Molecular signals for anaerobic methane oxidation in Black Sea seep carbonates and a microbial mat

Thiel, Volker; Peckmann, Jörn; Richnow, Hans H.; Luth, Ulf; Reitner, Joachim; Michaelis, Walter

doi:10.1016/s0304-4203(00)00099-2

Cited by 240 publications

(143 citation statements)

References 48 publications

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“…Likewise, δ 13 C values could not be obtained for archaeol and PMI due to low compound concentrations, which makes statements on inputs of these lipids from archaea involved in the sulfate-dependent anaerobic oxidation of methane (AOM) impossible (cf. Hinrichs et al, 1999;Thiel et al, 2001). Whereas it has been shown that AOM is theoretically possible in the anoxic zone of the Landsort Deep and anaerobic methane consumption has recently been demonstrated to occur (Jakobs et al, 2013), clear evidence for abundant AOM is as yet lacking and requires further investigations focused on the anoxic water bodies of the Baltic Sea.…”

Section: Microbial Processes In the Anoxic Zonementioning

confidence: 99%

Biomarkers in the stratified water column of the Landsort Deep (Baltic Sea)

et al. 2014

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Abstract. The water column of the Landsort Deep, central Baltic Sea, is stratified into an oxic, suboxic, and anoxic zone. This stratification controls the distributions of individual microbial communities and biogeochemical processes. In summer 2011, particulate organic matter was filtered from these zones using an in situ pump. Lipid biomarkers were extracted from the filters to establish water-column profiles of individual hydrocarbons, alcohols, phospholipid fatty acids, and bacteriohopanepolyols (BHPs). As a reference, a cyanobacterial bloom sampled in summer 2012 in the central Baltic Sea Gotland Deep was analyzed for BHPs. The biomarker data from the surface layer of the oxic zone showed major inputs from cyanobacteria, dinoflagellates, and ciliates, while the underlying cold winter water layer was characterized by a low diversity and abundance of organisms, with copepods as a major group. The suboxic zone supported bacterivorous ciliates, type I aerobic methanotrophic bacteria, sulfate-reducing bacteria, and, most likely, methanogenic archaea. In the anoxic zone, sulfate reducers and archaea were the dominating microorganisms as indicated by the presence of distinctive branched fatty acids: archaeol and pentamethylicosane (PMI) derivatives, respectively. Our study of in situ biomarkers in the Landsort Deep thus provided an integrated insight into the distribution of relevant compounds and describes useful tracers to reconstruct stratified water columns in the geological record.

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Section: Microbial Processes In the Anoxic Zonementioning

confidence: 99%

Biomarkers in the stratified water column of the Landsort Deep (Baltic Sea)

et al. 2014

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“…4.1.A.). The region is wellknown for abundant gas seeps, carbonate buildups and shallow gas (Polikarpov et al, 1989;Polikarpov et al, 1992;Egorov et al, 1998;Luth et al, 1999;Peckmann et al, 2001;Thiel et al, 2001;Amouroux et al, 2002;Michaelis et al, 2002;Kruglyakova et al, 2004;Kutas et al, 2004;Popescu et al, 2004;Pape et al, 2005;Pimenov and Ivanova, 2005;Reitner et al, 2005;Schmale et al, 2005;Treude et al, 2005;McGinnis et al, 2006;Naudts et al, 2006). During the 58 th (May-June 2003) and 60 th (MayJune 2004) cruise of R.V.…”

Section: Study Areamentioning

confidence: 99%

Anomalous sea-floor backscatter patterns in methane venting areas, Dnepr paleo-delta, NW Black Sea

