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  • Regional patterns of bioturbation and iron and

    Cited by: 7
  • Bioturbation effects on metal release from

    Cited by: 2
  • Bacterial Manganese and Iron Reduction in Aquatic ...

    Cited by: 584
  • Bioturbation - an overview ScienceDirect Topics

    Bioturbation. Bioturbation is the biogenic transport of sediment particles and pore water which destroys sediment stratigraphy, alters chemical profiles, changes rates of chemical reactions and sediment-water exchange, and modifies sediment physical properties such as grain size, porosity, and permeability. ... Iron–manganese microscopic ...

  • (PDF) Effects of re-oxygenation and bioturbation by

    Effects of re-oxygenation and bioturbation by the polychaete Marenzelleria arctia on phosphorus, iron and manganese dynamics in Baltic Sea sediments

  • (PDF) Bacterial Manganese and Iron Reduction in

    作者: Bo Thamdrup
  • Regional patterns of bioturbation and iron and

    Cited by: 7
  • Manganese, iron and sulfur cycling in a coastal marine ...

    Cited by: 603
  • Regional patterns of bioturbation and iron and

    Request PDF On Oct 1, 2013, Margaret E.S. Esch and others published Regional patterns of bioturbation and iron and manganese reduction in the sediments of the southeastern Bering Sea Find ...

  • (PDF) Reactive iron in marine sediments - ResearchGate

    作者: Donald Canfield
  • Cycling of iron and manganese in freshwater, estuarine

    Cycling of iron and manganese in freshwater, estuarine and deep sea sediments PROEFSCHRIFT ter verkrijging van het doctoraat in de Wiskunde en Natuurwetenschappen aan de Rijksuniversiteit Groningen op gezag van de Rector Magnificus, dr. F. Zwarts, in het openbaar te verdedigen op vrijdag 27 juni 2003 om 14.15 uur door Imola Ferro geboren op 23 ...

  • The origin of terrestrial pisoliths and pisolitic iron ore ...

    Typically composed of iron, aluminium and manganese sesquioxides with minor admixtures of quartz and kaolinite, they are widely distributed in tropical to subtropical regions overlying deeply weathered soil profiles. ... leaves and pollen in pisolites is explained by bioturbation and the action of soil organisms during extended pedogenesis ...

  • Carbon, manganese, iron, and sulfur cycling in oligohaline ...

    2017-4-28  concentrations. Contributions from dissimilatory manganese and iron reduction are limited by the near absence of bioturbation, and the reactivity of iron oxides in the sulfate reduction zone appears too low to support substantial oxidation of either sulfide or methane, while anaerobic

  • University of Groningen Cycling of iron and manganese in ...

    2016-3-5  For iron- and manganese oxides, both solid-phase electron acceptors, sediment characteristics such as organic carbon concentration, pool size and the degree of sediment disturbance (e.g. bioturbation by benthic fauna) are important factors

  • Biological rejuvenation of iron oxides in bioturbated ...

    The biogeochemical cycle of iron is intricately linked to numerous element cycles. Although biological processes that catalyze the reductive side of the iron cycle are established, little is known ...

  • Bioturbation and Manganese Cycling in ... - NASA/ADS

    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 manganese, which can apparently account for up to ca ...

  • Investigation of heavy metals release from sediment

    2020-5-18  He Y(1), Men B(2), Yang X(1), Li Y(1), Xu H(1), Wang D(3). Author information: (1)State Key Laboratory of Environmental Aquatic Chemistry, Research Centre for Eco-Environmental Science, Chinese Academy of Sciences, Beijing 100085, China. (2)State Key

  • Bioturbation/bioirrigation effect on thallium released from ...

    2016-12-8  Bioturbation effects on heavy metals fluxes from sediment tr... Distributions of polychlorinated biphenyls in the Daliao Riv... Interfacial mechanisms of heterogeneous Fenton reactions cat... EDTA enhanced heterogeneous Fenton oxidation of dimethyl pht...

  • Three manganese oxide-rich marine ... - The ISME

    Energetically, manganese oxide is a much more favorable electron acceptor than iron oxide or sulfate. Accordingly, manganese-reducing microorganisms are expected to outcompete iron and sulfate ...

  • Effects of re-oxygenation and bioturbation by the ...

    Effects of re-oxygenation and bioturbation by the polychaete Marenzelleria arctia on phosphorus, iron and manganese dynamics in Baltic Sea sediments By Åsa Danielsson, Lars Rahm, Volker Brüchert, Stefano Bonaglia, Caroline Raymond, Ola Svensson, Sepehr Shakeri

  • PARTICLE MIXING IRRIGATION IRON MANGANESE

    – The impact of bioturbation on iron and manganese cycling in ma-rine sediments was studied in laboratory experiments in which faunal effects which combine in the field (particle mixing and oxygen exchange) were studied separate-ly. Particle mixing and sediment aeration both enhance metal oxide reduction rates as reflected in pore-water and ...

  • The flux of iron from continental shelf sediments: A ...

    The flux of iron (Fe; A) and inorganic carbon (C ox) derived from the oxidation of organic matter (B) [Berelson et al. , 1996, 2003] versus bottom depth for all stations.The relationship between the fluxes of Fe and C ox is shown in (C). Triangles are Monterey Bay, circles are central California (CC) transect, and squares are southern California (SC) basins.

  • Arsenic Environmental Threshold Surpass in Estuarine ...

    Arsenic Environmental Threshold Surpass in Estuarine Sediments: Effects of Bioturbation. Costa L(1), Mirlean N(2), Garcia F(2). ... (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 ...

