Impact of River Channel Lateral Migration on Microbial Communities across a Discontinuous Permafrost Floodplain
Permafrost soils store approximately twice the amount of carbon currently present in Earth’s atmosphere and are acutely impacted by climate change due to the polar amplification of increasing global temperature. Many organic-rich permafrost sediments are located on large river floodplains, where riv...
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ftpubmed:oai:pubmedcentral.nih.gov:8478453 2023-05-15T15:13:43+02:00 Impact of River Channel Lateral Migration on Microbial Communities across a Discontinuous Permafrost Floodplain Douglas, Madison M. Lingappa, Usha F. Lamb, Michael P. Rowland, Joel C. West, A. Joshua Li, Gen Kemeny, Preston C. Chadwick, Austin J. Piliouras, Anastasia Schwenk, Jon Fischer, Woodward W. 2021-09-28 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8478453/ http://www.ncbi.nlm.nih.gov/pubmed/34347514 https://doi.org/10.1128/AEM.01339-21 en eng American Society for Microbiology http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8478453/ http://www.ncbi.nlm.nih.gov/pubmed/34347514 http://dx.doi.org/10.1128/AEM.01339-21 Copyright © 2021 American Society for Microbiology. https://doi.org/10.1128/ASMCopyrightv2All Rights Reserved (https://doi.org/10.1128/ASMCopyrightv2) . Appl Environ Microbiol Environmental Microbiology Text 2021 ftpubmed https://doi.org/10.1128/AEM.01339-21 2022-04-03T00:40:06Z Permafrost soils store approximately twice the amount of carbon currently present in Earth’s atmosphere and are acutely impacted by climate change due to the polar amplification of increasing global temperature. Many organic-rich permafrost sediments are located on large river floodplains, where river channel migration periodically erodes and redeposits the upper tens of meters of sediment. Channel migration exerts a first-order control on the geographic distribution of permafrost and floodplain stratigraphy and thus may affect microbial habitats. To examine how river channel migration in discontinuous permafrost environments affects microbial community composition, we used amplicon sequencing of the 16S rRNA gene on sediment samples from floodplain cores and exposed riverbanks along the Koyukuk River, a large tributary of the Yukon River in west-central Alaska. Microbial communities are sensitive to permafrost thaw: communities found in deep samples thawed by the river closely resembled near-surface active-layer communities in nonmetric multidimensional scaling analyses but did not resemble floodplain permafrost communities at the same depth. Microbial communities also displayed lower diversity and evenness in permafrost than in both the active layer and permafrost-free point bars recently deposited by river channel migration. Taxonomic assignments based on 16S and quantitative PCR for the methyl coenzyme M reductase functional gene demonstrated that methanogens and methanotrophs are abundant in older permafrost-bearing deposits but not in younger, nonpermafrost point bar deposits. The results suggested that river migration, which regulates the distribution of permafrost, also modulates the distribution of microbes potentially capable of producing and consuming methane on the Koyukuk River floodplain. IMPORTANCE Arctic lowlands contain large quantities of soil organic carbon that is currently sequestered in permafrost. With rising temperatures, permafrost thaw may allow this carbon to be consumed by microbial ... Text Arctic Climate change permafrost Yukon river Alaska Yukon PubMed Central (PMC) Arctic Yukon Applied and Environmental Microbiology 87 20 |
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PubMed Central (PMC) |
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language |
English |
topic |
Environmental Microbiology |
spellingShingle |
Environmental Microbiology Douglas, Madison M. Lingappa, Usha F. Lamb, Michael P. Rowland, Joel C. West, A. Joshua Li, Gen Kemeny, Preston C. Chadwick, Austin J. Piliouras, Anastasia Schwenk, Jon Fischer, Woodward W. Impact of River Channel Lateral Migration on Microbial Communities across a Discontinuous Permafrost Floodplain |
topic_facet |
Environmental Microbiology |
description |
