Biogeochemical Consequences of Nonvertical Methane Transport in Sediment Offshore Northwestern Svalbard

Treude, Tina; Krause, Stefan; Steinle, Lea; Burwicz, Ewa; Hamdan, Leila J.; Niemann, Helge; Feseker, Tomas; Liebetrau, Volker; Krastel, Sebastian; Berndt, Christian

doi:10.1029/2019jg005371

Cited by 15 publications

(9 citation statements)

References 105 publications

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“…Control samples were first terminated before addition of tracer. In the home laboratory, methane oxidation rates and methane concentrations in the sample vials were determined according to Treude et al 61 .…”

Section: Methodsmentioning

confidence: 99%

Influence of methane seepage on isotopic signatures in living deep-sea benthic foraminifera, 79° N

Melaniuk

Sztybor

Treude

et al. 2022

Sci Rep

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Fossil benthic foraminifera are used to trace past methane release linked to climate change. However, it is still debated whether isotopic signatures of living foraminifera from methane-charged sediments reflect incorporation of methane-derived carbon. A deeper understanding of isotopic signatures of living benthic foraminifera from methane-rich environments will help to improve reconstructions of methane release in the past and better predict the impact of future climate warming on methane seepage. Here, we present isotopic signatures (δ13C and δ18O) of foraminiferal calcite together with biogeochemical data from Arctic seep environments from c. 1200 m water depth, Vestnesa Ridge, 79° N, Fram Strait. Lowest δ13C values were recorded in shells of Melonis barleeanus, − 5.2‰ in live specimens and − 6.5‰ in empty shells, from sediments dominated by aerobic (MOx) and anaerobic oxidation of methane (AOM), respectively. Our data indicate that foraminifera actively incorporate methane-derived carbon when living in sediments with moderate seepage activity, while in sediments with high seepage activity the poisonous sulfidic environment leads to death of the foraminifera and an overgrowth of their empty shells by methane-derived authigenic carbonates. We propose that the incorporation of methane-derived carbon in living foraminifera occurs via feeding on methanotrophic bacteria and/or incorporation of ambient dissolved inorganic carbon.

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Section: Methodsmentioning

confidence: 99%

Influence of methane seepage on isotopic signatures in living deep-sea benthic foraminifera, 79° N

Melaniuk

Sztybor

Treude

et al. 2022

Sci Rep

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“…Model-derived methane uxes from Storfjordrenna cores GC1045 and 1081 are an order of magnitude higher than those from seeps associated with pockmark features at Vestnessa Ridge, west of Svalbard 45 . When compared to other estimates across continental margins worldwide, the values we report for these two cores are high but well within reported ranges, while uxes from steady-state cores fall within the middle 46 .…”

Section: Discussionmentioning

confidence: 82%

Distinct methane-driven biogeochemical regimes in Arctic seafloor gas hydrate mounds

Klasek¹,

Hong²,

Torres³

et al. 2020

Preprint

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Archaea mediating anaerobic methane oxidation are key in preventing methane produced in marine sediments from reaching the hydrosphere; however, a complete understanding of how microbial communities in natural settings respond to changes in methane flux remains largely uncharacterized. We investigate microbial communities in gas hydrate-bearing seafloor mounds at Storfjordrenna, offshore Svalbard in the high Arctic, where distinct methane flux regimes ranging from steady-state dynamics, recent increase in subsurface diffusive flux, and gas seepage were identified. Populations of anaerobic methanotrophs and sulfate-reducing bacteria were highest at the seep site, while a recent increase in methane influx was associated with decreased community diversity. Despite high methane fluxes and methanotroph doubling times estimated at 5-9 months, microbial community responses were largely synchronous with the advancement of methane into shallower sediment horizons. Together, these provide a framework for interpreting subseafloor microbial responses to methane escape in a changing Arctic.

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“…Pore‐water nitrate and nitrite concentration (NO x ) was determined using chemiluminescence analyzer (Thermo) following the vanadium reduction to NO method (Braman and Hendrix 1989). Sulfate concentration was determined by ion chromatography (Methrom, IC Compact 761) at the University of California Los Angeles (Treude et al 2020).…”

Section: Methodsmentioning

confidence: 99%

Deep‐sea wooden shipwrecks influence sediment microbiome diversity

Hampel

Moseley

Mugge

et al. 2022

Limnology & Oceanography

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Historic shipwrecks function as habitats for benthic organisms by providing food, refuge, and structure. They also form islands of biodiversity on the seabed, shaping microbial ecology and ecosystem processes. This study examined two wooden deep-sea shipwrecks at 525 and 1800 m water depth and probed their influence on sediment microbiomes and geochemistry. Microbiomes were investigated with 16S rRNA gene amplicon sequencing along 60 m transects extending in four directions from the hulls of the shipwrecks. Distance from shipwrecks and sediment depth both shaped microbiome structure. Archaeal alpha diversity was significantly and positively correlated with proximity to the deeper shipwreck while bacterial diversity was not to either. Archaeal community structure differed at both sites; the deeper site had a higher proportion of Bathyarchaeia and Lokiarchaeia proximate to shipwreck compared to the shallow location. Major bacterial communities were consistent at both sites, however, at the deeper site had higher abundance of Bacteroidetes, Chloroflexi, Desulfofarculales, and Desulfobacteriales. Core microbiome and differential abundance analyses revealed unique taxa nearest the shipwrecks compared to the surrounding seabed including organoheterotrophs, and cellulolytic and sulfur cycling taxa. Sediment carbon content influenced microbiome structure near the shipwrecks (5-10 m). We show that shipwrecks have a distinct sediment microbiome and form unique habitat patches on seabed, resembling those surrounding organic falls. The shipwreck influence was more pronounced at the deeper site, further from terrestrial influences signaling shipwrecks may be a significant source of organic matter in far-shore oligotrophic settings.

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Biogeochemical Consequences of Nonvertical Methane Transport in Sediment Offshore Northwestern Svalbard

Cited by 15 publications

References 105 publications

Influence of methane seepage on isotopic signatures in living deep-sea benthic foraminifera, 79° N

Influence of methane seepage on isotopic signatures in living deep-sea benthic foraminifera, 79° N

Distinct methane-driven biogeochemical regimes in Arctic seafloor gas hydrate mounds

Deep‐sea wooden shipwrecks influence sediment microbiome diversity

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