The Influence of Bioturbation on Iron and Sulphur Cycling in Marine Sediments: A Model Analysis

Velde, Sebastiaan van de; Meysman, Filip J. R.

doi:10.1007/s10498-016-9301-7

Cited by 90 publications

(87 citation statements)

References 85 publications

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“…5A). Because station AB is situated near the source of marine waters to the fjord, these observations agree with environmental studies suggesting that Mariprofundus is a strict marine iron oxidizer, while Gallionella is restricted to freshwater systems or maintains low abundance in marine systems (23,75).…”

supporting

confidence: 87%

“…Low organic matter quality and availability result in low sulfate reduction rates and thus limited sulfide production by sulfate-reducing microbes (14). This removes the pyrite sink for iron and allows reduced iron to be reoxidized either through biomixing or by microbial iron oxidizers (23). Thus, reduced iron can be oxidized either abiotically or via microbial catalysis (24).…”

mentioning

confidence: 99%

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Complex Microbial Communities Drive Iron and Sulfur Cycling in Arctic Fjord Sediments

Buongiorno

Herbert

Wehrmann

et al. 2019

Appl Environ Microbiol

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Glacial retreat is changing biogeochemical cycling in the Arctic, where glacial runoff contributes iron for oceanic shelf primary production. We hypothesize that in Svalbard fjords, microbes catalyze intense iron and sulfur cycling in loworganic-matter sediments. This is because low organic matter limits sulfide generation, allowing iron mobility to the water column instead of precipitation as iron monosulfides. In this study, we tested this with high-depth-resolution 16S rRNA gene libraries in the upper 20 cm at two sites in Van Keulenfjorden, Svalbard. At the site closer to the glaciers, iron-reducing Desulfuromonadales, iron-oxidizing Gallionella and Mariprofundus, and sulfur-oxidizing Thiotrichales and Epsilonproteobacteria were abundant above a 12-cm depth. Below this depth, the relative abundances of sequences for sulfate-reducing Desulfobacteraceae and Desulfobulbaceae increased. At the outer station, the switch from iron-cycling clades to sulfate reducers occurred at shallower depths (ϳ5 cm), corresponding to higher sulfate reduction rates. Relatively labile organic matter (shown by ␦ 13 C and C/N ratios) was more abundant at this outer site, and ordination analysis suggested that this affected microbial community structure in surface sediments. Network analysis revealed more correlations between predicted iron-and sulfur-cycling taxa and with uncultured clades proximal to the glacier. Together, these results suggest that complex microbial communities catalyze redox cycling of iron and sulfur, especially closer to the glacier, where sulfate reduction is limited due to low availability of organic matter. Diminished sulfate reduction in upper sediments enables iron to flux into the overlying water, where it may be transported to the shelf. IMPORTANCE Glacial runoff is a key source of iron for primary production in the Arctic. In the fjords of the Svalbard archipelago, glacial retreat is predicted to stimulate phytoplankton blooms that were previously restricted to outer margins. Decreased sediment delivery and enhanced primary production have been hypothesized to alter sediment biogeochemistry, wherein any free reduced iron that could potentially be delivered to the shelf will instead become buried with sulfide generated through microbial sulfate reduction. We support this hypothesis with sequencing data that showed increases in the relative abundance of sulfate reducing taxa and sulfate reduction rates with increasing distance from the glaciers in Van Keulenfjorden, Svalbard. Community structure was driven by organic geochemistry, suggesting that enhanced input of organic material will stimulate sulfate reduction in interior fjord sediments as glaciers continue to recede.

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confidence: 87%

mentioning

confidence: 99%

Complex Microbial Communities Drive Iron and Sulfur Cycling in Arctic Fjord Sediments

Buongiorno

Herbert

Wehrmann

et al. 2019

Appl Environ Microbiol

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“…Glud et al (2016) also use these in situ and other methods to understand carbon mineralization and nutrient turnover as a result of oxygen uptake and exchange across the water sediment interface. Organisms influence element cycling across the water-sediment interface via bioturbation, which has two major components [bio-mixing (solid particle transport) and bio-irrigation (enhance solute transport)] that Van de Velde and Meysman (2016) describe with a reactive transport model to further our understanding of iron and sulfur cycling. Savidge et al (2016) describe thermal fronts across this interface as a new thermal proxy to examine sediment-water exchange and provide a newly developed transport model to estimate the extent to which heat was transported by advection rather than conduction.…”

