The impact of electrogenic sulfide oxidation on elemental cycling and solute fluxes in coastal sediment

Rao, Alexandra; Malkin, Sairah Y.; Hidalgo‐Martinez, Silvia; Meysman, Filip J. R.

doi:10.1016/j.gca.2015.09.014

Cited by 88 publications

(167 citation statements)

References 65 publications

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“…However, one complicating factor is that the activity of cable bacteria strongly influences the seasonal pattern of sediment geochemical cycles in Lake Grevelingen. These electrogenic bacteria induce strong shifts in the sediment geochemistry (Seitaj et al, , 2017SuluGambari et al, 2016a, b) and lead to substantial Mn 2+ mobilization in pore waters (Rao et al, 2016;Sulu-Gambari et al, 2016b;van de Velde et al, 2016). These cable bacteria tend to have a highly patchy distribution, which hence could complicate the interpretation (Sulu-Gambari et al, 2016b;Seitaj et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Mn∕Ca intra- and inter-test variability in the benthic foraminifer <i>Ammonia tepida</i>

et al. 2018

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Abstract. The adaptation of some benthic foraminiferal species to low-oxygen conditions provides the prospect of using the chemical composition of their tests as proxies for bottom water oxygenation. Manganese may be particularly suitable as such a geochemical proxy because this redox element is soluble in reduced form (Mn 2+ ) and hence can be incorporated into benthic foraminiferal tests under low-oxygen conditions. Therefore, intra-and inter-test differences in foraminiferal Mn/Ca ratios may hold important information about short-term variability in pore water Mn 2+ concentrations and sediment redox conditions. Here, we studied Mn/Ca intra-and inter-test variability in living individuals of the shallow infaunal foraminifer Ammonia tepida sampled in Lake Grevelingen (the Netherlands) in three different months of 2012. The deeper parts of this lake are characterized by seasonal hypoxia/anoxia with associated shifts in microbial activity and sediment geochemistry, leading to seasonal Mn 2+ accumulation in the pore water. Earlier laboratory experiments with similar seawater Mn 2+ concentrations as encountered in the pore waters of Lake Grevelingen suggest that intra-test variability due to ontogenetic trends (i.e. size-related effects) and/or other vital effects occurring during calcification in A. tepida (11-25 % relative SD, RSD) is responsible for part of the observed variability in Mn/Ca. Our present results show that the seasonally highly dynamic environmental conditions in the study area lead to a strongly increased Mn/Ca intra-and inter-test variability (average of 45 % RSD). Within single specimens, both increasing and decreasing trends in Mn/Ca ratios with size are observed. Our results suggest that the variability in successive single-chamber Mn/Ca ratios reflects the temporal variability in pore water Mn 2+ . Additionally, active or passive migration of the foraminifera in the surface sediment may explain part of the observed Mn/Ca variability.

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Section: Introductionmentioning

confidence: 99%

Mn∕Ca intra- and inter-test variability in the benthic foraminifer <i>Ammonia tepida</i>

et al. 2018

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“…The metabolic activity of cable bacteria has a strong imprint on the geochemistry of marine sediments (Risgaard-Petersen et al 2012, Rao et al 2016. Concurrent with the development of a cable bacteria communityin thesediment,asuboxiczonedevelops,i.e.azonedevoid of free sulphide and oxygen (Schauer et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Long-distance electron transport by cable bacteria in mangrove sediments

Burdorf¹,

Hidalgo‐Martinez²,

Cook³

et al. 2016

Mar. Ecol. Prog. Ser.

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Cable bacteria are long, filamentous sulphur-oxidizing bacteria that induce long-distance electron transport in aquatic sediments. They turn the seafloor into an electro-active environment, characterized by currents and electrical fields, and when present, they exert a strong impact on the geochemical cycling in the seafloor. However, cable bacteria have only recently been discovered, and so their geographical distribution and habitat distribution remain largely unknown. Here we report field evidence that cable bacteria are present and active in mangrove sediments. Combining microsensor profiling and fluorescence in situ hybridization, we recorded high filament densities (77 m cm −2 ) and the signature of electrogenic sulphur oxidation in sediments of grey mangroves near Melbourne, Australia. Our findings suggest that cable bacteria could be a keystone microbial species in the geochemical cycling of mangroves.

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“…This result probably indicates that PO 4 3À in pore water in such a layer is not from the solid-phase P of ferric iron-bound P (Fe-P) in sediments but instead is from other sources such as P from microbial degradation of OM. In the upper few centimeter of the sediments, degradation of fresh OM has been shown to enhance PO 4 3À efflux (Rao et al, 2016;Kraal et al, 2015).…”

Section: Drp In Pore Water In Different Areasmentioning

confidence: 99%

Dynamic characteristics of sulfur, iron and phosphorus in coastal polluted sediments, north China

Sun

Sheng

Yang

et al. 2016

Environmental Pollution

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a b s t r a c tThe cycling of sulfur (S), iron (Fe) and phosphorus (P) in sediments and pore water can impact the water quality of overlying water. In a heavily polluted river estuary (Yantai, China), vertical profiles of fluxes of dissolved sulfide, Fe 2þ and dissolved reactive phosphorus (DRP) in sediment pore water were investigated by the Diffusive Gradients in Thin films technique (DGT). Vertical fluxes of S, Fe, P in intertidal sediment showed the availability of DRP increased while the sulfide decreased with depth in surface sediment, indicating that sulfide accumulation could enhance P release in anoxic sediment. In sites with contrasting salinity, the relative dominance of iron and sulfate reduction was different, with iron reduction dominant over sulfate reduction in the upper sediment at an intertidal site but the reverse true in a freshwater site, with the other process dominating at depth in each case. Phosphate release was largely controlled by iron reduction.

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The impact of electrogenic sulfide oxidation on elemental cycling and solute fluxes in coastal sediment

Cited by 88 publications

References 65 publications

Mn∕Ca intra- and inter-test variability in the benthic foraminifer <i>Ammonia tepida</i>

Mn∕Ca intra- and inter-test variability in the benthic foraminifer <i>Ammonia tepida</i>

Long-distance electron transport by cable bacteria in mangrove sediments

Dynamic characteristics of sulfur, iron and phosphorus in coastal polluted sediments, north China

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The impact of electrogenic sulfide oxidation on elemental cycling and solute fluxes in coastal sediment

Cited by 88 publications

References 65 publications

Mn∕Ca intra- and inter-test variability in the benthic foraminifer &lt;i&gt;Ammonia tepida&lt;/i&gt;

Mn∕Ca intra- and inter-test variability in the benthic foraminifer &lt;i&gt;Ammonia tepida&lt;/i&gt;

Long-distance electron transport by cable bacteria in mangrove sediments

Dynamic characteristics of sulfur, iron and phosphorus in coastal polluted sediments, north China

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Mn∕Ca intra- and inter-test variability in the benthic foraminifer <i>Ammonia tepida</i>

Mn∕Ca intra- and inter-test variability in the benthic foraminifer <i>Ammonia tepida</i>