ArticleFrontiers in microbiology2012
Microbial Iron(II) Oxidation in Littoral Freshwater Lake Sediment: The Potential for Competition between Phototrophic vs. Nitrate-Reducing Iron(II)-Oxidizers.
Article in Frontiers in microbiology, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers, 1 of them a synthesis that pooled it.
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Who cites it
14 citing papers in PubMed, 1 synthesis or guideline pooled it, 60 citations in OpenAlex.
- Pooled it
- Inhibition of phototrophic iron oxidation by nitric oxide in ferruginous environments.Nature geoscience · 2024Article
- Continuous cultivation of the lithoautotrophic nitrate-reducing Fe(II)-oxidizing culture KS in a chemostat bioreactor.Environmental microbiology reports · 2023Article
- Microbial mixotrophic denitrification using iron(II) as an assisted electron donor.Water research X · 2023Article
- Microbial biofilms as living photoconductors due to ultrafast electron transfer in cytochrome OmcS nanowires.Nature communications · 2022Article
- Review
- Insights into Carbon Metabolism Provided by FluorescenceApplied and environmental microbiology · 2018Article
- Photoferrotrophy: Remains of an Ancient Photosynthesis in Modern Environments.Frontiers in microbiology · 2017Review
- Evidence for the Existence of Autotrophic Nitrate-Reducing Fe(II)-Oxidizing Bacteria in Marine Coastal Sediment.Applied and environmental microbiology · 2016Article
- The interplay of microbially mediated and abiotic reactions in the biogeochemical Fe cycle.Nature reviews. Microbiology · 2014Review
- Potential role of nitrite for abiotic Fe(II) oxidation and cell encrustation during nitrate reduction by denitrifying bacteria.Applied and environmental microbiology · 2014Article
- Chemolithotrophic nitrate-dependent Fe(II)-oxidizing nature of actinobacterial subdivision lineage TM3.The ISME journal · 2013Article
- Nitrate-dependent ferrous iron oxidation by anaerobic ammonium oxidation (anammox) bacteria.Applied and environmental microbiology · 2013Article
- The microbial ferrous wheel: iron cycling in terrestrial, freshwater, and marine environments.Frontiers in microbiology · 2012Article
Corrections and comments
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Authors and funding
3 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The distribution of neutrophilic microbial iron oxidation is mainly determined by local gradients of oxygen, light, nitrate and ferrous iron. In the anoxic top part of littoral freshwater lake sediment, nitrate-reducing and phototrophic Fe(II)-oxidizers compete for the same e(-) donor; reduced iron. It is not yet understood how these microbes co-exist in the sediment and what role they play in the Fe cycle. We show that both metabolic types of anaerobic Fe(II)-oxidizing microorganisms are present in the same sediment layer directly beneath the oxic-anoxic sediment interface. The photoferrotrophic most probable number counted 3.4·10(5) cells·g(-1) and the autotrophic and mixotrophic nitrate-reducing Fe(II)-oxidizers totaled 1.8·10(4) and 4.5·10(4) cells·g(-1) dry weight sediment, respectively. To distinguish between the two microbial Fe(II) oxidation processes and assess their individual contribution to the sedimentary Fe cycle, littoral lake sediment was incubated in microcosm experiments. Nitrate-reducing Fe(II)-oxidizing bacteria exhibited a higher maximum Fe(II) oxidation rate per cell, in both pure cultures and microcosms, than photoferrotrophs. In microcosms, photoferrotrophs instantly started oxidizing Fe(II), whilst nitrate-reducing Fe(II)-oxidizers showed a significant lag-phase during which they probably use organics as e(-) donor before initiating Fe(II) oxidation. This suggests that they will be outcompeted by phototrophic Fe(II)-oxidizers during optimal light conditions; as phototrophs deplete Fe(II) before nitrate-reducing Fe(II)-oxidizers start Fe(II) oxidation. Thus, the co-existence of the two anaerobic Fe(II)-oxidizers may be possible due to a niche space separation in time by the day-night cycle, where nitrate-reducing Fe(II)-oxidizers oxidize Fe(II) during darkness and phototrophs play a dominant role in Fe(II) oxidation during daylight. Furthermore, metabolic flexibility of Fe(II)-oxidizing microbes may play a paramount role in the conservation of the sedimentary Fe cycle.
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