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Applied and Environmental Microbiology, January 2006, p. 557-564, Vol. 72, No. 1
0099-2240/06/$08.00+0     doi:10.1128/AEM.72.1.557-564.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Aerobic Anoxygenic Phototrophic Bacteria in the Mid-Atlantic Bight and the North Pacific Gyre

Matthew T. Cottrell,1* Antonio Mannino,2 and David L. Kirchman1

University of Delaware, College of Marine Studies, Lewes, Delaware 19958,1 NASA Goddard Space Flight Center, Laboratory for Hydrospheric Processes, Greenbelt, Maryland 207712

Received 11 November 2004/ Accepted 5 October 2005

The abundance of aerobic anoxygenic phototrophic (AAP) bacteria, cyanobacteria, and heterotrophs was examined in the Mid-Atlantic Bight and the central North Pacific Gyre using infrared fluorescence microscopy coupled with image analysis and flow cytometry. AAP bacteria comprised 5% to 16% of total prokaryotes in the Atlantic Ocean but only 5% or less in the Pacific Ocean. In the Atlantic, AAP bacterial abundance was as much as 2-fold higher than that of Prochlorococcus spp. and 10-fold higher than that of Synechococcus spp. In contrast, Prochlorococcus spp. outnumbered AAP bacteria 5- to 50-fold in the Pacific. In both oceans, subsurface abundance maxima occurred within the photic zone, and AAP bacteria were least abundant below the 1% light depth. The abundance of AAP bacteria rivaled some groups of strictly heterotrophic bacteria and was often higher than the abundance of known AAP bacterial genera (Erythrobacter and Roseobacter spp.). Concentrations of bacteriochlorophyll a (BChl a) were low (~1%) compared to those of chlorophyll a in the North Atlantic. Although the BChl a content of AAP bacteria per cell was typically 20- to 250-fold lower than the divinyl-chlorophyll a content of Prochlorococcus, the pigment content of AAP bacteria approached that of Prochlorococcus in shelf break water. Our results suggest that AAP bacteria can be quite abundant in some oceanic regimes and that their distribution in the water column is consistent with phototrophy.

* Corresponding author. Mailing address: University of Delaware, College of Marine Studies, 700 Pilottown Rd., Lewes, DE 19958. Phone: (302) 645-4383. Fax: (302) 645-4028. E-mail: mattcott{at}udel.edu.

Applied and Environmental Microbiology, January 2006, p. 557-564, Vol. 72, No. 1
0099-2240/06/$08.00+0     doi:10.1128/AEM.72.1.557-564.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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