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

Berndmeyer, C.; Thiel, Volker; Schmale, Oliver; Wasmund, Norbert; Blumenberg, Martin

doi:10.5194/bg-11-7009-2014

Cited by 20 publications

(11 citation statements)

References 113 publications

(128 reference statements)

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“…It is noteworthy that previous water column studies in OMZs have reported a significantly lower BHP structural diversity (Berndmeyer et al., 2014; Blumenberg et al., 2007; Kharbush et al., 2013; Sáenz et al., 2011; Wakeham et al., 2007) than observed in this study. We attribute this increase in the number of identified structures to the higher sensitivity and resolving power of the Orbitrap system used for analysis.…”

Section: Discussioncontrasting

confidence: 56%

Bacterial and archaeal lipids trace chemo(auto)trophy along the redoxcline in Vancouver Island fjords

et al. 2021

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Marine oxygen minimum zones play a crucial role in the global oceanic carbon, nitrogen, and sulfur cycles as they harbor microbial communities that are adapted to the water column chemistry and redox zonation, and in turn control the water column chemistry and greenhouse gas release. These micro‐organisms have metabolisms that rely on terminal electron acceptors other than O2 and often benefit from syntrophic relationships (metabolic coupling). Here, we study chemo(auto)trophy along the redoxcline in two stratified fjords on Vancouver Island (Canada) using bacterial bacteriohopanepolyols and archaeal ether lipids. We analyze the distribution of these lipid classes in suspended particulate matter (SPM) to trace ammonia oxidation, anaerobic ammonium oxidation (anammox), sulfate reduction/sulfur oxidation, methanogenesis, and methane oxidation, and investigate ecological niches to evaluate potential links between their respective bacterial and archaeal sources. Our results show an unparalleled BHP and ether lipid structural diversity that allows tracing the major redox‐driven metabolic processes at the time of sampling: Both fjords are dominated by archaeal ammonia oxidation and anammox; sulfate‐reducing bacteria may be present in Deer Bay, but absent from Effingham Inlet; methanogenic Euryarchaeota and archaeal and bacterial methanotrophs are detectable at low abundance. Correlation analysis reveals distinct biomarker clusters that provide constraints on the biogeochemical niches of some orphan BHP and ether lipids such as in situ‐produced adenosyl‐BHPs or unsaturated archaeols.

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Section: Discussioncontrasting

confidence: 56%

Bacterial and archaeal lipids trace chemo(auto)trophy along the redoxcline in Vancouver Island fjords

et al. 2021

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“…At 1-μ M S ÀII almost all HgS (S) dissolves and forms HgS 2 H À (aq) and Hg (SH) 2 0 (aq) . POM concentrations are lower in anoxic water than in normoxic water in the Baltic Sea (Berndmeyer et al, 2014;Nausch et al, 2008), which further contributes to a high dissolved Hg II fraction and slow settling to sediments. This process prolongs the lifetime of Hg II in the anoxic water column and increases the Hg II reservoir readily available for methylation.…”

Section: A Conceptual Model Of Hg Dynamics Across the Redoxclinementioning

confidence: 99%

Deciphering the Role of Water Column Redoxclines on Methylmercury Cycling Using Speciation Modeling and Observations From the Baltic Sea

Soerensen

Schartup

Skrobonja

et al. 2018

Global Biogeochemical Cycles

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Oxygen‐depleted areas are spreading in coastal and offshore waters worldwide, but the implication for production and bioaccumulation of neurotoxic methylmercury (MeHg) is uncertain. We combined observations from six cruises in the Baltic Sea with speciation modeling and incubation experiments to gain insights into mercury (Hg) dynamics in oxygen depleted systems. We then developed a conceptual model describing the main drivers of Hg speciation, fluxes, and transformations in water columns with steep redox gradients. MeHg concentrations were 2–6 and 30–55 times higher in hypoxic and anoxic than in normoxic water, respectively, while only 1–3 and 1–2 times higher for total Hg (THg). We systematically detected divalent inorganic Hg (HgII) methylation in anoxic water but rarely in other waters. In anoxic water, high concentrations of dissolved sulfide cause formation of dissolved species of HgII: HgS2H−(aq) and Hg (SH)20(aq). This prolongs the lifetime and increases the reservoir of HgII readily available for methylation, driving the high MeHg concentrations in anoxic zones. In the hypoxic zone and at the hypoxic‐anoxic interface, Hg concentrations, partitioning, and speciation are all highly dynamic due to processes linked to the iron and sulfur cycles. This causes a large variability in bioavailability of Hg, and thereby MeHg concentrations, in these zones. We find that zooplankton in the summertime are exposed to 2–6 times higher MeHg concentrations in hypoxic than in normoxic water. The current spread of hypoxic zones in coastal systems worldwide could thus cause an increase in the MeHg exposure of food webs.

