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Coupled dynamics of iron, manganese, and phosphorus in brackish coastal sediments populated by cable bacteria

Coastal waters worldwide suffer from increased eutrophication and seasonal bottom water hypoxia. Here, we assess the dynamics of iron (Fe), manganese (Mn), and phosphorus (P) in sediments of the eutrophic, brackish Gulf of Finland populated by cable bacteria. At sites where bottom waters are oxic in...

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Autores principales: Hermans, Martijn, Astudillo Pascual, Marina, Behrends, Thilo, Lenstra, Wytze K., Conley, Daniel J., Slomp, Caroline P.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley & Sons, Inc. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8360020/
https://www.ncbi.nlm.nih.gov/pubmed/34413543
http://dx.doi.org/10.1002/lno.11776
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author Hermans, Martijn
Astudillo Pascual, Marina
Behrends, Thilo
Lenstra, Wytze K.
Conley, Daniel J.
Slomp, Caroline P.
author_facet Hermans, Martijn
Astudillo Pascual, Marina
Behrends, Thilo
Lenstra, Wytze K.
Conley, Daniel J.
Slomp, Caroline P.
author_sort Hermans, Martijn
collection PubMed
description Coastal waters worldwide suffer from increased eutrophication and seasonal bottom water hypoxia. Here, we assess the dynamics of iron (Fe), manganese (Mn), and phosphorus (P) in sediments of the eutrophic, brackish Gulf of Finland populated by cable bacteria. At sites where bottom waters are oxic in spring, surface enrichments of Fe and Mn oxides and high abundances of cable bacteria were observed in sediments upon sampling in early summer. At one site, Fe and P were enriched in a thin layer (~ 3 mm) just below the sediment–water interface. X‐ray absorption near edge structure and micro X‐ray fluorescence analyses indicate that two‐thirds of the P in this layer was associated with poorly crystalline Fe oxides, with an additional contribution of Mn(II) phosphates. The Fe enriched layer was directly overlain by a Mn oxide‐rich surface layer (~ 2 mm). The Fe oxide layer was likely of diagenetic origin, formed through dissolution of Fe monosulfides and carbonates, potentially induced by cable bacteria in the preceding months when bottom waters were oxic. Most of the Mn oxides were likely deposited from the water column as part of a cycle of repeated deposition and remobilization. Further research is required to confirm whether cable bacteria activity in spring indeed promotes the formation of distinct layers enriched in Fe, Mn, and P minerals in Gulf of Finland sediments. The temporal variations in biogeochemical cycling in this seasonally hypoxic coastal system, potentially controlled by cable bacteria activity, have little impact on permanent sedimentary Fe, Mn, and P burial.
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spelling pubmed-83600202021-08-17 Coupled dynamics of iron, manganese, and phosphorus in brackish coastal sediments populated by cable bacteria Hermans, Martijn Astudillo Pascual, Marina Behrends, Thilo Lenstra, Wytze K. Conley, Daniel J. Slomp, Caroline P. Limnol Oceanogr Articles Coastal waters worldwide suffer from increased eutrophication and seasonal bottom water hypoxia. Here, we assess the dynamics of iron (Fe), manganese (Mn), and phosphorus (P) in sediments of the eutrophic, brackish Gulf of Finland populated by cable bacteria. At sites where bottom waters are oxic in spring, surface enrichments of Fe and Mn oxides and high abundances of cable bacteria were observed in sediments upon sampling in early summer. At one site, Fe and P were enriched in a thin layer (~ 3 mm) just below the sediment–water interface. X‐ray absorption near edge structure and micro X‐ray fluorescence analyses indicate that two‐thirds of the P in this layer was associated with poorly crystalline Fe oxides, with an additional contribution of Mn(II) phosphates. The Fe enriched layer was directly overlain by a Mn oxide‐rich surface layer (~ 2 mm). The Fe oxide layer was likely of diagenetic origin, formed through dissolution of Fe monosulfides and carbonates, potentially induced by cable bacteria in the preceding months when bottom waters were oxic. Most of the Mn oxides were likely deposited from the water column as part of a cycle of repeated deposition and remobilization. Further research is required to confirm whether cable bacteria activity in spring indeed promotes the formation of distinct layers enriched in Fe, Mn, and P minerals in Gulf of Finland sediments. The temporal variations in biogeochemical cycling in this seasonally hypoxic coastal system, potentially controlled by cable bacteria activity, have little impact on permanent sedimentary Fe, Mn, and P burial. John Wiley & Sons, Inc. 2021-05-06 2021-07 /pmc/articles/PMC8360020/ /pubmed/34413543 http://dx.doi.org/10.1002/lno.11776 Text en © 2021 The Authors. Limnology and Oceanography published by Wiley Periodicals LLC on behalf of Association for the Sciences of Limnology and Oceanography. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Articles
Hermans, Martijn
Astudillo Pascual, Marina
Behrends, Thilo
Lenstra, Wytze K.
Conley, Daniel J.
Slomp, Caroline P.
Coupled dynamics of iron, manganese, and phosphorus in brackish coastal sediments populated by cable bacteria
title Coupled dynamics of iron, manganese, and phosphorus in brackish coastal sediments populated by cable bacteria
title_full Coupled dynamics of iron, manganese, and phosphorus in brackish coastal sediments populated by cable bacteria
title_fullStr Coupled dynamics of iron, manganese, and phosphorus in brackish coastal sediments populated by cable bacteria
title_full_unstemmed Coupled dynamics of iron, manganese, and phosphorus in brackish coastal sediments populated by cable bacteria
title_short Coupled dynamics of iron, manganese, and phosphorus in brackish coastal sediments populated by cable bacteria
title_sort coupled dynamics of iron, manganese, and phosphorus in brackish coastal sediments populated by cable bacteria
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8360020/
https://www.ncbi.nlm.nih.gov/pubmed/34413543
http://dx.doi.org/10.1002/lno.11776
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