Section: Contributions By Colleagues To This Special Issuementioning

confidence: 99%

A Tribute to Rick and Debbie Jahnke: From Deep Sea Pore Water to Coastal Permeable Sediments-Contributions that Cover the Oceans

Shaw

Emerson

Windom³

2016

Aquat Geochem

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“…Temporal trends in carbonate carbon isotope composition have been recorded at varying timescales from million-year secular trends (Veizer et al, 1999;Zachos et al, 2001) to dramatic sub-million-year events, such as at the Paleocene-Eocene Thermal Maximum (Dickens et al, 1995). The sedimentary record of the Permian-Triassic (P-Tr) boundary interval, marked by the largest mass extinction of the Phanerozoic (Erwin, 1993;Alroy et al, 2008), is also characterized by pronounced carbon isotope excursions, which are almost exclusively recorded in bulk rock.…”

Section: Background: Permian-triassic Carbonate Carbon Isotope Recordsmentioning

confidence: 99%

“…Individual fossil carbonate shells are the preferred recorder of the isotope composition of marine dissolved inorganic carbon (DIC). However, some deposits, such as those of Precambrian age or those which were formed during biotic crises or where shelly fossils are absent, are not suitable for such a single-component approach (Veizer et al, 1999;Prokoph et al, 2008). Under these circumstances, bulk-rock samples are a widely used alternative recorder (Saltzman, 2001;Brand et al, 2012a, b).…”

Section: Introductionmentioning

confidence: 99%

Latest Permian carbonate-carbon isotope variability traces heterogeneous organic carbon accumulation and authigenic carbonate formation

Schobben¹,

Velde²,

Suchocka³

et al. 2017

Preprint

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Abstract. Bulk-carbonate carbon isotope measurements are a widely applied proxy for investigating the ancient biogeochemical carbon cycle. Temporal carbon isotope trends serve as a prime stratigraphic tool, with the inherent assumption that bulk micritic carbonate rock is a faithful geochemical recorder of the isotopic composition of seawater dissolved inorganic carbon. However, bulk-carbonate rock is also prone to incorporate diagenetic signals. The aim of the present study is to disentangle primary trends from diagenetic signals in carbon isotope records which traverse the Permian–Triassic boundary in marine carbonate-bearing sequences of Iran and South China. By pooling newly produced and published carbon isotope data we confirm that a global first-order trend towards depleted values exists. However, a large amount of scatter is superimposed on this geochemical record. In addition, we observe a temporal trend in the amplitude of this residual δ13C variability, which is reproducible for the two studied regions. We suggest that (sub)seafloor microbial communities and their control on calcite nucleation as well as on ambient porewater dissolved inorganic carbon-δ13C pose a viable mechanism to induce bulk-rock δ13C variability. Numerical model calculations highlight that early diagenetic carbonate rock stabilization, and linked carbon isotope alteration, can be controlled by organic matter supply and subsequent microbial remineralization. Low marine sulfate and a major biotic decline among late Permian bottom-dwelling organisms facilitated a spatial increase in heterogeneous organic carbon accumulation, causing varying degrees of carbon isotope overprint. A simulated time series suggests that a 50 % increase in the spatial scatter of organic carbon relative to the average, in addition to an imposed increase in the likelihood of sampling cements formed by microbial calcite nucleation to one out of 10 samples, is sufficient to induce the observed signal of carbon isotope variability. These findings put constraints on the application of Permian–Triassic carbon isotope chemostratigraphy based on whole-rock samples, which appears less refined than classical biozonation dating schemes. On the other hand, this signal of increased carbon isotope variability concurrent with the largest mass extinction of the Phanerozoic may inform about local carbon cycling mediated by spatially heterogeneous (sub)-seafloor microbial communities under suppressed bioturbation.

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The Influence of Bioturbation on Iron and Sulphur Cycling in Marine Sediments: A Model Analysis

Cited by 90 publications

References 85 publications

Complex Microbial Communities Drive Iron and Sulfur Cycling in Arctic Fjord Sediments

Complex Microbial Communities Drive Iron and Sulfur Cycling in Arctic Fjord Sediments

A Tribute to Rick and Debbie Jahnke: From Deep Sea Pore Water to Coastal Permeable Sediments-Contributions that Cover the Oceans

Latest Permian carbonate-carbon isotope variability traces heterogeneous organic carbon accumulation and authigenic carbonate formation

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