygenic photoautotrophs on global scales are unknown. Here we report the first biophysical evidence demonstrating that aerobic bacterial photosynthesis is widespread in tropical surface waters of the eastern Pacific Ocean and in temperate coastal waters of the northwestern Atlantic. Our results indicate that these organisms account for 2–5% of the photosynthetic electron transport in the upper ocean.

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Figure 1: Typical fluorescence kinetic transients at 685 nm (planktonic photosynthesis) and 880 nm (bacterial photosynthesis).
Figure 2: Diel cycle in bacterial photosynthesis (filled symbols) and planktonic photosynthesis (open symbols).
Figure 3: Reaction-centre-normalized photosynthetic electron fluxes in phytoplankton (open symbols) and aerobic phototrophs (filled symbols) calculated from Equation 1 under clear sky, and photosynthetically available radiation (PAR) conditions (continuous line).
Figure 4: Spatial distribution of photosynthetic bacteria and oxygenic phytoplankton in the Pacific Ocean along 104° W in November 1999.

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This research was support by the National Science Foundation and the Office of Naval Research. We thank C. Vetriani, R. Lutz, J. Henderson, G. Ananyev and D. Klimov for technical assistance and the crew of the Alvin for their cooperation. We thank P. Minnett for the SST data.

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Correspondence to P. G. Falkowski.

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Kolber, Z., Van Dover, C., Niederman, R. et al. Bacterial photosynthesis in surface waters of the open ocean. Nature 407, 177–179 (2000).

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