Functional redundancy imparts process stability to acidic Fe(II)‐oxidizing microbial reactors. (11th October 2020)

• Record Type: Journal Article
• Authors: Ayala‐Muñoz, Diana; Simister, Rachel L.; Crowe, Sean A.; Macalady, Jennifer L.; Burgos, William D.
• Other Names: Hallsworth John E. guestEditor.; Amils Ricardo guestEditor.; Benison Kathleen C. guestEditor.; Cavalazzi Barbara guestEditor.; Davila Alfonso F. guestEditor.; Madigan Michael T. guestEditor.; Selbmann Laura guestEditor.; Westall Frances guestEditor.
• Is Part Of: Environmental microbiology. Volume 23:Number 7(2021)
• Page Start: 3682
• Page End: 3694
• Publication Date: 2020-10-11
• Subjects: Microbial ecology -- Periodicals; Environmental Microbiology -- Periodicals; 579.17
• DOI: 10.1111/1462-2920.15259
• Languages: English
• ISSNs: 1462-2912

Abstract

Summary: In previous work, lab‐scale reactors designed to study microbial Fe(II) oxidation rates at low pH were found to have stable rates under a wide range of pH and Fe(II) concentrations. Since the stirred reactor environment eliminates many of the temporal and spatial variations that promote high diversity among microbial populations in nature, we were surprised that the reactors supported multiple taxa presumed to be autotrophic Fe(II) oxidizers based on their phylogeny. Metagenomic analyses of the reactor communities revealed differences in the metabolic potential of these taxa with respect to Fe(II) oxidation and carbon fixation pathways, acquisition of potentially growth‐limiting substrates and the ability to form biofilms. Our findings support the hypothesis that the long‐term co‐existence of multiple autotrophic Fe(II)‐oxidizing populations in the reactors are due to distinct metabolic potential that supports differential growth in response to limiting resources such as nitrogen, phosphorus and oxygen. Our data also highlight the role of biofilms in creating spatially distinct geochemical niches that enable the co‐existence of multiple taxa that occupy the same apparent metabolic niche when the system is viewed in bulk. The distribution of key metabolic functions across different co‐existing taxa supported functional redundancy and imparted process stability to these reactors.