Microbial Community Composition and Rates of the Methane Cycle Microbial Processes in the Upper Sediments of the Yamal Sector of the Southwestern Kara Sea

Savvichev, Alexander S; Rusanov, Igor I; Kadnikov, V. V.; Beletskii, A. V.; Ravin, Nikolai V.; Pimenov, Nikolay

doi:10.1134/s0026261718020121

Cited by 11 publications

(6 citation statements)

References 46 publications

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“…Relatively low but considerable (ca. 1%) abundance of Sulfurovaceae was previously reported for the sediments of the Yamal Sector of the Kara Sea 68 . Members of this family are chemolithoautotrophs coupling sulfur oxidation with nitrate reduction or oxygen respiration, which makes them crucial primary biomass producers in the community at both oxic and anoxic conditions.…”

Section: Discussionsupporting

confidence: 67%

“…4 ). High relative abundance of the orders Desulfobacterales, Desulfovibrionales, Desulfuromonadales , which include a lot of sulfate reducing bacteria, was reported for the sediments of the Yamal Sector of the Kara Sea 68 . Also, Desulfobulbaceae, Desulfuromonadaceae , and Pelobacteraceae were found to be enriched in the sediments of the North Sea and Baltic Sea near the Fe(III)/Fe(II) redox boundary, while higher abundance of Desulfococcus and Desulfobacterium was detected at greater depths of these sediments with decreased Fe-reducing activity 69 .…”

Section: Discussionmentioning

confidence: 92%

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Fast-growing Arctic Fe–Mn deposits from the Kara Sea as the refuges for cosmopolitan marine microorganisms

Shulga

Abramov

Klyukina

et al. 2022

Sci Rep

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The impact of biomineralization and redox processes on the formation and growth of ferromanganese deposits in the World Ocean remains understudied. This problem is particularly relevant for the Arctic marine environment where sharp seasonal variations of temperature, redox conditions, and organic matter inflow significantly impact the biogenic and abiotic pathways of ferromanganese deposits formation. The microbial communities of the fast-growing Arctic Fe–Mn deposits have not been reported so far. Here, we describe the microbial diversity, structure and chemical composition of nodules, crust and their underlying sediments collected from three different sites of the Kara Sea. Scanning electron microscopy revealed a high abundance of microfossils and biofilm-like structures within the nodules. Phylogenetic profiling together with redundancy and correlation analyses revealed a positive selection for putative metal-reducers (Thermodesulfobacteriota), iron oxidizers (Hyphomicrobiaceae and Scalinduaceae), and Fe-scavenging Nitrosopumilaceae or Magnetospiraceae in the microenvironments of the Fe–Mn deposits from their surrounding benthic microbial populations. We hypothesize that in the Kara Sea, the nodules provide unique redox-stable microniches for cosmopolitan benthic marine metal-cycling microorganisms in an unsteady environment, thus focusing the overall geochemical activity of nodule-associated microbial communities and accelerating processes of ferromanganese deposits formation to uniquely high rates.

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Section: Discussionsupporting

confidence: 67%

Section: Discussionmentioning

confidence: 92%

Fast-growing Arctic Fe–Mn deposits from the Kara Sea as the refuges for cosmopolitan marine microorganisms

Shulga

Abramov

Klyukina

et al. 2022

Sci Rep

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“…The highest CH 4 concentration was found in the sediments inhabited by symbiotrophic siboglinidae and thyasirid bivalves (Savvichev et al, 2018a;Vedenin et al, 2020). These values were greater than the range of typical concentrations for oxidative (0.01-2.00 µM) and reducing (2.5-13.0 µM, less often up to 20 µM) sediments of the Laptev Sea (Savvichev et al, 2010(Savvichev et al, , 2018bLein et al, 2013). The mats of methanotrophic bacteria were characterized, and active microbial methane oxidation was determined in the upper sediment layer within the cold seep area.…”

