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Cable Bacteria Control Iron-Phosphorus Dynamics in Sediments of a Coastal Hypoxic Basin.
Environ Sci Technol. 2016 Feb 02; 50(3):1227-33.ES

Abstract

Phosphorus is an essential nutrient for life. The release of phosphorus from sediments is critical in sustaining phytoplankton growth in many aquatic systems and is pivotal to eutrophication and the development of bottom water hypoxia. Conventionally, sediment phosphorus release is thought to be controlled by changes in iron oxide reduction driven by variations in external environmental factors, such as organic matter input and bottom water oxygen. Here, we show that internal shifts in microbial communities, and specifically the population dynamics of cable bacteria, can also induce strong seasonality in sedimentary iron-phosphorus dynamics. Field observations in a seasonally hypoxic coastal basin demonstrate that the long-range electrogenic metabolism of cable bacteria leads to a dissolution of iron sulfides in winter and spring. Subsequent oxidation of the mobilized ferrous iron with manganese oxides results in a large stock of iron-oxide-bound phosphorus below the oxic zone. In summer, when bottom water hypoxia develops and cable bacteria are undetectable, the phosphorus associated with these iron oxides is released, strongly increasing phosphorus availability in the water column. Future research should elucidate whether formation of iron-oxide-bound phosphorus driven by cable bacteria, as observed in this study, contributes to the seasonality in iron-phosphorus cycling in aquatic sediments worldwide.

Authors+Show Affiliations

Department of Earth Sciences, Geochemistry, Faculty of Geosciences, Utrecht University , Utrecht, The Netherlands.Department of Ecosystem Studies, Royal Netherlands Institute for Sea Research , Yerseke, The Netherlands.Department of Ecosystem Studies, Royal Netherlands Institute for Sea Research , Yerseke, The Netherlands.Center for Geomicrobiology and Section for Microbiology, Department of Bioscience, Aarhus University , Aarhus, Denmark.Department of Earth Sciences, Geochemistry, Faculty of Geosciences, Utrecht University , Utrecht, The Netherlands.Department of Earth Sciences, Geochemistry, Faculty of Geosciences, Utrecht University , Utrecht, The Netherlands.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26720721

Citation

Sulu-Gambari, Fatimah, et al. "Cable Bacteria Control Iron-Phosphorus Dynamics in Sediments of a Coastal Hypoxic Basin." Environmental Science & Technology, vol. 50, no. 3, 2016, pp. 1227-33.
Sulu-Gambari F, Seitaj D, Meysman FJ, et al. Cable Bacteria Control Iron-Phosphorus Dynamics in Sediments of a Coastal Hypoxic Basin. Environ Sci Technol. 2016;50(3):1227-33.
Sulu-Gambari, F., Seitaj, D., Meysman, F. J., Schauer, R., Polerecky, L., & Slomp, C. P. (2016). Cable Bacteria Control Iron-Phosphorus Dynamics in Sediments of a Coastal Hypoxic Basin. Environmental Science & Technology, 50(3), 1227-33. https://doi.org/10.1021/acs.est.5b04369
Sulu-Gambari F, et al. Cable Bacteria Control Iron-Phosphorus Dynamics in Sediments of a Coastal Hypoxic Basin. Environ Sci Technol. 2016 Feb 2;50(3):1227-33. PubMed PMID: 26720721.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Cable Bacteria Control Iron-Phosphorus Dynamics in Sediments of a Coastal Hypoxic Basin. AU - Sulu-Gambari,Fatimah, AU - Seitaj,Dorina, AU - Meysman,Filip J R, AU - Schauer,Regina, AU - Polerecky,Lubos, AU - Slomp,Caroline P, Y1 - 2016/01/14/ PY - 2016/1/1/entrez PY - 2016/1/1/pubmed PY - 2016/9/28/medline SP - 1227 EP - 33 JF - Environmental science & technology JO - Environ Sci Technol VL - 50 IS - 3 N2 - Phosphorus is an essential nutrient for life. The release of phosphorus from sediments is critical in sustaining phytoplankton growth in many aquatic systems and is pivotal to eutrophication and the development of bottom water hypoxia. Conventionally, sediment phosphorus release is thought to be controlled by changes in iron oxide reduction driven by variations in external environmental factors, such as organic matter input and bottom water oxygen. Here, we show that internal shifts in microbial communities, and specifically the population dynamics of cable bacteria, can also induce strong seasonality in sedimentary iron-phosphorus dynamics. Field observations in a seasonally hypoxic coastal basin demonstrate that the long-range electrogenic metabolism of cable bacteria leads to a dissolution of iron sulfides in winter and spring. Subsequent oxidation of the mobilized ferrous iron with manganese oxides results in a large stock of iron-oxide-bound phosphorus below the oxic zone. In summer, when bottom water hypoxia develops and cable bacteria are undetectable, the phosphorus associated with these iron oxides is released, strongly increasing phosphorus availability in the water column. Future research should elucidate whether formation of iron-oxide-bound phosphorus driven by cable bacteria, as observed in this study, contributes to the seasonality in iron-phosphorus cycling in aquatic sediments worldwide. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/26720721/Cable_Bacteria_Control_Iron_Phosphorus_Dynamics_in_Sediments_of_a_Coastal_Hypoxic_Basin_ L2 - https://doi.org/10.1021/acs.est.5b04369 DB - PRIME DP - Unbound Medicine ER -