Experimental warming alters the community composition, diversity, and N 2 fixation activity of peat moss ( Sphagnum fallax ) microbiomes

Carrell, Alyssa A.; Kolton, Max; Glass, Jennifer B.; Pelletier, Dale A.; Warren, Melissa J.; Kostka, Joel E.; Iversen, Colleen M.; Hanson, Paul J.; Weston, David J.

doi:10.1111/gcb.14715

Title: Experimental warming alters the community composition, diversity, and N ₂ fixation activity of peat moss ( Sphagnum fallax ) microbiomes

Journal Article · Mon May 27 00:00:00 EDT 2019 · Global Change Biology

DOI:https://doi.org/10.1111/gcb.14715· OSTI ID:1560689

^[1]; Kolton, Max ^[2];

^[3]; Pelletier, Dale A. ^[4]; Warren, Melissa J. ^[3]; Kostka, Joel E. ^[5]; Iversen, Colleen M. ^[6]; Hanson, Paul J. ^[6];

^[7]

Bredesen Center for Interdisciplinary Research and Graduate Education University of Tennessee Knoxville Tennessee, Biosciences Division Oak Ridge National Laboratory Oak Ridge Tennessee
School of Biology Georgia Institute of Technology Atlanta Georgia
School of Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta Georgia
Biosciences Division Oak Ridge National Laboratory Oak Ridge Tennessee
School of Biology Georgia Institute of Technology Atlanta Georgia, School of Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta Georgia
Environmental Sciences Division Oak Ridge National Laboratory Oak Ridge Tennessee, Climate Change Science Institute, Oak Ridge National Laboratory Oak Ridge Tennessee
Biosciences Division Oak Ridge National Laboratory Oak Ridge Tennessee, Climate Change Science Institute, Oak Ridge National Laboratory Oak Ridge Tennessee

SphagnumSphagnum are known to harbor diverse microbial communities that mediate C and nitrogen (N) cycling in peatlands, the effects of climate change on Sphagnum microbiome composition and functioning are largely unknown. We investigated the impacts of experimental whole-ecosystem warming on the Sphagnum moss microbiome, focusing on N₂ fixing microorganisms (diazotrophs). To characterize the microbiome response to warming, we performed next-generation sequencing of small subunit (SSU) rRNA and nitrogenase (niƒH) gene amplicons and quantified rates of N₂ fixation activity in Sphagnum fallax2 fixation rates, decreased with warming (p < 0.05). Following warming, diazotrophs shifted from a mixed community of Nostocales (Cyanobacteria) and Rhizobiales (Alphaproteobacteria) to predominance of Nostocales. Microbiome community composition differed between years, with some diazotroph populations persisting while others declined in relative abundance in warmed plots in the second year. Our results demonstrate that warming substantially alters the community composition, diversity, and N₂ fixation activity of peat moss microbiomes, which may ultimately impact host fitness, ecosystem productivity, and C storage potential in peatlands.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC05-00OR22725; SC0007144; SC0012088

OSTI ID:: 1560689

Alternate ID(s):: OSTI ID: 1559747; OSTI ID: 1560690

Journal Information:: Global Change Biology, Journal Name: Global Change Biology Vol. 25 Journal Issue: 9; ISSN 1354-1013

Publisher:: WileyCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 68 works

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Title: Experimental warming alters the community composition, diversity, and N 2 fixation activity of peat moss ( Sphagnum fallax ) microbiomes

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