Cobalt(II) Oxidation by the Marine Manganese(II)-Oxidizing
            <i>Bacillus</i>
            sp. Strain SG-1

Lee, Yoon; Tebo, Bradley M.

doi:10.1128/aem.60.8.2949-2957.1994

Cited by 85 publications

(39 citation statements)

References 53 publications

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“…The deep Co maxima just above the primary nitrite maxima provide the first evidence, to our knowledge, of Co redox activity outside of the permanently anoxic basins or sedimentary environments (Kremling 1983). Moreover, given the propensity of Co to be cooxidized by Mn-oxidizing bacteria (Lee and Tebo 1994;Moffett and Ho 1996), it is of note that the four Mn profiles measured in this region at Sta. 11 and 14 and to a lesser extent Sta.…”

Section: Discussionmentioning

confidence: 68%

The unique trace metal and mixed layer conditions of the Costa Rica upwelling dome support a distinct and dense community of Synechococcus

Ahlgren

Noble

Patton

et al. 2014

Limnology & Oceanography

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The Costa Rica Dome (CRD) is a wind-driven upwelling feature in the eastern tropical Pacific that supports unusually high concentrations (. 10 6 cells mL 21 ) of the picocyanobacteria Prochlorococcus and Synechococcus. To understand what causes this unusual phytoplankton bloom, we conducted a comprehensive survey of the hydrography, picophytoplankton population structure, and trace metal chemistry of the CRD and surrounding oligotrophic and equatorial upwelling waters. Based on size-fractionated chlorophyll, picoplankton dominated phytoplankton biomass in the region, and the three water regimes sampled supported different assemblages of Prochlorococcus, Synechococcus, and eukaryotic picophytoplankton. Cobalt (Co), a required nutrient for cyanobacteria, was strongly complexed in surface waters and was at least twice as high in the photic zone of the CRD than in surrounding waters. In contrast, iron (Fe) and manganese (Mn) levels were comparable in and outside the CRD. Synechococcus clades II and CRD1 and Prochlorococcus ecotype eMIT9312 (high light II) were the dominant genotypes throughout the region, as assessed by quantitative polymerase chain reaction assays. The composition of less abundant Synechococcus clade subpopulations differed in and outside the CRD and within the CRD. Co, mixed layer depth, and temperature were the important drivers of both total Synechococcus abundance and cyanobacterial community composition. This supports a model whereby the combination of upwelled macronutrients, high concentrations of complexed Co, and Fe and Mn scarcity in the warm, shallow mixed layer of the CRD limit larger phytoplankton and induce dense concentrations of picocyanobacteria. Globally, we suggest that trace metals influence phytoplankton distributions at both the broad (cyanobacterial vs. eukaryotic) and the fine (ecotype-level) taxonomic levels.

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Section: Discussionmentioning

confidence: 68%

The unique trace metal and mixed layer conditions of the Costa Rica upwelling dome support a distinct and dense community of Synechococcus

Ahlgren

Noble

Patton

et al. 2014

Limnology & Oceanography

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“…To verify Mn(II) oxidation, a 0.1% (in 1% acetic acid) leucoberbelin blue (LBB) solution was added to the plug. If present, the formation of Mn(III) oxides is seen as a band of a dark blue precipitate in the presence of this dye (Lee & Tebo, 1994). If Fe(III) oxides are formed in the gel-stabilized gradient tubes, a black precipitate forms (Emerson & Moyer, 1997).…”

Section: Electron Donors Used For Growthmentioning

confidence: 99%

Novel autotrophic arsenite-oxidizing bacteria isolated from soil and sediments

Garcia-Dominguez

Mumford

Rhine

et al. 2008

FEMS Microbiology Ecology

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Arsenic oxidation is recognized as being mediated by both heterotrophic and chemoautotrophic microorganisms. Enrichment cultures were established to determine whether chemoautotrophic microorganisms capable of oxidizing arsenite As(III) to arsenate As(V) are present in selected contaminated but nonextreme environments. Three new organisms, designated as strains OL-1, S-1 and CL-3, were isolated and found to oxidize 10 mM arsenite to arsenate under aerobic conditions using CO2-bicarbonate (CO2/HCO3-) as a carbon source. Based on 16S rRNA gene sequence analyses, strain OL-1 was 99% most closely related to the genus Ancylobacter, strain S-1 was 99% related to Thiobacillus and strain CL-3 was 98% related to the genus Hydrogenophaga. The isolates are facultative autotrophs and growth of isolated strains on different inorganic electron donors other than arsenite showed that all three had a strong preference for several sulfur species, while CL-3 was also able to grow on ammonium and nitrite. The RuBisCO Type I (cbbL) gene was positively amplified and sequenced in strain CL-3, and the Type II (cbbM) gene was detected in strains OL-1 and S-1, supporting the autotrophic nature of the organisms.

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“…DCo Removal in the Intermediate and Deep Sea The adsorption of inorganic Co onto particulate MnOx and/or its oxidation into insoluble Co oxides that precipitate are major pathways of DCo removal in the deep sea [Murray, 1975]. These processes (called scavenging hereafter) can be catalyzed by manganese oxidative bacteria [Lee and Tebo, 1994;Moffett and Ho, 1996] and Figure 2c). Values are in accordance with Bethoux [1980] and van Cappellen et al [2014].…”

Section: Dco Fluxes At the Sicily Channelmentioning

confidence: 99%

The biogeochemistry of cobalt in the Mediterranean Sea

Dulaquais

Planquette

L’Helguen

et al. 2017

Global Biogeochemical Cycles

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The soluble (sCo < 0.02 μm), dissolved (DCo < 0.2 μm), colloidal (cCo, as DCo minus sCo), and the particulate (pCo > 0.2 μm) fractions of cobalt were investigated along the GEOTRACES-A04 section. Our results show that sCo was the predominant form (90%) of the DCo in the Mediterranean Sea and that cCo and pCo generally followed the same distribution, suggesting a biogeochemical link between these two fractions. In the Mediterranean Sea, DCo displayed an overall scavenged-like profile in the different sub-basins, with high concentrations (up to 350 pM) in surface and quasi-uniformed low concentrations of DCo (~45 pM) in the deep sea. However, the decoupling between the surface and the deep reservoirs suggested that the transfer of Co from dissolved to particulate pools during the sink of particles may not be the only process governing DCo distribution. High-surface Co inputs, stabilization of DCo in a soluble form, and the extremely high regeneration rate of biogenic pCo all lead to the accumulation of DCo in surface. Conversely, low pCo export from the surface waters, low remineralization of biogenic pCo, and slow but efficient removal of DCo by scavenging including colloid aggregation into particles prevented its accumulation in the intermediate and deep sea. Moreover, Mediterranean circulation prevented the exchanges between the DCo-rich surface and the DCo-poor deep layers enhancing the scavenged-like profile of DCo. Finally, tentative DCo budgets were balanced at basin scale and showed the strong imprint of the surface inputs at Gibraltar Strait on the Mediterranean cobalt biogeochemistry.

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Cobalt(II) Oxidation by the Marine Manganese(II)-Oxidizing Bacillus sp. Strain SG-1

Cited by 85 publications

References 53 publications

The unique trace metal and mixed layer conditions of the Costa Rica upwelling dome support a distinct and dense community of Synechococcus

The unique trace metal and mixed layer conditions of the Costa Rica upwelling dome support a distinct and dense community of Synechococcus

Novel autotrophic arsenite-oxidizing bacteria isolated from soil and sediments

The biogeochemistry of cobalt in the Mediterranean Sea

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