iron manganese bioturbation

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  Changes in Bioturbation of Iron Biogeochemistry and in …

  2010316 · This condition affected iron biogeochemistry throughout time by imposing a downward migration of the oxic/anoxic boundary and finally reducing dissolved iron availability (Fig. 1 b–e). High infection levels by P. olseni affected clam bioturbation potential to influence iron biogeochemistry.

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  Oxidation of pyrite and iron sulfide by manganese dioxide in …

  2001315 · In slurry experiments with 55 FeS 2 and a MnO 2 rich marine sediment an oxidation of 55 FeS 2 was detected which decreased with depth and decreasing concentration of MnO 2 in the sediment. FeS 2 and iron sulfide (FeS) were oxidized chemically at pH 8 by MnO 2 but not by nitrate or amorphic Fe (III) oxide. Elemental sulfur …

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  Bioturbation and manganese cycling in hemipelagic sediments

  1990619 · The activities of infaunal macrobenthos have major influences on the types, rates and distributions of diagenetic reactions involving manganese in relatively carbon-rich deep-sea and nearshore sediments. In some non-sulphidic hemipelagic deposits of the eastern equatorial Pacific (Panama Basin) biogenic reworking drives internal cycles of …

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  Burrow dynamics of crabs in subtropical estuarine mangrove forest

  202155 · Sesarmid crabs also play an important role in the C dynamics of mangrove forests. Bioturbation by burrowing crabs can also affect nutrient cycling in mangroves. Mechanical fragmentation of mangrove leaves by sesarmid feeding breaks leaves down into smaller particles with greater surface areas that can be colonized by microbes (Lee, 1997, …

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  Arsenic Environmental Threshold Surpass in Estuarine …

  2017113 · Abstract We investigate the distributions of the metalloid arsenic (As) and metals iron (Fe) and manganese (Mn) in the sediments of two pristine areas of a biological reserve in the Patos Lagoon Estuary. This area is occupied by Spartina alterniflora and by Neohelice granulata crab colonies and low concentrations of As are expected.

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  Patterns of Bioturbation and Associated Matter Fluxes

  202321 · Bioturbation supports, for instance, C turnover (mineralization) since mixing replenishes iron and manganese oxides fueling continuous steady state microbial anaerobic processes in the sediment.

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  Remobilisation of uranium from contaminated …

  2020725 · To sep-arate the effects of bioturbation and U contamination, the variations of other parameters (iron, sulfates, ni-trates and nitrites) were analysed by two-way ANOVAs (“Tubifex” / “uranium”) completed by post hoc Bonfer-roni tests.

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  In situ, high resolution ZrO-Chelex DGT for the investigation of iron ...

  2016420 · Request PDF | In situ, high resolution ZrO-Chelex DGT for the investigation of iron-coupled inactivation of arsenic in sediments by macrozoobenthos bioturbation and hydrodynamic interactions | The ...

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  Bioturbation and manganese cycling in hemipelagic sediments

  1990619 · The activities of infaunal macrobenthos have major influences on the types, rates and distributions of diagenetic reactions involving manganese in relatively carbon-rich deep-sea and nearshore sediments. In some non-sulphidic hemipelagic deposits of the eastern equatorial Pacific (Panama Basin) biogenic reworking drives internal cycles of …

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  Sebastiaan van de Velde 1,# Filip J. R. Meysman 2,1

  17 16 Submitted to: Aquatic Geochemistry – special issue 18 Keywords: reactive transport modelling; diagenetic cycling; iron; sulphur; bioturbation; bio- 19 mixing; bio-irrigation

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