Microbial community composition and biogeochemical processes in cold-water coral carbonate mounds in the Gulf of Cadiz, on the Moroccan margin

Templer, Stefanie P; Wehrmann, Laura Mariana; Vásconcelos, Crisógono; McKenzie, Judith A.

doi:10.1016/j.margeo.2010.10.020

Cited by 13 publications

(9 citation statements)

References 73 publications

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“…Peckmann et al, 2001;Peckmann and Thiel, 2004;Konshauser, 2007;Birgel et al, 2008). Precipitation of microbial-induced carbonates or sulphides cannot be c1early assumed from textural observations, but the physico-chemical environmental conditions are suitable for microbial activity, and biomineralisation-microbial communities have been reported in the area (Niemann et al, 2006;Stadnitskaia et al, 2008;Templer et al, 2011). These findings allow us to infer these textural features as indications of microbial-induced mineralisation processes.…”

Section: Stage One: the Diagenetic Processmentioning

confidence: 99%

Ferromanganese nodules and micro-hardgrounds associated with the Cadiz Contourite Channel (NE Atlantic): Palaeoenvironmental records of fluid venting and bottom currents

et al. 2012

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Section: Stage One: the Diagenetic Processmentioning

confidence: 99%

Ferromanganese nodules and micro-hardgrounds associated with the Cadiz Contourite Channel (NE Atlantic): Palaeoenvironmental records of fluid venting and bottom currents

et al. 2012

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“…In deep cold-water coral ecosystems, insight into the distribution and variability of microbial communities is now also progressing. Research has begun to reveal patterns in the composition of microbial communities associated with coldwater corals (Emblem et al, 2012;Galkiewicz et al, 2011;Hansson et al, 2009;Kellogg et al, 2009;Neulinger et al, 2009;Neulinger et al, 2008;Penn et al, 2006;Schöttner et al, 2009;Schöttner et al, 2012;Yakimov et al, 2006) and the ambient environment (Jensen et al, 2012(Jensen et al, , 2014Jensen et al, 2008;Schöttner et al, 2012;Templer et al, 2011). Schöttner et al (2012) concluded that bacteria in coastal cold-water coral reefs are structured based on habitat (coral branch, mucus, water and sediment) and reef location (four reefs located off Norway).…”

Section: Introductionmentioning

confidence: 99%

Microbial assemblages on a cold-water coral mound at the SE Rockall Bank (NE Atlantic): interactions with hydrography and topography

et al. 2015

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This study characterizes the microbial community composition over Haas Mound, one of the most prominent cold-water coral mounds of the Logachev Mound province (Rockall Bank, NE Atlantic). We outline patterns of distribution vertically -from the seafloor to the water column -and laterally -across the mound -and couple these to mound topography and hydrography. Samples of water, sediment and Lophelia pertusa were collected in 2012 and 2013 from locations that were chosen based on high definition video surveys. Temperature and current measurements were obtained at two sites at the summit and foot of Haas Mound to study near-bed hydrodynamic conditions. Overlaying water was collected from depths of 400 m as well as 5 and 10 m above the bottom using a CTD/Rosette system. Near-bottom water, sediment and L. pertusa mucus and skeleton samples were obtained with a box corer. Of all these biotopes, Roche GS-FLX amplicon sequencing targeting both Bacteria and Archaea was carried out, augmenting our understanding of deep sea microbial consortia. The pattern of similarities between samples, visualized by multi-dimensional scaling (MDS), indicates a strong link between the distribution of microbes and the specific biotopes. The microbial operational taxonomic unit (OTU) diversity was the highest in near-bottom water, which was sampled in the coral framework. For the first time, Thaumarchaeota marine group I (MGI) were found in L. pertusa mucus; Endozoicomonas was detected in skeleton, mucus and near-bottom water, whereas Mycoplasma was only detected in skeleton and near-bottom water, however not in mucus. Analysis of similarities (ANOSIM) indicates that overlaying water is well-mixed at 400 m depth but less so at 5 and 10 m above the bottom, where the composition of microbial communities differed significantly between summit, slope and off-mound. At all locations, the near-bottom water differed significantly from water at 5 m above the bottom, illustrating that the near-bottom water in between the coral framework represents a separate microbial habitat. Furthermore, the observed spatial heterogeneity in microbial communities is discussed in relation to environmental conditions. Published by CopernicusPublications on behalf of the European Geosciences Union. J. D. L. van Bleijswijk et al.: Microbial assemblages on a cold-water coral mound 1000 m 12 9 11 8 24 15 25 46 72 lander