  • EFFECT OF MACROFAUNA, OXYGEN EXCHANGE AND

    role in diagenesis and iron is likely to be affected by bioturbation in a similar way as manganese. The effect of bioturbation on iron-oxide reduction has not yet been investigated in detail. Glud et aí. (2000) concluded that the high iron- oxide reduction rates they measured in a high-arc­ tic sound needed intense bioturbation, but the de­

  • Relation of Reactive Sulfides with Organic Carbon,

    The accumulation of acid-volatile sulfides and its relation with other trace metal-binding sediment constituents may be important mechanisms to determine the suitability of anaerobic sediments to trap trace metals. An investigation into the relationships among acid-volatile sulfides, total organic carbon, and reactive (hydrogen chloride–soluble) iron, manganese, and trace metals of ...

  • Relation of Reactive Sulfides with Organic Carbon,

    2019-9-22  An investigation into the relationships among acid-volatile sulfides, total organic carbon, and reactive (hydrogen chloride–soluble) iron, manganese, and trace metals of environmental concern (cadmium, copper, nickel, lead, and zinc) was conduced in anaerobic sediments from a disturbed mangrove ecosystem in Sepetiba Bay (SE Brazil).

  • Effect of Short-Term Resuspension Events on Trace

    2019-5-25  The effects of the short-term resuspension of a contaminated anoxic estuarine sediment on solid-phase metal speciation have been studied. Preliminary experiments investigated the oxidation rates of model metal sulfide phases to provide mechanistic information for interpreting the observations on the natural sediment. FeS and MnS model phases were particularly labile and oxidized rapidly in ...

  • Seagrass-Mediated Phosphorus and Iron

    2019-5-26  Tropical seagrasses are nutrient-limited owing to the strong phosphorus fixation capacity of carbonate-rich sediments, yet they form densely vegetated, multispecies meadows in oligotrophic tropical waters. Using a novel combination of high-resolution, two-onal chemical imaging of O2, pH, iron, sulfide, calcium, and phosphorus, we found that tropical seagrasses are able to mobilize the ...

  • Effects of re-oxygenation and bioturbation by the ... -

    Effects of re-oxygenation and bioturbation by the polychaete Marenzelleria arctia on phosphorus, iron and manganese dynamics in Baltic Sea sediments Danielsson, Åsa Linköping University, Department of Thematic Studies, Tema Environmental Change.

  • Effects of re-oxygenation and bioturbation by the ... -

    Effects of re-oxygenation and bioturbation by the polychaete Marenzelleria arctia on phosphorus, iron and manganese dynamics in Baltic Sea sediments Danielsson, Åsa Linköping University, Department of Thematic Studies, Tema Environmental Change.

  • Manganese, iron and sulfur cycling in a coastal marine ...

    The seasonal variation in oxidized and reduced pools of Mn, Fe and S, as well as the rates of SO 4 2- reduction, were studied in a fine-grained sediment. Below the 1-5 mm thick oxic zone, a zone of net Mn reduction extended to 1-2 cm depth, while iron reduction was found to 4-6 cm depth. Although the reactive Mn oxide pool was ten times smaller than the reactive Fe(III) pool, the average ratio ...

  • Mollusks from the late Campanian upper DeGrey

    Manganese-iron carbonate–bearing strata of the upper Campanian upper DeGrey Formation of the Pierre Shale contain molds, casts, and fragments of marine invertebrates and vertebrates. Mollusks, collected from 24 localities along the Missouri River Valley in central South Dakota, occur as molds and casts of black manganese-iron composition with ...

  • Sulphate reduction and sulphur cycling in lake

    In anoxic sediments both biotic and abiotic processes are involved in reoxidation. Electron acceptors, such as nitrate and oxidized iron and manganese compounds are quantitatively the most important . Chemical sulphide oxidation, where S° is the main product is mediated by iron (Fe) and manganese (Mn) oxides and hydroxides (17; 40; 137; 68 ...

  • Estimate of Manganese and Iron Oxide Reduction

    In order to determine organic carbon oxidation by manganese and iron oxides, six core sediments were obtained in slope and basin sediments of Ulleung Basin in East Sea. The basin sediments show high organic carbon contents (>2%) at the water depths deeper than 2,000 m; this is rare for deep-sea sediments, except for those of the Black Sea and ...

  • Impact of Aeolian Dry Deposition of Reactive Iron

    The Gulf of Aqaba is an oligotrophic marine system with oxygen-rich water column and organic carbon-poor sediments (≤0.6% at sites that are not influenced by anthropogenic impact). Aeolian dust deposition from the Arabian, Sinai, and Sahara Deserts is an important source of sediment, especially at the deep-water sites of the Gulf, which are less affected by sediment transport from the Arava ...

  • Development of a sediment redox ... - Princeton

    A numerical model was developed to simulate the vertical profile of the redox potential in benthic sediments. The benthic sediments were subdivided vertically into six zones, each with different microbial and chemical reactions: aerobic respiration, denitrification, manganese reduction, iron reduction, sulfate reduction, and methanogenesis.

  • The anaerobic degradation of organic matter in

    2020-5-26  The authors used a combination of porewater and solid phase analysis, as well as a series of sediment incubations, to quantify organic carbon oxidation by dissimilatory Fe reduction, Mn reduction, and sulfate reduction, in sediments from the Skagerrak (located off the northeast coast of Jutland ...

  • Production and preservation of organic matter: The ...

    Production and preservation of organic matter: The significance of iron Stephen R. Meyers1 Received 8 June 2006; revised 25 May 2007; accepted 14 June 2007; published 22 November 2007. [1] ‘‘Iron fertilization’’ has been previously recognized as a potential mechanism for enhanced organic matter burial in marine sediments.

  • Early diagenesis of Manganese, Iron and Phosphorus

    Geologica Ultraiectina, 215. Early diagenesis of Manganese, Iron and Phosphorus in European continental margin sediments

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