et al. 2008

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The relation between acoustic seafloor backscatter and seep distribution is examined by integrating multibeam backscatter data and seep locations detected by single-beam echosounder. This study is further supported by side scan sonar recordings, high-resolution 5 kHz seismic data, pore-water analysis, grain-size analysis and visual seafloor observations. The datasets were acquired during the 2003 and 2004 expeditions of the EC-funded CRIMEA project in the Dnepr paleo-delta area, northwestern Black Sea.More than 600 active methane seeps were hydro-acoustically detected within a small (3.96 km by 3.72 km) area on the continental shelf of the Dnepr paleo-delta in water depths ranging from -72 m to -156 m. Multibeam and side scan sonar recordings show backscatter patterns that are clearly associated with seepage or with a present dune area. Seeps generally occur within medium-to highbackscatter areas which often coincide with pockmarks.High-resolution seismic data reveal the presence of an undulating gas front, i.e. the top of the free gas in the subsurface, which domes up towards and intersects the seafloor at locations where gas seeps and medium-to high-backscatter values are detected. Pore-water analysis of 4 multi-cores, taken at different backscatter intensity sites, shows a clear correlation between backscatter intensity and dissolved methane fluxes. All analyzed chemical species indicate increasing anaerobic oxidation of methane (AOM) from medium-to high-backscatter locations. This is confirmed by visual seafloor observations, showing bacterial mats and authigenic carbonates formed by AOM. Grain-size analysis of the 4 multi-cores only reveals negligible variations between the different backscatter sites.Integration of all datasets leads to the conclusion that the observed backscatter patterns are the result of ongoing methane seepage and the precipitation of methane-derived authigenic carbonates (MDACs) caused by AOM. The carbonate formation also appears to lead to a gradual (self-)sealing of the seeps by cementing fluid pathways/horizons followed by a relocation of the bubble-releasing locations. KeywordsMethane seeps; acoustic seafloor backscatter; anaerobic oxidation of methane; bacterial mats; pockmarks; methane-derived authigenic carbonates

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“…Implications for the sedimentary record of marine hopanoids To date, the sources of geohopanes have been identified based on correlation with the distribution of hopanoids in cultured bacteria (for example, Rohmer et al, 1984;Zundel and Rohmer, 1985a;Summons et al, 1999;Talbot et al, 2001), or based on the presence of unique isotopic signatures harbored by selected compounds (Elvert et al, 2000;Pancost et al, 2000;Hinrichs, 2001;Thiel et al, 2001). Examples of the latter include numerous instances of 13 C-depleted 3-methylhopanes, which are attributed to type I methanotrophs of the g-Proteobacteria (Zundel and Rohmer, 1985a, b).…”

Section: Phylogenetic Analysis Of A-proteobacterial Shcsmentioning

confidence: 99%

Distribution of microbial terpenoid lipid cyclases in the global ocean metagenome

Pearson

Rusch

2008

The ISME Journal

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The bacterial terpenoid lipids known as hopanoids are fundamental tools for interpreting ancient microbial communities. Their degradation products, the hopanes, are found in sedimentary rocks throughout the geologic record. These compounds are presumed to be analogous to the sterols of eukaryotes, yet although the eukaryotic requirement for sterols is universal, hopanoid biosynthetic capacity is not ubiquitous among marine bacteria. Among the 9.8 million shotgun reads from the Sorcerer II Global Ocean Sampling (GOS) expedition, 148 contain putative coding sequence for bacterial squalene-hopene cyclases (SHCs). SHCs encoded by a-Proteobacteria potentially related to Rhodospirillaceae dominate these hits, especially in the open ocean and in tropical regions. Planctomycetes and b-Proteobacteria contribute more SHC-encoding sequences, and therefore presumably more hopanoid production, to coastal and temperate environments. Although sequences nominally related to a-and b-Proteobacteria outnumber other taxa in marine and coastal environments, there is large phylogenetic distance between GOS sequences and known species. Assuming that the environments sampled here are broadly representative of a wide range of surface ocean climates, depositional settings and temporal periods, the data suggest a fundamental function for Proteobacteria in the development of the geologic record of hopanes.

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Molecular signals for anaerobic methane oxidation in Black Sea seep carbonates and a microbial mat

Cited by 240 publications

References 48 publications

Biomarkers in the stratified water column of the Landsort Deep (Baltic Sea)

Biomarkers in the stratified water column of the Landsort Deep (Baltic Sea)

Anomalous sea-floor backscatter patterns in methane venting areas, Dnepr paleo-delta, NW Black Sea

Distribution of microbial terpenoid lipid cyclases in the global ocean metagenome

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