Journal
FEMS MICROBIOLOGY ECOLOGY
Volume 91, Issue 5, Pages -Publisher
OXFORD UNIV PRESS
DOI: 10.1093/femsec/fiv036
Keywords
hydrostatic pressure; pressure chamber; piezophilic bacteria; deep-sea bacterial community; bacterial production; stable isotopes; membrane fatty acids
Categories
Funding
- Project BIOACID (Biological impact of Ocean Acidification) of the German Federal Ministry of Education and Research (BMBF) [FKZ 03F0608E, FKZ 03F0608F, 03F0655E, 03F0655F]
- Leibniz Society
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In this pilot study, we describe a high-pressure incubation system allowing multiple subsampling of a pressurized culture without decompression. The system was tested using one piezophilic (Photobacterium profundum), one piezotolerant (Colwellia maris) bacterial strain and a decompressed sample from the Mediterranean deep sea (3044 m) determining bacterial community composition, protein production (BPP) and cell multiplication rates (BCM) up to 27 MPa. The results showed elevation of BPP at high pressure was by a factor of 1.5 +/- 1.4 and 3.9 +/- 2.3 for P. profundum and C. maris, respectively, compared to ambient-pressure treatments and by a factor of 6.9 +/- 3.8 fold in the field samples. In P. profundum and C. maris, BCM at high pressure was elevated (3.1 +/- 1.5 and 2.9 +/- 1.7 fold, respectively) compared to the ambient-pressure treatments. After 3 days of incubation at 27 MPa, the natural bacterial deep-sea community was dominated by one phylum of the genus Exiguobacterium, indicating the rapid selection of piezotolerant bacteria. In future studies, our novel incubation system could be part of an isopiestic pressure chain, allowing more accurate measurement of bacterial activity rates which is important both for modeling and for predicting the efficiency of the oceanic carbon pump.
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