NDLI: Microbial processes and genesis of methane gas jets in the coastal areas of the Crimean Peninsula

Content Provider	Springer Nature Link
Author	Malakhova, T. V. Kanapatskii, T. A. Egorov, V. N. Malakhova, L. V. Artemov, Yu. G. Evtushenko, D. B. Gulin, S. B. Pimev, N. V.
Copyright Year	2015
Abstract	Hydroacoustic techniques were used for detection and mapping of gas jet areas in the coastal regions of the Crimean Peninsula. Gas jet areas in the bays Laspi, Khersones, and Kazach’ya were chosen for detailed microbiological investigation. The first type of gas jets, observed in the Laspi Bay, was probably associated with discharge of deep thermogenic methane along the faults. Methane isotopic composition was characterized by δ$^{13}$C of–35.3‰. While elevated rates of aerobic methane oxidation were revealed in the sandy sediments adjacent to the methane release site, no evidence of bacterial mats was found. The second type of gas emission, observed in the Khersones Bay, was accompanied by formation of bacterial biofilms of the “Thiodendron” microbial community type, predominated by filamentous, spirochete-like organisms, in the areas of gas seepage. The isotopic composition of methane was considerably lower there (–60.4‰), indicating a considerable contribution of modern microbial methane to the gas bubbles discharged in this bay. Activity of the third type of gas emission, the jets of the Kazach’ya Bay, probably depended directly on modern microbial processes of organic matter (OM) degradation in the upper sediment layers. The rates of sulfate reduction and methanogenesis were 260 and 34 μmol dm$^{–3}$ day$^{–1}$, respectively. Our results indicate different mechanisms responsible for formation of methane jets in the Laspi Bay and in the coastal areas of the Heracles Peninsula, where the bays Kazach’ya and Khersones are located.
Starting Page	838
Ending Page	845
Page Count	8
File Format	PDF
ISSN	00262617
Journal	Microbiology
Volume Number	84
Issue Number	6
e-ISSN	16083237
Language	English
Publisher	Pleiades Publishing
Publisher Date	2015-11-25
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	sulfate reduction methane oxidation methanogenesis jet gas emissions Black Sea Microbiology Medical Microbiology
Content Type	Text
Resource Type	Article
Subject	Microbiology Applied Microbiology and Biotechnology

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