Microbial community of reduced pockmark sediments (Gdansk Deep, Baltic Sea)

Shubenkova, O. V.; Likhoshvai, A. V.; Канапацкий, Т. А.; Пименов, Н. В.

doi:10.1134/s0026261710060123

Cited by 10 publications

(9 citation statements)

References 19 publications

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“…Sulfurimonas sp. (Epsilonproteobacteria) and Euryarchaeota OTUs have previously mainly been detected in high abundance in deeper waters and sediments in the Baltic Sea (Labrenz et al, 2010;Shubenkova et al, 2010). Sulfurimonas species are known chemoautotrophic sulfate reducers typically found in high numbers, up to 25% of total prokaryotic abundance, in chemocline/deeper oxic-anoxic interphase waters (Grote et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

“…At the other end of the spectrum, seasonally confined populations (both transient and pulse) like Candidatus Spartobacteria baltica (LMO_000014) may be specialized in a given set of environmental parameters, such as DOC availability and composition (Gomez-Consarnau et al, 2012). (Epsilonproteobacteria) and Euryarchaeota OTUs have previously mainly been detected in high abundance in deeper waters and sediments in the Baltic Sea (Labrenz et al, 2010;Shubenkova et al, 2010). The appearance of the Sulfurimonas and Euryarchaeota OTUs emphasizes the contribution of physical mixing of the water column to seasonal dynamics during winter.…”

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confidence: 99%

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Disentangling seasonal bacterioplankton population dynamics by high‐frequency sampling

Lindh

Sjöstedt

Andersson

et al. 2015

Environmental Microbiology

129

174

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Multiyear comparisons of bacterioplankton succession reveal that environmental conditions drive community shifts with repeatable patterns between years. However, corresponding insight into bacterioplankton dynamics at a temporal resolution relevant for detailed examination of variation and characteristics of specific populations within years is essentially lacking. During 1 year, we collected 46 samples in the Baltic Sea for assessing bacterial community composition by 16S rRNA gene pyrosequencing (nearly twice weekly during productive season). Beta-diversity analysis showed distinct clustering of samples, attributable to seemingly synchronous temporal transitions among populations (populations defined by 97% 16S rRNA gene sequence identity). A wide spectrum of bacterioplankton dynamics was evident, where divergent temporal patterns resulted both from pronounced differences in relative abundance and presence/absence of populations. Rates of change in relative abundance calculated for individual populations ranged from 0.23 to 1.79 day(-1) . Populations that were persistently dominant, transiently abundant or generally rare were found in several major bacterial groups, implying evolution has favoured a similar variety of life strategies within these groups. These findings suggest that high temporal resolution sampling allows constraining the timescales and frequencies at which distinct populations transition between being abundant or rare, thus potentially providing clues about physical, chemical or biological forcing on bacterioplankton community structure.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Disentangling seasonal bacterioplankton population dynamics by high‐frequency sampling

Lindh

Sjöstedt

Andersson

et al. 2015

Environmental Microbiology

129

174

View full text Add to dashboard Cite

show abstract

“…Methanogenesis and anaerobic methane oxidation (AMO) are highest in the SMTZ, where methanogenic Methanosarcina may form syntrophic associations with acetate oxidizers, e.g. Geobacter (Rotaru et al, 2018), and ANME-1 Archaea may conduct both methanogenesis and AMO (Beulig et al, 2019); at other sites, ANME-1 and/or ANME-2 Archaea have been implicated in AMO (Myllykangas et al, 2020b;Shubenkovaa et al, 2010;Treude et al, 2005), including Fe-linked AMO (Rasigraf et al, 2020). For a recent review on biogeochemical processes and microbial life in Baltic Sea sediments, including the deep biosphere, see Jørgensen et al (2020).…”

