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Microbial community dynamics and coexistence in a sulfide-driven phototrophic bloom

Srijak Bhatnagar, Elise S. Cowley, Sebastian H. Kopf, Sherlynette Pérez Castro, Sean Kearney, Scott C. Dawson, Kurt Hanselmann, S. Emil Ruff
doi: https://doi.org/10.1101/604504
Srijak Bhatnagar
Geomicrobiology Group, University of Calgary, Alberta, Canada; srijak.bhatnagar@ucalgary.ca
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  • For correspondence: srijak.bhatnagar@ucalgary.ca
Elise S. Cowley
Medical Scientist Training Program, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, USA; ecowley@wisc.edu
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  • For correspondence: ecowley@wisc.edu
Sebastian H. Kopf
Department of Geological Sciences, University of Colorado, Boulder, CO, USA; sebastian.kopf@colorado.edu
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  • For correspondence: sebastian.kopf@colorado.edu
Sherlynette Pérez Castro
Ecosystems Center/Bay Paul Center, Marine Biological Laboratory, Woods Hole, MA, USA; sperezcastro@mbl.edu
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  • For correspondence: sperezcastro@mbl.edu
Sean Kearney
Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA; skearney@mit.edu
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  • For correspondence: skearney@mit.edu
Scott C. Dawson
Department of Microbiology and Molecular Genetics, University of California Davis, CA, USA; scdawson@ucdavis.edu
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  • For correspondence: scdawson@ucdavis.edu
Kurt Hanselmann
Department of Earth Sciences, ETH-Z, Zürich, CH; kurt.hanselmann@erdw.ethz.ch
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  • For correspondence: kurt.hanselmann@erdw.ethz.ch
S. Emil Ruff
Ecosystems Center/Bay Paul Center, Marine Biological Laboratory, Woods Hole, MA, USA; eruff@mbl.edu
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  • For correspondence: s.emil.ruff@gmail.com eruff@mbl.edu
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Abstract

Phototrophic microbial mats commonly contain multiple phototrophic lineages that coexist based on their light, oxygen and nutrient preferences. Here we show that similar coexistence patterns and ecological niches can occur in suspended phototrophic blooms of an organic-rich estuary. The water column showed steep gradients of oxygen, pH, sulfate, sulfide, and salinity. The upper part of the bloom was dominated by aerobic phototrophic Cyanobacteria, the middle and lower parts were dominated by anoxygenic purple sulfur bacteria (Chromatiales) and green sulfur bacteria (Chlorobiales), respectively. We found multiple uncultured phototrophic lineages and present metagenome-assembled genomes of two uncultured organisms within the Chlorobiales. Apparently, those Chlorobiales populations were affected by Microviridae viruses. We suggest a cryptic sulfur cycle within the bloom in which elemental sulfur produced by phototrophs is reduced to sulfide by Desulfuromonas sp. These findings improve our understanding of the ecology and ecophysiology of phototrophic blooms and their impact on biogeochemical cycles.

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Posted April 10, 2019.
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Microbial community dynamics and coexistence in a sulfide-driven phototrophic bloom
Srijak Bhatnagar, Elise S. Cowley, Sebastian H. Kopf, Sherlynette Pérez Castro, Sean Kearney, Scott C. Dawson, Kurt Hanselmann, S. Emil Ruff
bioRxiv 604504; doi: https://doi.org/10.1101/604504
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Microbial community dynamics and coexistence in a sulfide-driven phototrophic bloom
Srijak Bhatnagar, Elise S. Cowley, Sebastian H. Kopf, Sherlynette Pérez Castro, Sean Kearney, Scott C. Dawson, Kurt Hanselmann, S. Emil Ruff
bioRxiv 604504; doi: https://doi.org/10.1101/604504

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