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Contribution of Aerobic Photoheterotrophic Bacteria to the Carbon Cycle in the Ocean
Zbigniew S. Kolber,1*F. Gerald ,Plumley,2Andrew
S. Lang,3J. Thomas Beatty,3Robert E. Blankenship,4Cindy L. VanDover,5Costantino Vetriani,1Michal Koblizek,1Christopher Rathgeber,6Paul G. Falkowski17
The vertical distribution of bacteriochlorophyll
a, the numbers of infrared fluorescent cells, and the
variable fluorescencesignal at 880 nanometers wavelength, all indicate
that photosyntheticallycompetent anoxygenic phototrophic bacteria are
abundant in theupper open ocean and comprise at least 11% of the
total microbialcommunity. These organisms are facultative
photoheterotrophs,metabolizing organic carbon when available, but are
capable ofphotosynthetic light utilization when organic carbon is
scarce.They are globally distributed in the euphotic zone and
representa hitherto unrecognized component of the marine microbial
communitythat appears to be critical to the cycling of both organic
andinorganic carbon in the ocean.
1 Environmental Biophysics and Molecular
Ecology Program, Institute of Marine and Coastal Sciences, Rutgers
University, 71 Dudley Road, New Brunswick, NJ 08901-8521, USA.
2 Institute of Marine Science, University of Alaska,
Fairbanks, AK 99775, USA.
3 Department of
Microbiology and Immunology, University of British Columbia, University
Boulevard, Vancouver, BC, Canada V6T 1Z3.
4 Department of Chemistry and Biochemistry, Arizona
State University, Tempe, AZ 85287-1604, USA.
5 Biology Department, College of William & Mary,
Williamsburg, VA 23187, USA.
6 Department of
Microbiology, University of Manitoba, 407 Buller Building , Winnipeg,
MB, Canada R3T 2N2.
7 Department of Geology, Rutgers
University, 610 Taylor Road, Piscataway, NJ 08854-8066, USA.
*
To whom correspondence should be addressed. E-mail:
zkolber{at}imcs.rutgers.edu
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Tom Fenchel (29 June 2001) Science292 (5526), 2444.
[DOI: 10.1126/science.1062799] |Summary »|Full Text »
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