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Methane Cycling Microbial Community Characteristics: Comparing Natural, Actively Extracted, Restored and Unrestored Boreal Peatlands

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Abstract

The microbial community in peat is responsible for organic matter degradation and greenhouse gas emissions, yet its response to peat extraction and peatland restoration remains poorly understood. We investigated how different physicochemical conditions in natural, restored, unrestored, and actively extracted peatlands influenced the methanogenic and methanotrophic community characteristics. 16S rRNA amplicon sequencing allowed for the comparison of the abundance of both groups. The communities were similar at sites restored in 1991 and 2009 (25 and 7 years prior to our research) that had high water table and were dominated by sedges. A different, shared pattern of microbial membership was observed at natural, unrestored, and actively extracted sites, and a site restored in 2012 (4 years prior to the research). These similarities were reflected in peat chemistry and hydrology in canonical correspondence analysis (CCA) ordination that was used to investigate how these factors affected the abundances of methane cycling taxa. Based on the CCA, methanotrophs reached their highest abundances close to the water table, at high and moderate concentrations of phosphate and propionate, and low concentrations of formate. Methanogens exhibited a more distributed pattern, with organisms responding to opposite conditions along these environmental gradients. Methane-cycling community in older restored sites departed from the reference community at the natural bog likely due to the fen-like conditions that developed at these sites.

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Data Availability

The raw reads are available in the NCBI SRA database under BioProject number: PRJNA640052, BioSample numbers: SAMN15297727—SAMN15297845. Raw peat chemistry and quality control data are available on Scholars Portal Dataverse https://doi.org/10.5683/SP2/R6FCJV.

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Acknowledgements

We thank Angus Hilts, Emilie Spasov, and Alexandra Sauk for brainstorming and advising on molecular data analysis, Dr. Martin Brummell and Erin McDonald for field work assistance, Joanna Chudyk and Rebecca Co from the Hug Lab UW, Marianne Vandergriendt and Amanda Nidercorn from the Ecohydrology Research Group UW, Anne Grant and Beverly Raimbault from the Ecology Lab UW, and Mathew Coulas, Alexandra Engering, and Rhiannon Hodgson from the Wetland Soils & Greenhouse Gas Exchange Lab UW for assistance in the laboratory analyses. Dr. N. Basiliko, Dr. S. J. Davidson, and Dr. M. Macrae provided valuable feedback on the manuscript. Sungro Horticulture provided site access and logistical support. The symbols used in the feature image are courtesy of the Integration and Application Network, University of Maryland Center for Environmental Science (ian.umces.edu/symbols/).

Funding

This work was supported by Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grants [342020 to MS, 2016–03686 to LAH]; NSERC Collaborative Research and Development grant with support from the Canadian Sphagnum Peat Moss Association and its members [437463 to MS]; the Canada Excellence Research Chair in Ecohydrology (grant number not applicable); Canada First Excellence Research Fund (CFREF): Global Water Futures (GWF) program (grant number not applicable); and Joint Genome Institute: Small Scale sequencing grant [CSP 2812, LAH]. LAH holds a Tier II Canada Research Chair in Environmental Microbiology and MS holds a Tier II Canada Research Chair in Ecosystem and Climate.

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Aneta Bieniada: Conceptualization, Formal Analysis, Investigation, Data Curation, Writing-Original Draft, Visualization, Project Administration. Laura A. Hug: Supervision, Resources, Funding Acquisition, Writing – Review & Editing. Christopher T. Parsons: Supervision, Resources, Writing – Review & Editing. Maria Strack: Supervision, Resources, Funding Acquisition, Writing – Review & Editing.

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Correspondence to Aneta Bieniada.

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The authors declare that they have no conflict of interest that could have appeared to influence the work reported in this paper.

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Bieniada, A., Hug, L.A., Parsons, C.T. et al. Methane Cycling Microbial Community Characteristics: Comparing Natural, Actively Extracted, Restored and Unrestored Boreal Peatlands. Wetlands 43, 83 (2023). https://doi.org/10.1007/s13157-023-01726-y

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  • DOI: https://doi.org/10.1007/s13157-023-01726-y

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