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

Пименов, Н. В.; Ulyanova, Marina; Канапацкий, Т. А.; Sivkov, Vadim; Ivanov, Mikhail

doi:10.1134/s0026261708050111

Cited by 16 publications

(7 citation statements)

References 10 publications

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“…Furthermore, the Barents Sea remains uncovered with ice during most of the year, while the Laptev Sea shelf is ice-free during one to two months annually. Other examples of shallow-water cold seeps with little or no macrofaunal response are also located in non-oligotrophic areas, such as the North Sea pockmark at 150 m depth with pelagic production up to 1,300 mg C m −2 per day (Moll, 1998;Dando et al, 1991) and the Baltic Sea pockmarks with >2,000 mg C m −2 per day in April (Lignell, 1990;Pimenov et al, 2008).…”

Section: Presence Of Specific Benthic Communities At C15 and Odenmentioning

confidence: 99%

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Fauna associated with shallow-water methane seeps in the Laptev Sea

Vedenin

Kokarev

Chikina

et al. 2020

PeerJ

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Background Methane seeps support unique benthic ecosystems in the deep sea existing due to chemosynthetic organic matter. In contrast, in shallow waters there is little or no effect of methane seeps on macrofauna. In the present study we focused on the recently described methane discharge area at the northern Laptev Sea shelf. The aim of this work was to describe the shallow-water methane seep macrofauna and to understand whether there are differences in macrobenthic community structure between the methane seep and background areas. Methods Samples of macrofauna were taken during three expeditions of RV Akademik Mstislav Keldysh in 2015, 2017 and 2018 using 0.1 m2 grabs and the Sigsbee trawl. 21 grabs and two trawls in total were taken at two methane seep sites named Oden and C15, located at depths of 60–70 m. For control, three 0.1 m2 grabs were taken in area without methane seepage. Results The abundance of macrofauna was higher at methane seep stations compared to non-seep sites. Cluster analysis revealed five station groups corresponding to control area, Oden site and C15 site (the latter represented by three groups). Taxa responsible for differences among the station groups were mostly widespread Arctic species that were more abundant in samples from methane seep sites. However, high densities of symbiotrophic siboglinids Oligobrachia sp. were found exclusively at methane seep stations. In addition, several species possibly new to science were found at several methane seep stations, including the gastropod Frigidalvania sp. and the polychaete Ophryotrocha sp. The fauna at control stations was represented only by well-known and widespread Arctic taxa. Higher habitat heterogeneity of the C15 site compared to Oden was indicated by the higher number of station groups revealed by cluster analysis and higher species richness in C15 trawl sample. The development of the described communities at the shallow-water methane seeps can be related to pronounced oligotrophic environment on the northern Siberian shelf.

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Section: Presence Of Specific Benthic Communities At C15 and Odenmentioning

confidence: 99%

“…In the Siberian Arctic, areas of intense methane discharge (methane seeps) were discovered on the outer shelf of the Laptev Sea in 2008(Yusupov et al, 2010. Further research revealed numerous gas flares in the northern Laptev Sea shelf Shakhova et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Fauna associated with shallow-water methane seeps in the Laptev Sea

Vedenin

Kokarev

Chikina

et al. 2020

PeerJ

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“…In contrast to active pockmarks their inactive counterparts have been studied to a limited extent in a microbiological perspective and then only in relation to the presence of biogenic methane or remains of hydrocarbon seepage [19] – [21] . Additionally, to the best of our knowledge we are not aware of studies comparing microbial communities of inactive pockmarks and the surrounding sediments that are not influenced by hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

Linking Geology and Microbiology: Inactive Pockmarks Affect Sediment Microbial Community Structure

2014

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Pockmarks are geological features that are found on the bottom of lakes and oceans all over the globe. Some are active, seeping oil or methane, while others are inactive. Active pockmarks are well studied since they harbor specialized microbial communities that proliferate on the seeping compounds. Such communities are not found in inactive pockmarks. Interestingly, inactive pockmarks are known to have different macrofaunal communities compared to the surrounding sediments. It is undetermined what the microbial composition of inactive pockmarks is and if it shows a similar pattern as the macrofauna. The Norwegian Oslofjord contains many inactive pockmarks and they are well suited to study the influence of these geological features on the microbial community in the sediment. Here we present a detailed analysis of the microbial communities found in three inactive pockmarks and two control samples at two core depth intervals. The communities were analyzed using high-throughput amplicon sequencing of the 16S rRNA V3 region. Microbial communities of surface pockmark sediments were indistinguishable from communities found in the surrounding seabed. In contrast, pockmark communities at 40 cm sediment depth had a significantly different community structure from normal sediments at the same depth. Statistical analysis of chemical variables indicated significant differences in the concentrations of total carbon and non-particulate organic carbon between 40 cm pockmarks and reference sample sediments. We discuss these results in comparison with the taxonomic classification of the OTUs identified in our samples. Our results indicate that microbial communities at the sediment surface are affected by the water column, while the deeper (40 cm) sediment communities are affected by local conditions within the sediment.

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“…Their localization is associated with the specific geomorphology of the bottom (depressions, craters, etc.). Similar methane craters (pockmarks), with gas saturated sediments and elevated methane levels in the near bottom water, were subsequently found in a number of sites within the Gdansk, Arkona, and Gotland Deeps [5,6].…”

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confidence: 99%

Sulfate reduction, methanogenesis, and methane oxidation in the Holocene sediments of the Vyborg Bay, Baltic Sea

et al. 2012

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Methane content and the rates of microbial processes of the carbon and sulfur cycles were deter mined for the sediments of the Vyborg Bay, Baltic Sea. Formation of the gas bearing surface sediments in the Vyborg Bay was found to depend on the activity of the modern microbial processes of the transformation of organic matter, resulting in production of significant amounts of reduced gases (methane and hydrogen sul fide). Rapid consumption of sulfate in the course of sulfate reduction coupled to organic matter decomposi tion both suppressed anaerobic oxidation of methane and promoted microbial methanogenesis. The gas bearing sediments of this area therefore become a source of methane, and methane concentration in the near bottom water increases significantly.

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

Cited by 16 publications

References 10 publications

Fauna associated with shallow-water methane seeps in the Laptev Sea

Fauna associated with shallow-water methane seeps in the Laptev Sea

Linking Geology and Microbiology: Inactive Pockmarks Affect Sediment Microbial Community Structure

Sulfate reduction, methanogenesis, and methane oxidation in the Holocene sediments of the Vyborg Bay, Baltic Sea

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