Permafrost soils store approximately twice the amount of carbon currently present in Earth’s atmosphere and are acutely impacted by climate change due to the polar amplification of increasing global temperature. Many organic-rich permafrost sediments are located on large river floodplains, where river channel migration periodically erodes and redeposits the upper tens of meters of sediment. Channel migration exerts a first-order control on the geographic distribution of permafrost and floodplain stratigraphy and thus may affect microbial habitats. To examine how river channel migration in discontinuous permafrost environments affects microbial community composition, we used amplicon sequencing of the 16S rRNA gene on sediment samples from floodplain cores and exposed riverbanks along the Koyukuk River, a large tributary of the Yukon River in west-central Alaska. Microbial communities are sensitive to permafrost thaw: communities found in deep samples thawed by the river closely resembled near-surface active-layer communities in nonmetric multidimensional scaling analyses but did not resemble floodplain permafrost communities at the same depth. Microbial communities also displayed lower diversity and evenness in permafrost than in both the active layer and permafrost-free point bars recently deposited by river channel migration. Taxonomic assignments based on 16S and quantitative PCR for the methyl coenzyme M reductase functional gene demonstrated that methanogens and methanotrophs are abundant in older permafrost-bearing deposits but not in younger, nonpermafrost point bar deposits. The results suggested that river migration, which regulates the distribution of permafrost, also modulates the distribution of microbes potentially capable of producing and consuming methane on the Koyukuk River floodplain. IMPORTANCE Arctic lowlands contain large quantities of soil organic carbon that is currently sequestered in permafrost. With rising temperatures, permafrost thaw may allow this carbon to be consumed by microbial ... |
format |
Text |
author |
Douglas, Madison M. Lingappa, Usha F. Lamb, Michael P. Rowland, Joel C. West, A. Joshua Li, Gen Kemeny, Preston C. Chadwick, Austin J. Piliouras, Anastasia Schwenk, Jon Fischer, Woodward W. |
author_facet |
Douglas, Madison M. Lingappa, Usha F. Lamb, Michael P. Rowland, Joel C. West, A. Joshua Li, Gen Kemeny, Preston C. Chadwick, Austin J. Piliouras, Anastasia Schwenk, Jon Fischer, Woodward W. |
author_sort |
Douglas, Madison M. |
title |
Impact of River Channel Lateral Migration on Microbial Communities across a Discontinuous Permafrost Floodplain |
title_short |
Impact of River Channel Lateral Migration on Microbial Communities across a Discontinuous Permafrost Floodplain |
title_full |
Impact of River Channel Lateral Migration on Microbial Communities across a Discontinuous Permafrost Floodplain |
title_fullStr |
Impact of River Channel Lateral Migration on Microbial Communities across a Discontinuous Permafrost Floodplain |
title_full_unstemmed |
Impact of River Channel Lateral Migration on Microbial Communities across a Discontinuous Permafrost Floodplain |
title_sort |
impact of river channel lateral migration on microbial communities across a discontinuous permafrost floodplain |
publisher |
American Society for Microbiology |
publishDate |
2021 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8478453/ http://www.ncbi.nlm.nih.gov/pubmed/34347514 https://doi.org/10.1128/AEM.01339-21 |
geographic |
Arctic Yukon |
geographic_facet |
Arctic Yukon |
genre |
Arctic Climate change permafrost Yukon river Alaska Yukon |
genre_facet |
Arctic Climate change permafrost Yukon river Alaska Yukon |
op_source |
Appl Environ Microbiol |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8478453/ http://www.ncbi.nlm.nih.gov/pubmed/34347514 http://dx.doi.org/10.1128/AEM.01339-21 |
op_rights |
Copyright © 2021 American Society for Microbiology. https://doi.org/10.1128/ASMCopyrightv2All Rights Reserved (https://doi.org/10.1128/ASMCopyrightv2) . |
op_doi |
https://doi.org/10.1128/AEM.01339-21 |
container_title |
Applied and Environmental Microbiology |
container_volume |
87 |
container_issue |
20 |
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1766344235584323584 |