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Cable bacteria generate a firewall against euxinia in seasonally hypoxic basins.
Proc Natl Acad Sci U S A. 2015 Oct 27; 112(43):13278-83.PN

Abstract

Seasonal oxygen depletion (hypoxia) in coastal bottom waters can lead to the release and persistence of free sulfide (euxinia), which is highly detrimental to marine life. Although coastal hypoxia is relatively common, reports of euxinia are less frequent, which suggests that certain environmental controls can delay the onset of euxinia. However, these controls and their prevalence are poorly understood. Here we present field observations from a seasonally hypoxic marine basin (Grevelingen, The Netherlands), which suggest that the activity of cable bacteria, a recently discovered group of sulfur-oxidizing microorganisms inducing long-distance electron transport, can delay the onset of euxinia in coastal waters. Our results reveal a remarkable seasonal succession of sulfur cycling pathways, which was observed over multiple years. Cable bacteria dominate the sediment geochemistry in winter, whereas, after the summer hypoxia, Beggiatoaceae mats colonize the sediment. The specific electrogenic metabolism of cable bacteria generates a large buffer of sedimentary iron oxides before the onset of summer hypoxia, which captures free sulfide in the surface sediment, thus likely preventing the development of bottom water euxinia. As cable bacteria are present in many seasonally hypoxic systems, this euxinia-preventing firewall mechanism could be widely active, and may explain why euxinia is relatively infrequently observed in the coastal ocean.

Authors+Show Affiliations

Department of Ecosystem Studies, Royal Netherlands Institute for Sea Research, 4401 NT Yerseke, The Netherlands; dorina.seitaj@nioz.nl filip.meysman@nioz.nl.Center for Microbiology, Department of Bioscience, Aarhus University, 8000 Aarhus, Denmark;Department of Earth Sciences-Geochemistry, Faculty of Geosciences, Utrecht University, 3584 CD Utrecht, The Netherlands;Department of Ecosystem Studies, Royal Netherlands Institute for Sea Research, 4401 NT Yerseke, The Netherlands;Department of Analytical, Environmental, and Geochemistry, Vrije Universiteit Brussel, 1050 Brussels, Belgium.Department of Ecosystem Studies, Royal Netherlands Institute for Sea Research, 4401 NT Yerseke, The Netherlands;Department of Earth Sciences-Geochemistry, Faculty of Geosciences, Utrecht University, 3584 CD Utrecht, The Netherlands;Department of Ecosystem Studies, Royal Netherlands Institute for Sea Research, 4401 NT Yerseke, The Netherlands; Department of Analytical, Environmental, and Geochemistry, Vrije Universiteit Brussel, 1050 Brussels, Belgium dorina.seitaj@nioz.nl filip.meysman@nioz.nl.

Pub Type(s)

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

Language

eng

PubMed ID

26446670

Citation

Seitaj, Dorina, et al. "Cable Bacteria Generate a Firewall Against Euxinia in Seasonally Hypoxic Basins." Proceedings of the National Academy of Sciences of the United States of America, vol. 112, no. 43, 2015, pp. 13278-83.
Seitaj D, Schauer R, Sulu-Gambari F, et al. Cable bacteria generate a firewall against euxinia in seasonally hypoxic basins. Proc Natl Acad Sci U S A. 2015;112(43):13278-83.
Seitaj, D., Schauer, R., Sulu-Gambari, F., Hidalgo-Martinez, S., Malkin, S. Y., Burdorf, L. D., Slomp, C. P., & Meysman, F. J. (2015). Cable bacteria generate a firewall against euxinia in seasonally hypoxic basins. Proceedings of the National Academy of Sciences of the United States of America, 112(43), 13278-83. https://doi.org/10.1073/pnas.1510152112
Seitaj D, et al. Cable Bacteria Generate a Firewall Against Euxinia in Seasonally Hypoxic Basins. Proc Natl Acad Sci U S A. 2015 Oct 27;112(43):13278-83. PubMed PMID: 26446670.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Cable bacteria generate a firewall against euxinia in seasonally hypoxic basins. AU - Seitaj,Dorina, AU - Schauer,Regina, AU - Sulu-Gambari,Fatimah, AU - Hidalgo-Martinez,Silvia, AU - Malkin,Sairah Y, AU - Burdorf,Laurine D W, AU - Slomp,Caroline P, AU - Meysman,Filip J R, Y1 - 2015/10/07/ PY - 2015/10/9/entrez PY - 2015/10/9/pubmed PY - 2016/2/18/medline KW - cable bacteria KW - coastal hypoxia KW - microbial competition KW - sediment biogeochemistry KW - sulfur cycling SP - 13278 EP - 83 JF - Proceedings of the National Academy of Sciences of the United States of America JO - Proc Natl Acad Sci U S A VL - 112 IS - 43 N2 - Seasonal oxygen depletion (hypoxia) in coastal bottom waters can lead to the release and persistence of free sulfide (euxinia), which is highly detrimental to marine life. Although coastal hypoxia is relatively common, reports of euxinia are less frequent, which suggests that certain environmental controls can delay the onset of euxinia. However, these controls and their prevalence are poorly understood. Here we present field observations from a seasonally hypoxic marine basin (Grevelingen, The Netherlands), which suggest that the activity of cable bacteria, a recently discovered group of sulfur-oxidizing microorganisms inducing long-distance electron transport, can delay the onset of euxinia in coastal waters. Our results reveal a remarkable seasonal succession of sulfur cycling pathways, which was observed over multiple years. Cable bacteria dominate the sediment geochemistry in winter, whereas, after the summer hypoxia, Beggiatoaceae mats colonize the sediment. The specific electrogenic metabolism of cable bacteria generates a large buffer of sedimentary iron oxides before the onset of summer hypoxia, which captures free sulfide in the surface sediment, thus likely preventing the development of bottom water euxinia. As cable bacteria are present in many seasonally hypoxic systems, this euxinia-preventing firewall mechanism could be widely active, and may explain why euxinia is relatively infrequently observed in the coastal ocean. SN - 1091-6490 UR - https://www.unboundmedicine.com/medline/citation/26446670/Cable_bacteria_generate_a_firewall_against_euxinia_in_seasonally_hypoxic_basins_ L2 - http://www.pnas.org/cgi/pmidlookup?view=long&pmid=26446670 DB - PRIME DP - Unbound Medicine ER -