Vertical distribution of number, biomass and size-class spectrum of bacteria in relation to oxic/anoxic conditions in the Central Baltic Sea

Total bacterial numbers and bacterial biomass were determined, and the size-class spectrum analysed, of the bacterial population in the Gotland Basin (Central Baltic Sea) during pronounced cyanobacterial blooms. Numbers of aerobic and anaerobic saprophytic bacteria and of sulphate-reducers are also...

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Bibliographic Details
Published in:Marine ecology. Progress series (Halstenbek) 1988-01, Vol.45 (1/2), p.179-186
Main Authors: Gast, Veronika, Gocke, Klaus
Format: Article
Language:English
Subjects:
Bacteria
Bacterial biomass
Basins
Marine
Nitrates
Saprophytes
Sea water
Seas
Sulfate reducing bacteria
Surface water
Thermoclines
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Summary:Total bacterial numbers and bacterial biomass were determined, and the size-class spectrum analysed, of the bacterial population in the Gotland Basin (Central Baltic Sea) during pronounced cyanobacterial blooms. Numbers of aerobic and anaerobic saprophytic bacteria and of sulphate-reducers are also reported. Below the oxic-anoxic interface a morphological change in the microfloral populations was observed. The size-class spectrum in anoxic bottom waters shifted towards larger cell forms. Average cell volume increased about 3-fold over that found in oxic waters. Anaerobic saprophytes and sulphate-reducers became more important in the H₂S-rich bottom waters. Anaerobic micro-environments in O₂-saturated water layers are discussed as important microbiotopes for anaerobic bacteria (e.g. sulphate-reducers).
ISSN:0171-8630
1616-1599
DOI:10.3354/meps045179