Neutrophilic, Microaerophilic Fe(II)-Oxidizing Bacteria are Ubiquitous in Aquatic Habitats of a Subtropical Australian Coastal Catchment (Ubiquitous FeOB in Catchment Aquatic Habitats)

Chang-hu, Lin; Larsen, Eloise; Nothdurft, Luke D.; Smith, James J.

doi:10.1080/01490451.2010.523446

Cited by 17 publications

(14 citation statements)

References 63 publications

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“…Dyella thiooxydans has been described as a facultative chemolithoautothotroph capable of oxidizing reduced sulfur compounds at circumneutral pH (Anandham et al, 2011). Several additional Dyella strains have been linked to chemolithotrophic oxidation of iron and sulfur compounds at circumneutral pH (Anandham et al, 2008; Emerson et al, 2012; Lin et al, 2012a; Lin et al, 2012b; Roden et al, 2012; Uroz et al, 2009). Reports from Lin et al (2012b) on the enrichment of Dyella spp.…”

Section: Discussionmentioning

confidence: 99%

“…Several additional Dyella strains have been linked to chemolithotrophic oxidation of iron and sulfur compounds at circumneutral pH (Anandham et al, 2008; Emerson et al, 2012; Lin et al, 2012a; Lin et al, 2012b; Roden et al, 2012; Uroz et al, 2009). Reports from Lin et al (2012b) on the enrichment of Dyella spp. under neutrophilic, microaerophilic, iron-oxidizing conditions from samples collected from a coastal catchment suggest that these aerobic microbes function by colonizing microoxic niches.…”

Section: Discussionmentioning

confidence: 99%

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Treatment impacts on temporal microbial community dynamics during phytostabilization of acid-generating mine tailings in semiarid regions

Valentín-Vargas

Neilson

Root

et al. 2018

Science of The Total Environment

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Direct revegetation, or phytostabilization, is a containment strategy for contaminant metals associated with mine tailings in semiarid regions. The weathering of sulfide ore-derived tailings frequently drives acidification that inhibits plant establishment resulting in materials prone to wind and water dispersal. The specific objective of this study was to associate pyritic mine waste acidification, characterized through pore-water chemistry analysis, with dynamic changes in microbial community diversity and phylogenetic composition, and to evaluate the influence of different treatment strategies on the control of acidification dynamics. Samples were collected from a highly instrumented one-year mesocosm study that included the following treatments: 1) unamended tailings control; 2) tailings amended with 15% compost; and 3) the 15% compost-amended tailings planted with Atriplex lentiformis. Tailings samples were collected at 0, 3, 6 and 12months and pore water chemistry was monitored as an indicator of acidification and weathering processes. Results confirmed that the acidification process for pyritic mine tailings is associated with a temporal progression of bacterial and archaeal phylotypes from pH sensitive Thiobacillus and Thiomonas to communities dominated by Leptospirillum and Ferroplasma. Pore-water chemistry indicated that weathering rates were highest when Leptospirillum was most abundant. The planted treatment was most successful in disrupting the successional evolution of the Fe/S-oxidizing community. Plant establishment stimulated growth of plant-growth-promoting heterotrophic phylotypes and controlled the proliferation of lithoautotrophic Fe/S-oxidizers. The results suggest the potential for eco-engineering a microbial inoculum to stimulate plant establishment and inhibit proliferation of the most efficient Fe/S-oxidizing phylotypes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Treatment impacts on temporal microbial community dynamics during phytostabilization of acid-generating mine tailings in semiarid regions

Valentín-Vargas

Neilson

Root

et al. 2018

Science of The Total Environment

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“…However, after 2 weeks at 165°C-300 MPa, sheaths broke and cell size was significantly reduced, whereas after 3-4 weeks sheaths were highly degraded and cells hardly visible 14,15 . In natural environments, stalks accumulate various amounts of Fe minerals and can appear heavily encrusted 39 . Therefore, it is possible that crystal growth continues if diagenetic conditions are maintained for long durations and that stalk morphology and mineral textures become completely obliterated.…”

