Oxygen minimum zone cryptic sulfur cycling sustained by offshore transport of key sulfur oxidizing bacteria.

Callbeck, Cameron M., Lavik, Gaute, Ferdelman, Timothy G., Fuchs, Bernhard, Gruber-Vodicka, Harald R., Hach, Philipp F., Littmann, Sten, Schoffelen, Niels J., Kalvelage, Tim, Thomsen, Sören , Schunck, Harald, Löscher, Carolin, Schmitz, Ruth A. and Kuypers, Marcel M. M. (2018) Oxygen minimum zone cryptic sulfur cycling sustained by offshore transport of key sulfur oxidizing bacteria. Open Access Nature Communications, 9 (1729). DOI 10.1038/s41467-018-04041-x.

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Abstract

Members of the gammaproteobacterial clade SUP05 couple water column sulfide oxidation to nitrate reduction in sulfidic oxygen minimum zones (OMZs). Their abundance in offshore OMZ waters devoid of detectable sulfide has led to the suggestion that local sulfate reduction fuels SUP05-mediated sulfide oxidation in a so-called “cryptic sulfur cycle”. We examined the distribution and metabolic capacity of SUP05 in Peru Upwelling waters, using a combination of oceanographic, molecular, biogeochemical and single-cell techniques. A single SUP05 species, UThioglobus perditus, was found to be abundant and active in both sulfidic shelf and sulfide-free offshore OMZ waters. Our combined data indicated that mesoscale eddy-driven transport led to the dispersal of UT. perditus and elemental sulfur from the sulfidic shelf waters into the offshore OMZ region. This offshore transport of shelf waters provides an alternative explanation for the abundance and activity of sulfide-oxidizing denitrifying bacteria in sulfide-poor offshore OMZ waters.

Document Type: Article
Keywords: SULFIDE OXIDATION; HYDROGEN-SULFIDE; SOUTH-PACIFIC; IDENTIFICATION; NITROGEN; WATERS; DENITRIFICATION; EDDIES; GENOME; OCEAN
Research affiliation: OceanRep > SFB 754 > B4
OceanRep > SFB 754
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
OceanRep > SFB 754 > B8
Kiel University
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1038/s41467-018-04041-x
ISSN: 2041-1723
Projects: SFB754
Expeditions/Models/Experiments:
Date Deposited: 04 May 2018 08:50
Last Modified: 01 Feb 2019 15:12
URI: http://oceanrep.geomar.de/id/eprint/42932

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