NDLI: Microbiological and biogeochemical processes in a pockmark of the Gdansk depression, Baltic Sea

Content Provider	Springer Nature Link
Author	Pimev, N. V. Ul’yava, M. O. Kanapatskii, T. A. Sivkov, V. V. Ivav, M. V.
Copyright Year	2008
Abstract	Comprehensive microbiological and biogeochemical investigation of a pockmark within one of the sites of gas-saturated sediments in the Gdansk depression, Baltic Sea was carried out during the 87th voyage of the Professor Shtokman research vessel. Methane content in the near-bottom water and in the underlying sediments indicates stable methane flow from the sediment into the water. In the 10-m water layer above the pockmark, apart from methane anomalies, elevated numbers of microorganisms and enhanced rates of dark CO$_{2}$ fixation (up to 1.15 µmol C/(l day)) and methane oxidation (up to 2.14 nmol CH$_{4}$/(l day)) were revealed. Lightened isotopic composition of suspended organic matter also indicates high activity of the near-bottom microbial community. Compared to the background stations, methane content in pockmark sediments increased sharply from the surface to 40–60 ml/dm$^{3}$ in the 20–30 cm horizon. High rates of bacterial sulfate reduction (SR) were detected throughout the core (0–40 cm); the maximum of 74 µmol S/(dm$^{3}$ day) was located in subsurface horizons (15–20 cm). The highest rates of anaerobic methane oxidation (AMO), up to 80 µmol/dm$^{3}$ day), were detected in the same horizon. Good coincidence of the AMO and SR profiles with stoichiometry close to 1: 1 is evidence in favor of a close relation between these processes performed by a consortium of methanotrophic archaea and sulfate-reducing bacteria. Methane isotopic composition in subsurface sediments of the pockmark (from −53.0 to −56.5‰) does not rule out the presence of methane other than the biogenic methane from the deep horizons of the sedimentary cover.
Starting Page	579
Ending Page	586
Page Count	8
File Format	PDF
ISSN	00262617
Journal	Microbiology
Volume Number	77
Issue Number	5
e-ISSN	16083237
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2008-10-14
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	pockmark sulfate reduction anaerobic methane oxidation Baltic Sea Medical Microbiology Microbiology
Content Type	Text
Resource Type	Article
Subject	Microbiology Applied Microbiology and Biotechnology

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