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“…However, elevated DAGE contents (167 and 265 cm depths; Figure ) points to a link with organoclastic sulphate reduction (see Grossi et al, ). Evidence for pronounced organoclastic sulphate reduction has been observed in Alpha Mound sediments before (Rejas et al, ; Templer et al, ; Wehrmann et al, ), rendering it likely that this process plays a role in Ca‐excess dolomite formation due to an increase of alkalinity induced by this process (Wehrmann, Titschack, Böttcher, & Ferdelman, ).…”

Section: Discussion and Interpretationmentioning

confidence: 99%

“…Today, methane gas has been measured in the pore waters of Alpha Mound, but no active bubbling of gas has been observed at its surface (Van Rooij et al, ; Wehrmann et al, ). Previous studies have used Alpha Mound as a model for investigating the impact of methane seepage on CWC mound sediments (Maignien et al, ; Pirlet et al, ; Templer, Wehrmann, Zhang, Vasconcelos, & McKenzie, ; Wehrmann et al, ). Various proxies (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Constraining the formation of authigenic carbonates in a seepage‐affected cold‐water coral mound by lipid biomarkers

et al. 2020

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Cold‐water coral (CWC) mounds are build‐ups comprised of coral‐dominated intervals alternating with a mixed carbonate‐siliciclastic matrix. At some locations, CWC mounds are influenced by methane seepage, but the impact of methane on CWC mounds is poorly understood. To constrain the potential impact of methane on CWC mound growth, lipid biomarker investigations were combined with mineralogical and petrographic analyses to investigate the anaerobic oxidation of methane (AOM) and authigenic carbonate formation in sediment from a seep‐affected CWC mound in the Gulf of Cadiz. The occurrence of AOM was confirmed by characteristic lipids found within a semi‐lithified zone (SLZ) consisting of authigenic aragonite, high‐magnesium calcite and calcium‐excess dolomite. The formation of high‐Mg calcite is attributed to AOM, acting as a lithifying agent. Aragonite is only a minor phase. Ca‐excess dolomite in the SLZ and upper parts may be formed by organoclastic sulphate reduction, favouring precipitation by increased alkalinity. The AOM biomarkers in the SLZ include isoprenoid‐based archaeal membrane lipids, such as abundant glycerol dibiphytanyl glycerol tetraethers (GDGTs) dominated by GDGT‐2. The δ13C values of GDGT‐2, measured as ether‐cleaved monocyclic biphytanes, are as low as −100‰ versus V‐PDB. Further, bacterial dialkyl glycerol diethers with two anteiso‐C15 alkyl chains and δ13C values of −81‰ are interpreted as biomarkers of sulphate‐reducing bacteria. The lipid biomarker signatures and mineralogical patterns suggest that anaerobic methane‐oxidizing archaea of the ANME‐1 group thrived in the subsurface at times of slow and diffusive methane seepage. Petrographic analyses revealed that the SLZ was exhumed at some point (e.g. signs of bioerosion of the semi‐lithified sediment), providing a hard substrate for CWC larval settlement. In addition, this work reveals that AOM‐induced semi‐lithification likely played a role in mound stabilization. Lipid biomarker analysis proves to be a powerful tool to disentangle early diagenetic processes induced by microbial metabolisms.

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Microbial community composition and biogeochemical processes in cold-water coral carbonate mounds in the Gulf of Cadiz, on the Moroccan margin

Cited by 13 publications

References 73 publications

Ferromanganese nodules and micro-hardgrounds associated with the Cadiz Contourite Channel (NE Atlantic): Palaeoenvironmental records of fluid venting and bottom currents

Ferromanganese nodules and micro-hardgrounds associated with the Cadiz Contourite Channel (NE Atlantic): Palaeoenvironmental records of fluid venting and bottom currents

Microbial assemblages on a cold-water coral mound at the SE Rockall Bank (NE Atlantic): interactions with hydrography and topography

Constraining the formation of authigenic carbonates in a seepage‐affected cold‐water coral mound by lipid biomarkers

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