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[Microbiological and biogeochemical processes in a pockmark of the Gdansk depression, Baltic Sea].
Mikrobiologiia. 2008 Sep-Oct; 77(5):651-9.M

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 CO2 fixation (up to 1.15 micromol C/(1 day)) and methane oxidation (up to 2.14 nmol CH4/(1 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/dm3 in the 20-30cm horizon. High rates of bacterial sulfate reduction (SR) were detected throughout the core (0-40 cm); the maximum of 74 micromol/(dm3 day) was located in subsurface horizons (15-20 cm). The highest rates of anaerobic methane oxidation (AMO), up to 80 micromol/(dm3 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% per hundred) does not rule out the presence of methane other than the biogenic methane from the deep horizons of the sedimentary cover.

Authors

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Pub Type(s)

English Abstract
Journal Article
Research Support, Non-U.S. Gov't

Language

rus

PubMed ID

19004347

Citation

Pimenov, N V., et al. "[Microbiological and Biogeochemical Processes in a Pockmark of the Gdansk Depression, Baltic Sea]." Mikrobiologiia, vol. 77, no. 5, 2008, pp. 651-9.
Pimenov NV, Ul'ianova MO, Kanapatski TA, et al. [Microbiological and biogeochemical processes in a pockmark of the Gdansk depression, Baltic Sea]. Mikrobiologiia. 2008;77(5):651-9.
Pimenov, N. V., Ul'ianova, M. O., Kanapatski, T. A., Sivkov, V. V., & Ivanov, M. V. (2008). [Microbiological and biogeochemical processes in a pockmark of the Gdansk depression, Baltic Sea]. Mikrobiologiia, 77(5), 651-9.
Pimenov NV, et al. [Microbiological and Biogeochemical Processes in a Pockmark of the Gdansk Depression, Baltic Sea]. Mikrobiologiia. 2008 Sep-Oct;77(5):651-9. PubMed PMID: 19004347.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - [Microbiological and biogeochemical processes in a pockmark of the Gdansk depression, Baltic Sea]. AU - Pimenov,N V, AU - Ul'ianova,M O, AU - Kanapatski,T A, AU - Sivkov,V V, AU - Ivanov,M V, PY - 2008/11/14/pubmed PY - 2008/12/23/medline PY - 2008/11/14/entrez SP - 651 EP - 9 JF - Mikrobiologiia JO - Mikrobiologiia VL - 77 IS - 5 N2 - 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 CO2 fixation (up to 1.15 micromol C/(1 day)) and methane oxidation (up to 2.14 nmol CH4/(1 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/dm3 in the 20-30cm horizon. High rates of bacterial sulfate reduction (SR) were detected throughout the core (0-40 cm); the maximum of 74 micromol/(dm3 day) was located in subsurface horizons (15-20 cm). The highest rates of anaerobic methane oxidation (AMO), up to 80 micromol/(dm3 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% per hundred) does not rule out the presence of methane other than the biogenic methane from the deep horizons of the sedimentary cover. SN - 0026-3656 UR - https://www.unboundmedicine.com/medline/citation/19004347/[Microbiological_and_biogeochemical_processes_in_a_pockmark_of_the_Gdansk_depression_Baltic_Sea]_ DB - PRIME DP - Unbound Medicine ER -