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

Content Provider	Springer Nature Link
Author	van de Velde, Sebastiaan Meysman, Filip J. R.
Copyright Year	2016
Abstract	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.
Starting Page	469
Ending Page	504
Page Count	36
File Format	PDF
ISSN	13806165
Journal	Aquatic Geochemistry
Volume Number	22
Issue Number	5-6
e-ISSN	15731421
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-09-10
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Reactive transport modelling Diagenetic cycling Iron Sulphur Bioturbation Bio-mixing Bio-irrigation Geochemistry Hydrology/Water Resources Hydrogeology Water Quality/Water Pollution
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Using a Thermal Proxy to Examine Sediment–Water Exchange in Mid-Continental Shelf Sandy Sediments

CO2 Outgassing from Spring Waters

Geomicrobiology of Iron Layers in the Sediment of Lake Superior

The Application of Raman Spectroscopy to Probe the Association of H4SiO4 with Iron Oxides

Recycling of Organic Matter in the Sediments of Santa Monica Basin, California Borderland

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

Biogeochemistry of Ethanol and Acetaldehyde in Freshwater Sediments

The Speciation of Metals in Natural Waters

Modelling Estuarine Biogeochemical Dynamics: From the Local to the Global Scale

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

Similar Documents

Using a Thermal Proxy to Examine Sediment–Water Exchange in Mid-Continental Shelf Sandy Sediments

CO2 Outgassing from Spring Waters

Geomicrobiology of Iron Layers in the Sediment of Lake Superior

The Application of Raman Spectroscopy to Probe the Association of H4SiO4 with Iron Oxides

Recycling of Organic Matter in the Sediments of Santa Monica Basin, California Borderland

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

Biogeochemistry of Ethanol and Acetaldehyde in Freshwater Sediments

The Speciation of Metals in Natural Waters

Modelling Estuarine Biogeochemical Dynamics: From the Local to the Global Scale

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