Section: Discussionmentioning

confidence: 84%

Methane-Derived Authigenic Carbonates on the Seafloor of the Laptev Sea Shelf

et al. 2021

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Seafloor authigenic carbonate crusts are widespread in various oceanic and marine settings, excluding high-latitude basins that are corrosive to carbonate precipitation. Newly formed carbonate formations are relatively rare in modern Arctic marine sediments. Although the first-order principles of seep carbonate formation are currently quite well constrained, little is known regarding the duration or mode of carbonate formation in the Siberian Arctic shelf. Large (massive slabs or blocks) and small crusts that were micrite cemented have been recently discovered on the seafloor of the Siberian Arctic seas within the area of known seep activity in the outer Laptev Sea shelf. Cold methane seeps were detected in the area due to the presence of an acoustic anomaly in the water column (gas flares). Microbial mats, methane gas bubbles, and carbonate crusts were observed using a towed camera platform. Here, we report new geochemical and mineralogical data on authigenic shallow Siberian Arctic cold-seep carbonate crusts to elucidate its genesis. The Laptev Sea carbonate crusts mainly consist of high-Mg calcite (up to 23 mol % MgCO3). The δ13C values in carbonates range significantly (from –40.1 to –25.9‰ VPDB), while the δ18O values vary in a narrow range (+4.4 ± 0.2‰ VPDB). The δ13C values of Corg that was determined from carbonates range from –40.2 to –31.1‰ VPDB. Using the isotope data and taking into account the geological setting, we consider that not only microbial but possibly thermogenic methane participated in the authigenic carbonate precipitation. Carbonate crust formation occurred below the water/sediment interface of the shallow Siberian Arctic shelf as a result of gas hydrate dissociation during Holocene warming events. The studied carbonate crusts were exhumated after precipitation into shallow subsurface shelf sediments.

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“…AMK 6027, 6045, and 6053 are the stations in the shelf edge area. MSp is the methane seep polygon [ 18 ].…”

Section: Figurementioning

confidence: 99%

“…The first data on microbial community composition and the rates of the methane cycle microbial processes in the Laptev Sea sediments and near-bottom water were obtained were obtained for a local 50 × 50 m polygon at the depth of 71 m [ 18 ]. The high methane oxidation rate in the sediments was shown to result from activity of a consortium of ANME-2 a/b archaea and sulfate-reducing bacteria.…”

Section: Introductionmentioning

confidence: 99%

Biogeochemical Activity of Methane-Related Microbial Communities in Bottom Sediments of Cold Seeps of the Laptev Sea

et al. 2023

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Bottom sediments at methane discharge sites of the Laptev Sea shelf were investigated. The rates of microbial methanogenesis and methane oxidation were measured, and the communities responsible for these processes were analyzed. Methane content in the sediments varied from 0.9 to 37 µmol CH4 dm−3. Methane carbon isotopic composition (δ13C-CH4) varied from −98.9 to −77.6‰, indicating its biogenic origin. The rates of hydrogenotrophic methanogenesis were low (0.4–5.0 nmol dm−3 day−1). Methane oxidation rates varied from 0.4 to 1.2 µmol dm−3 day−1 at the seep stations. Four ANME methanotrophic lineages (1, 2a–2b, 2c, and 3) (Methanosarciniales, phylum Halobacterota) were predominant (up to 46.3% of the whole community). Aerobic ammonium-oxidizing Crenarchaeota (family Nitrosopumilaceae) predominated in the upper sediments. Most archaea (up to 8%) were represented by new lineages, for which the metabolic pathways are presently unknown. Predominant bacteria in the upper sediments were heterotrophic Actinobacteriota and Bacteroidota. Members of the genera Sulfurovum and Sulfurimonas occurred in the sediments of the seep stations. Mehtanotrophs of the classes Alphaproteobacteria (Methyloceanibacter) and Gammaproteobacteria (families Methylophilaceae and Methylomonadaceae) occurred in the sediments of all stations. The microbial community composition was similar to that of methane seep sediments from geographically remote areas of the global ocean.

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Microbial Community Composition and Rates of the Methane Cycle Microbial Processes in the Upper Sediments of the Yamal Sector of the Southwestern Kara Sea

Cited by 11 publications

References 46 publications

Fast-growing Arctic Fe–Mn deposits from the Kara Sea as the refuges for cosmopolitan marine microorganisms

Fast-growing Arctic Fe–Mn deposits from the Kara Sea as the refuges for cosmopolitan marine microorganisms

Methane-Derived Authigenic Carbonates on the Seafloor of the Laptev Sea Shelf

Biogeochemical Activity of Methane-Related Microbial Communities in Bottom Sediments of Cold Seeps of the Laptev Sea

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