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“…1a) is ubiquitous in the environment (Bisseret and Rohmer, 1989;Talbot et al, 2003;Talbot and Farrimond, 2007) and has been shown to be produced by a diverse array of bacteria (Rohmer et al, 1984;Talbot et al, 2007a;Talbot and Farrimond, 2007 and references therein). Marine suspended particulate matter (SPM) from anoxic and low-oxygen water columns and marine sediments have also been found to contain a late-eluting BHT isomer (Berndmeyer et al, 2014(Berndmeyer et al, , 2013Blumenberg et al, 2010;Kharbush et al, 2013;Kusch et al, 2018;Rush et al, 2014;Sáenz et al, 2011;Wakeham et al, 2012). The fractional abundance of late-eluting 'marine BHT isomer' was proposed as a way to assess anoxia levels in marine environments, as the ratio of BHT isomer to BHT was found to correlate with anoxia in multiple marine environments (Sáenz et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

A unique bacteriohopanetetrol stereoisomer of marine anammox

Schwartz-Narbonne¹,

Schaeffer²,

Hopmans³

et al. 2019

Preprint

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Anaerobic ammonium oxidation (anammox) is a significant process for bioavailable nitrogen removal from marine systems. A bacteriohopanetetrol (BHT) isomer, with unknown stereochemistry, eluting later than BHT using high performance liquid chromatography (HPLC), was detected in ‘Ca. Scalindua profunda’ and proposed as a biomarker for anammox in marine paleo-environments. Four non-marine, non-anammox genera also produce late-eluting BHT stereoisomers. Of these, the stereochemistry in Acetobacter pasteurianus, Komagataeibacter xylinus and Frankia sp. was shown to be 17β, 21β(H), 22R, 32R, 33R, 34R (BHT-34R), while the stereochemistry of the late-eluting BHT in Methylocella palustris was unknown. We studied the BHT distributions and stereochemistry of these known BHT isomer producers and of previously unscreened marine (‘Ca. Scalindua brodeae’) and freshwater (‘Ca. Brocadia sp.’) anammox species and genera using HPLC and gas chromatographic (GC) analysis of acetylated BHTs and ultra high performance liquid chromatography (UHPLC)-High Resolution Mass Spectrometry (HRMS) analysis of non-acetylated BHTs. The 34R stereochemistry was confirmed for the BHT isomers in Ca. Brocadia sp., and Methylocella palustris. However, ‘Ca. Scalindua sp.’ synthesise a stereochemically distinct BHT isomer, with a still unconfirmed stereochemistry (BHT-x). ‘Ca. Kuenenia sp.’ was confirmed not to produce any late-eluting BHT stereoisomers. Only GC analysis of acetylated BHT and UHPLC analysis of non-acetylated BHT distinguished between late-eluting BHT isomers. Acetylated BHT-x and BHT-34R co-elute by HPLC. As BHT-x is so far only known to be produced by ‘Ca. Scalindua spp.’, it may be applied as a biomarker for marine anammox. As ‘Ca. Brocadia sp.’ produces BHT-34R, this BHT isomer is a potential, albeit less specific, biomarker for anammox in non-marine settings.

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

Cited by 20 publications

References 113 publications

Bacterial and archaeal lipids trace chemo(auto)trophy along the redoxcline in Vancouver Island fjords

Bacterial and archaeal lipids trace chemo(auto)trophy along the redoxcline in Vancouver Island fjords

Deciphering the Role of Water Column Redoxclines on Methylmercury Cycling Using Speciation Modeling and Observations From the Baltic Sea

A unique bacteriohopanetetrol stereoisomer of marine anammox

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