Onderzoeksoutput

Welkom op het expertplatform!

Dit platform verschaft informatie en kennis omtrent de WL expertisedomeinen 'hydraulica en sediment', 'havens en waterwegen', 'waterbouwkundige constructies', 'waterbeheer' en 'kustbescherming' - gaande van WL medewerkers met hun expertise, het curriculum van deze instelling, tot publicaties, projecten, data (op termijn) en evenementen waarin het WL betrokken is.

Het WL onderschrijft het belang van "open access" voor de ontsluiting van haar onderzoeksresultaten. Lees er meer over in ons openaccessbeleid.

log in

• 
  People
• 
  Curriculum
• 
  Projects
• 
  Data sets
• 
  Publications
• 
  Events

[ meld een fout in dit record ]

mandje (1): toevoegen | toon

---

one publication added to basket [281481]

The impact of electrogenic sulfur oxidation on the biogeochemistry of coastal sediments: a field study van de Velde, S.; Lesven, L.; Burdorf, L.D.W.; Hidalgo-Martinez, S.; Geelhoed, J.S.; van Rijswijk, P.; Gao, Y.; Meysman, F.J.R. (2016). The impact of electrogenic sulfur oxidation on the biogeochemistry of coastal sediments: a field study. Geochim. Cosmochim. Acta 194: 211-232. https://dx.doi.org/10.1016/j.gca.2016.08.038 In: Geochimica et Cosmochimica Acta. Elsevier: Oxford,New York etc.. ISSN 0016-7037; e-ISSN 1872-9533 Is gerelateerd aan: Van de Velde, S. (2018). The impact of electrogenic sulphur oxidation on the biogeochemistry of coastal sediments: a field study, in: Van de Velde, S. Electron shuttling and elemental cycling in the seafloor. pp. 23-64, meer

---

Beschikbaar in	Auteurs
VLIZ: Non-open access 299106 [ aanvragen ]

---

Trefwoorden

Bacteria [WoRMS] Marien/Kust

Author keywords

Electrogenic sulfur oxidation; Marine sediments; Long-distance electron transport; Redox cycling; Cable bacteria

---

Auteurs		Top
van de Velde, S. Lesven, L. Burdorf, L.D.W. Hidalgo-Martinez, S.	Geelhoed, J.S. van Rijswijk, P. Gao, Y. Meysman, F.J.R.

---

Abstract

Electro-active sediments distinguish themselves from other sedimentary environments by the presence of microbially induced electrical currents in the surface layer of the sediment. The electron transport is generated by metabolic activity of long filamentous cable bacteria, in a process referred to as electrogenic sulfur oxidation (e-SOx). Laboratory experiments have shown that e-SOx exerts a large impact on the sediment geochemistry, but its influence on the in situ geochemistry of marine sediments has not been previously investigated. Here, we document the biogeochemical cycling associated with e-SOx in a cohesive coastal sediment in the North Sea (Station 130, Belgian Coastal Zone) during three campaigns (January, March and May 2014). Fluorescence in situ hybridization showed that cable bacteria were present in high densities throughout the sampling period, and that filaments penetrated up to 7 cm deep in the sediment, which is substantially deeper than previously recorded. High resolution microsensor profiling (pH, H2S and O2) revealed the typical geochemical fingerprint of e-SOx, with a wide separation (up to 4.8 cm) between the depth of oxygen penetration and the depth of sulfide appearance. The metabolic activity of cable bacteria induced a current density of 25–32 mA m−2 and created an electrical field of 12–17 mV m−1 in the upper centimeters of the sediment. This electrical field created an ionic drift, which strongly affected the depth profiles and fluxes of major cations (Ca2+, Fe2+) and anions (SO42−) in the pore water. The strong acidification of the pore water at depth resulted in the dissolution of calcium carbonates and iron sulfides, thus leading to a strong accumulation of iron, calcium and manganese in the pore water. While sulfate accumulated in the upper centimeters, no significant effect of e-SOx was found on ammonium, phosphate and silicate depth profiles. Overall, our results demonstrate that cable bacteria can strongly modulate the sedimentary biogeochemical cycling under in situ conditions.

---

Alle informatie in het Integrated Marine Information System (IMIS) valt onder het VLIZ Privacy beleid

Top | Auteurs

IMIS is ontwikkeld en wordt gehost door het VLIZ.