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Science 4 May 2001:
Vol. 292. no. 5518, pp. 917 - 920
DOI: 10.1126/science.1057627
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Reports
Production of Refractory Dissolved Organic Matter by Bacteria
Hiroshi Ogawa,1*
Yukio Amagai,1
Isao Koike,1
Karl Kaiser,2
Ronald Benner2
Most of the oceanic reservoir of dissolved organic matter (DOM) is
of marine origin and is resistant to microbial oxidation, but little is
known about the mechanisms of its formation. In a laboratory study,
natural assemblages of marine bacteria rapidly (in <48 hours) utilized
labile compounds (glucose, glutamate) and produced refractory DOM that
persisted for more than a year. Only 10 to 15% of the bacterially
derived DOM was identified as hydrolyzable amino acids and sugars, a
feature consistent with marine DOM. These results suggest that
microbial processes alter the molecular structure of DOM, making it
resistant to further degradation and thereby preserving fixed carbon in
the ocean.
1 Ocean Research Institute, The University of
Tokyo, 1-15-1 Minamidai, Nakano, Tokyo 164-8639, Japan.
2 Department of Biological Sciences and Marine
Science Program, University of South Carolina, Columbia, SC 29208, USA.
*
To whom correspondence should be addressed. E-mail:
hogawa{at}ori.u-tokyo.ac.jp
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