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Abundance and Biogeochemical Impact of Cable Bacteria in Baltic Sea Sediments.
Environ Sci Technol. 2019 07 02; 53(13):7494-7503.ES

Abstract

Oxygen depletion in coastal waters may lead to release of toxic sulfide from sediments. Cable bacteria can limit sulfide release by promoting iron oxide formation in sediments. Currently, it is unknown how widespread this phenomenon is. Here, we assess the abundance, activity, and biogeochemical impact of cable bacteria at 12 Baltic Sea sites. Cable bacteria were mostly absent in sediments overlain by anoxic and sulfidic bottom waters, emphasizing their dependence on oxygen or nitrate as electron acceptors. At sites that were temporarily reoxygenated, cable bacterial densities were low. At seasonally hypoxic sites, cable bacterial densities correlated linearly with the supply of sulfide. The highest densities were observed at Gulf of Finland sites with high rates of sulfate reduction. Microelectrode profiles of sulfide, oxygen, and pH indicated low or no in situ cable bacteria activity at all sites. Reactivation occurred within 5 days upon incubation of an intact sediment core from the Gulf of Finland with aerated overlying water. We found no relationship between cable bacterial densities and macrofaunal abundances, salinity, or sediment organic carbon. Our geochemical data suggest that cable bacteria promote conversion of iron monosulfides to iron oxides in the Gulf of Finland in spring, possibly explaining why bottom waters in this highly eutrophic region rarely contain sulfide in summer.

Authors+Show Affiliations

Department of Earth Sciences-Geochemistry, Faculty of Geosciences , Utrecht University , 3508 TC Utrecht , The Netherlands.Department of Earth Sciences-Geochemistry, Faculty of Geosciences , Utrecht University , 3508 TC Utrecht , The Netherlands.Department of Biology , University of Antwerp , 2020 Wilrijk , Belgium.Department of Earth Sciences-Geochemistry, Faculty of Geosciences , Utrecht University , 3508 TC Utrecht , The Netherlands.Department of Estuarine and Delta Systems , NIOZ, Royal Netherlands Institute for Sea Research and Utrecht University , 4400 AC Yerseke , The Netherlands.Department of Biology , University of Antwerp , 2020 Wilrijk , Belgium. Department of Biotechnology , Delft University of Technology , 2628 CN Delft , The Netherlands.Department of Microbiology and Biogeochemistry , NIOZ, Royal Netherlands Institute of Sea Research and Utrecht University , 1790 AB Den Burg , Texel , The Netherlands.Department of Earth Sciences-Geochemistry, Faculty of Geosciences , Utrecht University , 3508 TC Utrecht , The Netherlands.

Pub Type(s)

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

Language

eng

PubMed ID

31149818

Citation

Hermans, Martijn, et al. "Abundance and Biogeochemical Impact of Cable Bacteria in Baltic Sea Sediments." Environmental Science & Technology, vol. 53, no. 13, 2019, pp. 7494-7503.
Hermans M, Lenstra WK, Hidalgo-Martinez S, et al. Abundance and Biogeochemical Impact of Cable Bacteria in Baltic Sea Sediments. Environ Sci Technol. 2019;53(13):7494-7503.
Hermans, M., Lenstra, W. K., Hidalgo-Martinez, S., van Helmond, N. A. G. M., Witbaard, R., Meysman, F. J. R., Gonzalez, S., & Slomp, C. P. (2019). Abundance and Biogeochemical Impact of Cable Bacteria in Baltic Sea Sediments. Environmental Science & Technology, 53(13), 7494-7503. https://doi.org/10.1021/acs.est.9b01665
Hermans M, et al. Abundance and Biogeochemical Impact of Cable Bacteria in Baltic Sea Sediments. Environ Sci Technol. 2019 07 2;53(13):7494-7503. PubMed PMID: 31149818.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Abundance and Biogeochemical Impact of Cable Bacteria in Baltic Sea Sediments. AU - Hermans,Martijn, AU - Lenstra,Wytze K, AU - Hidalgo-Martinez,Silvia, AU - van Helmond,Niels A G M, AU - Witbaard,Rob, AU - Meysman,Filip J R, AU - Gonzalez,Santiago, AU - Slomp,Caroline P, Y1 - 2019/06/14/ PY - 2019/6/1/pubmed PY - 2019/9/19/medline PY - 2019/6/1/entrez SP - 7494 EP - 7503 JF - Environmental science & technology JO - Environ Sci Technol VL - 53 IS - 13 N2 - Oxygen depletion in coastal waters may lead to release of toxic sulfide from sediments. Cable bacteria can limit sulfide release by promoting iron oxide formation in sediments. Currently, it is unknown how widespread this phenomenon is. Here, we assess the abundance, activity, and biogeochemical impact of cable bacteria at 12 Baltic Sea sites. Cable bacteria were mostly absent in sediments overlain by anoxic and sulfidic bottom waters, emphasizing their dependence on oxygen or nitrate as electron acceptors. At sites that were temporarily reoxygenated, cable bacterial densities were low. At seasonally hypoxic sites, cable bacterial densities correlated linearly with the supply of sulfide. The highest densities were observed at Gulf of Finland sites with high rates of sulfate reduction. Microelectrode profiles of sulfide, oxygen, and pH indicated low or no in situ cable bacteria activity at all sites. Reactivation occurred within 5 days upon incubation of an intact sediment core from the Gulf of Finland with aerated overlying water. We found no relationship between cable bacterial densities and macrofaunal abundances, salinity, or sediment organic carbon. Our geochemical data suggest that cable bacteria promote conversion of iron monosulfides to iron oxides in the Gulf of Finland in spring, possibly explaining why bottom waters in this highly eutrophic region rarely contain sulfide in summer. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/31149818/Abundance_and_Biogeochemical_Impact_of_Cable_Bacteria_in_Baltic_Sea_Sediments_ L2 - https://doi.org/10.1021/acs.est.9b01665 DB - PRIME DP - Unbound Medicine ER -