Section: Role Of Benthic Microbial Communitiesmentioning

confidence: 99%

Biogeochemical functioning of the Baltic Sea

et al. 2022

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Abstract. Location, specific topography, and hydrographic setting together with climate change and strong anthropogenic pressure are the main factors shaping the biogeochemical functioning and thus also the ecological status of the Baltic Sea. The recent decades have brought significant changes in the Baltic Sea. First, the rising nutrient loads from land in the second half of the 20th century led to eutrophication and spreading of hypoxic and anoxic areas, for which permanent stratification of the water column and limited ventilation of deep-water layers made favourable conditions. Since the 1980s the nutrient loads to the Baltic Sea have been continuously decreasing. This, however, has so far not resulted in significant improvements in oxygen availability in the deep regions, which has revealed a slow response time of the system to the reduction of the land-derived nutrient loads. Responsible for that is the low burial efficiency of phosphorus at anoxic conditions and its remobilization from sediments when conditions change from oxic to anoxic. This results in a stoichiometric excess of phosphorus available for organic-matter production, which promotes the growth of N2-fixing cyanobacteria and in turn supports eutrophication. This assessment reviews the available and published knowledge on the biogeochemical functioning of the Baltic Sea. In its content, the paper covers the aspects related to changes in carbon, nitrogen, and phosphorus (C, N, and P) external loads, their transformations in the coastal zone, changes in organic-matter production (eutrophication) and remineralization (oxygen availability), and the role of sediments in burial and turnover of C, N, and P. In addition to that, this paper focuses also on changes in the marine CO2 system, the structure and functioning of the microbial community, and the role of contaminants for biogeochemical processes. This comprehensive assessment allowed also for identifying knowledge gaps and future research needs in the field of marine biogeochemistry in the Baltic Sea.

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“…Several studies have also provided evidence of unique bacterial taxa at intermediate salinities ( Crump et al, 2004 ; Kirchman et al, 2005 ; Kan et al, 2007 ; Herlemann et al, 2011 , 2016 ). However, studies of benthic bacterial diversity in the Baltic Sea have been limited to single stations ( Edlund et al, 2008 ; Shubenkova et al, 2010 ; Vetterli et al, 2015 ; Reyes et al, 2016 ), whereas systematic comparisons across the salinity gradient are lacking. Based on previous studies of the water column of the Baltic Sea ( Herlemann et al, 2011 ), we hypothesized in the present study that (1) salinity has a strong impact also on the community composition of sediment bacteria, (2) sediment bacterial richness does not reach a minimum under mesohaline conditions, and (3) unique bacterial taxa/groups are a frequent component of the bacterial communities in mesohaline sediments.…”

Section: Introductionmentioning

confidence: 99%

Benthic Bacterial Community Composition in the Oligohaline-Marine Transition of Surface Sediments in the Baltic Sea Based on rRNA Analysis

et al. 2018

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Salinity has a strong impact on bacterial community composition such that freshwater bacterial communities are very different from those in seawater. By contrast, little is known about the composition and diversity of the bacterial community in the sediments (bacteriobenthos) at the freshwater-seawater transition (mesohaline conditions). In this study, partial 16S-rRNA sequences were used to investigate the bacterial community at five stations, representing almost freshwater (oligohaline) to marine conditions, in the Baltic Sea. Samples were obtained from the silty, top-layer (0–2.5 cm) sediments with mostly oxygenated conditions. The long water residence time characteristic of the Baltic Sea, was predicted to enable the development of autochthonous bacteriobenthos at mesohaline conditions. Our results showed that, similar to the water column, salinity is a major factor in structuring the bacteriobenthos and that there is no loss of bacterial richness at intermediate salinities. The bacterial communities of marine, mesohaline, and oligohaline sediments differed in terms of the relative rRNA abundances of the major bacterial phyla/classes. At mesohaline conditions typical marine and oligohaline operational taxonomic units (OTUs) were abundant. Putative unique OTUs in mesohaline sediments were present only at low abundances, suggesting that the mesohaline environment consists mainly of marine and oligohaline bacteria with a broad salinity tolerance. Our study provides a first overview of the diversity patterns and composition of bacteria in the sediments along the Baltic Sea salinity gradient as well as new insights into the bacteriobenthos at mesohaline conditions.

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Microbial community of reduced pockmark sediments (Gdansk Deep, Baltic Sea)

Cited by 10 publications

References 19 publications

Disentangling seasonal bacterioplankton population dynamics by high‐frequency sampling

Disentangling seasonal bacterioplankton population dynamics by high‐frequency sampling

Biogeochemical functioning of the Baltic Sea

Benthic Bacterial Community Composition in the Oligohaline-Marine Transition of Surface Sediments in the Baltic Sea Based on rRNA Analysis

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