Existence of obligately oligotrophic bacteria as a dominant population in the South China Sea and the West Pacific Ocean

The distribution of obligate oligotrophs in the South China Sea and the West Pacific Ocean was investigated by the ¹⁴C-MPN method with a medium containing 0.2 mg organic carbon l⁻¹. In surface waters at all stations except Singapore harbour, the total number of heterotrophic bacteria ranged from 1.3...

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Bibliographic Details
Published in:Marine ecology. Progress series (Halstenbek) 1986-01, Vol.30 (2/3), p.197-203
Main Authors: Ishida, Yuzaburo, Eguchi, Mitsuru, Kadota, Hajime
Format: Article
Language:English
Subjects:
Acetates
Amino acids
Bacteria
Heterotrophs
Marine
Oceans
Sea water
Seas
Surface water
Turbidity
Water samples
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Summary:The distribution of obligate oligotrophs in the South China Sea and the West Pacific Ocean was investigated by the ¹⁴C-MPN method with a medium containing 0.2 mg organic carbon l⁻¹. In surface waters at all stations except Singapore harbour, the total number of heterotrophic bacteria ranged from 1.3 × 10² to 2.5 × 10³ cells ml⁻¹, and 45 to 98 % of the total heterotrophs were obligate oligotrophs and the rest facultative oligotrophs. Protein hydrolysate-utilizing oligotrophs and glucose-utilizing oligotrophs were dominant, while acetate-utilizing bacteria were minor components. Bacterial numbers determined by the ¹⁴C-MPN method were more than an order of magnitude higher than those obtained by the plate count method. The heterotrophic activities (Vmax) of glutamate were remarkably high in the open ocean, while uptake of acetate was undetectable. These results emphasize the importance of obligate oligotrophs in the open ocean.
ISSN:0171-8630
1616-1599
DOI:10.3354/meps030197