Aquatic Geochemistry

, Volume 22, Issue 5–6, pp 469–504 | Cite as

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

  • Sebastiaan van de VeldeEmail author
  • Filip J. R. Meysman
Original Article


The geochemical cycles of iron and sulphur in marine sediments are strongly intertwined and give rise to a complex network of redox and precipitation reactions. Bioturbation refers to all modes of transport of particles and solutes induced by larger organisms, and in the present-day seafloor, bioturbation is one of the most important factors controlling the biogeochemical cycling of iron and sulphur. To better understand how bioturbation controls Fe and S cycling, we developed reactive transport model of a coastal sediment impacted by faunal activity. Subsequently, we performed a model sensitivity analysis, separately investigating the two different transport modes of bioturbation, i.e. bio-mixing (solid particle transport) and bio-irrigation (enhanced solute transport). This analysis reveals that bio-mixing and bio-irrigation have distinct—and largely opposing effects on both the iron and sulphur cycles. Bio-mixing enhances transport between the oxic and suboxic zones, thus promoting the reduction of oxidised species (e.g. iron oxyhydroxides) and the oxidation of reduced species (e.g. iron sulphides). Through the re-oxidation of iron sulphides, bio-mixing strongly enhances the recycling of Fe and S between their reduced and oxidised states. Bio-irrigation on the other hand removes reduced solutes, i.e. ferrous iron and free sulphide, from the sediment pore water. These reduced species are then reoxidised in the overlying water and not recycled within the sediment column, which leads to a decrease in Fe and S recycling. Overall, our results demonstrate that the ecology of the macrofauna (inducing bio-mixing or bio-irrigation, or both) matters when assessing their impact on sediment geochemistry. This finding seems particularly relevant for sedimentary cycling across Cambrian transition, when benthic fauna started colonizing and reworking the seafloor.


Reactive transport modelling Diagenetic cycling Iron Sulphur Bioturbation Bio-mixing Bio-irrigation 



The research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP/2007–2013) through ERC Grant 306933 (FJRM) and was financially supported by Research Foundation Flanders (FWO Aspirant Ph.D. Fellowship to SVDV).

Supplementary material

10498_2016_9301_MOESM1_ESM.docx (209 kb)
Supplementary material 1 (DOCX 209 kb)
10498_2016_9301_MOESM2_ESM.docx (105 kb)
Supplementary material 2 (DOCX 105 kb)


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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • Sebastiaan van de Velde
    • 1
    Email author
  • Filip J. R. Meysman
    • 1
    • 2
  1. 1.Department of Analytical, Environmental and Geo-ChemistryVrije Universiteit Brussel (VUB)BrusselsBelgium
  2. 2.Department of Ecosystem StudiesThe Royal Netherlands Institute of Sea Research (NIOZ)YersekeThe Netherlands

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