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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American Society for Microbiology
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ftcaltechauth:oai:authors.library.caltech.edu:110676 2023-05-15T17:55:22+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 application/pdf https://authors.library.caltech.edu/110676/ https://authors.library.caltech.edu/110676/3/AEM.01339-21.pdf https://resolver.caltech.edu/CaltechAUTHORS:20210831-221808372 en eng American Society for Microbiology https://authors.library.caltech.edu/110676/3/AEM.01339-21.pdf Douglas, Madison M. and Lingappa, Usha F. and Lamb, Michael P. and Rowland, Joel C. and West, A. Joshua and Li, Gen and Kemeny, Preston C. and Chadwick, Austin J. and Piliouras, Anastasia and Schwenk, Jon and Fischer, Woodward W. (2021) Impact of River Channel Lateral Migration on Microbial Communities across a Discontinuous Permafrost Floodplain. Applied and Environmental Microbiology, 87 (20). Art. No. e01339-21. ISSN 0099-2240. PMCID PMC8478453. doi:10.1128/aem.01339-21. https://resolver.caltech.edu/CaltechAUTHORS:20210831-221808372 <https://resolver.caltech.edu/CaltechAUTHORS:20210831-221808372> other Article PeerReviewed 2021 ftcaltechauth https://doi.org/10.1128/aem.01339-21 2022-07-07T17:53:24Z 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. Article in Journal/Newspaper permafrost Yukon river Alaska Yukon Caltech Authors (California Institute of Technology) Yukon Applied and Environmental Microbiology 87 20 |
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Caltech Authors (California Institute of Technology) |
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ftcaltechauth |
language |
English |
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. |
format |
Article in Journal/Newspaper |
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. |
spellingShingle |
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 |
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 |
https://authors.library.caltech.edu/110676/ https://authors.library.caltech.edu/110676/3/AEM.01339-21.pdf https://resolver.caltech.edu/CaltechAUTHORS:20210831-221808372 |
geographic |
Yukon |
geographic_facet |
Yukon |
genre |
permafrost Yukon river Alaska Yukon |
genre_facet |
permafrost Yukon river Alaska Yukon |
op_relation |
https://authors.library.caltech.edu/110676/3/AEM.01339-21.pdf Douglas, Madison M. and Lingappa, Usha F. and Lamb, Michael P. and Rowland, Joel C. and West, A. Joshua and Li, Gen and Kemeny, Preston C. and Chadwick, Austin J. and Piliouras, Anastasia and Schwenk, Jon and Fischer, Woodward W. (2021) Impact of River Channel Lateral Migration on Microbial Communities across a Discontinuous Permafrost Floodplain. Applied and Environmental Microbiology, 87 (20). Art. No. e01339-21. ISSN 0099-2240. PMCID PMC8478453. doi:10.1128/aem.01339-21. https://resolver.caltech.edu/CaltechAUTHORS:20210831-221808372 <https://resolver.caltech.edu/CaltechAUTHORS:20210831-221808372> |
op_rights |
other |
op_doi |
https://doi.org/10.1128/aem.01339-21 |
container_title |
Applied and Environmental Microbiology |
container_volume |
87 |
container_issue |
20 |
_version_ |
1766163293105291264 |