Section: Discussionmentioning

confidence: 99%

Experimental diagenesis of organo-mineral structures formed by microaerophilic Fe(II)-oxidizing bacteria

et al. 2015

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Twisted stalks are organo-mineral structures produced by some microaerophilic Fe(II)-oxidizing bacteria at O 2 concentrations as low as 3 mM. The presence of these structures in rocks having experienced a diagenetic history could indicate microbial Fe(II)-oxidizing activity as well as localized abundance of oxygen at the time of sediment deposition. Here we use spectroscopy and analytical microscopy to evaluate if-and what kind of-transformations occur in twisted stalks through experimental diagenesis. Unique mineral textures appear on stalks as temperature and pressure conditions increase. Haematite and magnetite form from ferrihydrite at 170°C-120 MPa. Yet the twisted morphology of the stalks, and the organic matrix, mainly composed of long-chain saturated aliphatic compounds, are preserved at 250°C-140 MPa. Our results suggest that iron minerals might play a role in maintaining the structural and chemical integrity of stalks under diagenetic conditions and provide spectroscopic signatures for the search of ancient life in the rock record.

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“…Natural porewaters of streambank and coastal aquifers also host FeOM. Culturing and 16S rRNA gene surveys show that microaerophilic FeOM proliferate in shallow groundwater just before it flows out into oxic surface water (Gan et al, 2006;Yu et al, 2010;Lin et al, 2012), as well as in deeper groundwater (Ben Maamar et al, 2015). A metagenomic/transcriptomic study of an alluvial aquifer demonstrated both the presence and activity of Gallionellales, which dominated the metagenome/transcriptome at times (Jewell et al, 2016).…”

Section: Fe Oxidation In Sediment and Groundwatermentioning

confidence: 99%

The role of microaerophilic Fe‐oxidizing micro‐organisms in producing banded iron formations

2016

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Despite the historical and economic significance of banded iron formations (BIFs), we have yet to resolve the formation mechanisms. On modern Earth, neutrophilic microaerophilic Fe-oxidizing micro-organisms (FeOM) produce copious amounts of Fe oxyhydroxides, leading us to wonder whether similar organisms played a role in producing BIFs. To evaluate this, we review the current knowledge of modern microaerophilic FeOM in the context of BIF paleoenvironmental studies. In modern environments wherever Fe(II) and O2 co-exist, microaerophilic FeOM proliferate. These organisms grow in a variety of environments, including the marine water column redoxcline, which is where BIF precursor minerals likely formed. FeOM can grow across a range of O2 concentrations, measured as low as 2 μm to date, although lower concentrations have not been tested. While some extant FeOM can tolerate high O2 concentrations, many FeOM appear to prefer and thrive at low O2 concentrations (~3-25 μm). These are similar to the estimated dissolved O2 concentrations in the few hundred million years prior to the 'Great Oxidation Event' (GOE). We compare biotic and abiotic Fe oxidation kinetics in the presence of varying levels of O2 and show that microaerophilic FeOM contribute substantially to Fe oxidation, at rates fast enough to account for BIF deposition. Based on this synthesis, we propose that microaerophilic FeOM were capable of playing a significant role in depositing the largest, most well-known BIFs associated with the GOE, as well as afterward when global O2 levels increased.

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Neutrophilic, Microaerophilic Fe(II)-Oxidizing Bacteria are Ubiquitous in Aquatic Habitats of a Subtropical Australian Coastal Catchment (Ubiquitous FeOB in Catchment Aquatic Habitats)

Cited by 17 publications

References 63 publications

Treatment impacts on temporal microbial community dynamics during phytostabilization of acid-generating mine tailings in semiarid regions

Treatment impacts on temporal microbial community dynamics during phytostabilization of acid-generating mine tailings in semiarid regions

Experimental diagenesis of organo-mineral structures formed by microaerophilic Fe(II)-oxidizing bacteria

The role of microaerophilic Fe‐oxidizing micro‐organisms in producing banded iron formations

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