Microbial community composition and abundance after millennia of submarine permafrost warming
Warming of the Arctic led to an increase in permafrost temperatures by about 0.3 ∘ C during the last decade. Permafrost warming is associated with increasing sediment water content, permeability, and diffusivity and could in the long term alter microbial community composition and abundance even befo...
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ftdoajarticles:oai:doaj.org/article:d29ebf1713ec4504908ff32e1f554ddd 2023-05-15T15:00:39+02:00 Microbial community composition and abundance after millennia of submarine permafrost warming J. Mitzscherling F. Horn M. Winterfeld L. Mahler J. Kallmeyer P. P. Overduin L. Schirrmeister M. Winkel M. N. Grigoriev D. Wagner S. Liebner 2019-10-01T00:00:00Z https://doi.org/10.5194/bg-16-3941-2019 https://doaj.org/article/d29ebf1713ec4504908ff32e1f554ddd EN eng Copernicus Publications https://www.biogeosciences.net/16/3941/2019/bg-16-3941-2019.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-16-3941-2019 1726-4170 1726-4189 https://doaj.org/article/d29ebf1713ec4504908ff32e1f554ddd Biogeosciences, Vol 16, Pp 3941-3958 (2019) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2019 ftdoajarticles https://doi.org/10.5194/bg-16-3941-2019 2022-12-31T14:56:36Z Warming of the Arctic led to an increase in permafrost temperatures by about 0.3 ∘ C during the last decade. Permafrost warming is associated with increasing sediment water content, permeability, and diffusivity and could in the long term alter microbial community composition and abundance even before permafrost thaws. We studied the long-term effect (up to 2500 years) of submarine permafrost warming on microbial communities along an onshore–offshore transect on the Siberian Arctic Shelf displaying a natural temperature gradient of more than 10 ∘ C. We analysed the in situ development of bacterial abundance and community composition through total cell counts (TCCs), quantitative PCR of bacterial gene abundance, and amplicon sequencing and correlated the microbial community data with temperature, pore water chemistry, and sediment physicochemical parameters. On timescales of centuries, permafrost warming coincided with an overall decreasing microbial abundance, whereas millennia after warming microbial abundance was similar to cold onshore permafrost. In addition, the dissolved organic carbon content of all cores was lowest in submarine permafrost after millennial-scale warming. Based on correlation analysis, TCC, unlike bacterial gene abundance, showed a significant rank-based negative correlation with increasing temperature, while bacterial gene copy numbers showed a strong negative correlation with salinity. Bacterial community composition correlated only weakly with temperature but strongly with the pore water stable isotopes δ 18 O and δ D , as well as with depth. The bacterial community showed substantial spatial variation and an overall dominance of Actinobacteria, Chloroflexi, Firmicutes, Gemmatimonadetes, and Proteobacteria, which are amongst the microbial taxa that were also found to be active in other frozen permafrost environments. We suggest that, millennia after permafrost warming by over 10 ∘ C, microbial community composition and abundance show some indications for proliferation but mainly reflect ... Article in Journal/Newspaper Arctic permafrost Directory of Open Access Journals: DOAJ Articles Arctic Biogeosciences 16 19 3941 3958 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 J. Mitzscherling F. Horn M. Winterfeld L. Mahler J. Kallmeyer P. P. Overduin L. Schirrmeister M. Winkel M. N. Grigoriev D. Wagner S. Liebner Microbial community composition and abundance after millennia of submarine permafrost warming |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Warming of the Arctic led to an increase in permafrost temperatures by about 0.3 ∘ C during the last decade. Permafrost warming is associated with increasing sediment water content, permeability, and diffusivity and could in the long term alter microbial community composition and abundance even before permafrost thaws. We studied the long-term effect (up to 2500 years) of submarine permafrost warming on microbial communities along an onshore–offshore transect on the Siberian Arctic Shelf displaying a natural temperature gradient of more than 10 ∘ C. We analysed the in situ development of bacterial abundance and community composition through total cell counts (TCCs), quantitative PCR of bacterial gene abundance, and amplicon sequencing and correlated the microbial community data with temperature, pore water chemistry, and sediment physicochemical parameters. On timescales of centuries, permafrost warming coincided with an overall decreasing microbial abundance, whereas millennia after warming microbial abundance was similar to cold onshore permafrost. In addition, the dissolved organic carbon content of all cores was lowest in submarine permafrost after millennial-scale warming. Based on correlation analysis, TCC, unlike bacterial gene abundance, showed a significant rank-based negative correlation with increasing temperature, while bacterial gene copy numbers showed a strong negative correlation with salinity. Bacterial community composition correlated only weakly with temperature but strongly with the pore water stable isotopes δ 18 O and δ D , as well as with depth. The bacterial community showed substantial spatial variation and an overall dominance of Actinobacteria, Chloroflexi, Firmicutes, Gemmatimonadetes, and Proteobacteria, which are amongst the microbial taxa that were also found to be active in other frozen permafrost environments. We suggest that, millennia after permafrost warming by over 10 ∘ C, microbial community composition and abundance show some indications for proliferation but mainly reflect ... |
format |
Article in Journal/Newspaper |
author |
J. Mitzscherling F. Horn M. Winterfeld L. Mahler J. Kallmeyer P. P. Overduin L. Schirrmeister M. Winkel M. N. Grigoriev D. Wagner S. Liebner |
author_facet |
J. Mitzscherling F. Horn M. Winterfeld L. Mahler J. Kallmeyer P. P. Overduin L. Schirrmeister M. Winkel M. N. Grigoriev D. Wagner S. Liebner |
author_sort |
J. Mitzscherling |
title |
Microbial community composition and abundance after millennia of submarine permafrost warming |
title_short |
Microbial community composition and abundance after millennia of submarine permafrost warming |
title_full |
Microbial community composition and abundance after millennia of submarine permafrost warming |
title_fullStr |
Microbial community composition and abundance after millennia of submarine permafrost warming |
title_full_unstemmed |
Microbial community composition and abundance after millennia of submarine permafrost warming |
title_sort |
microbial community composition and abundance after millennia of submarine permafrost warming |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/bg-16-3941-2019 https://doaj.org/article/d29ebf1713ec4504908ff32e1f554ddd |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost |
genre_facet |
Arctic permafrost |
op_source |
Biogeosciences, Vol 16, Pp 3941-3958 (2019) |
op_relation |
https://www.biogeosciences.net/16/3941/2019/bg-16-3941-2019.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-16-3941-2019 1726-4170 1726-4189 https://doaj.org/article/d29ebf1713ec4504908ff32e1f554ddd |
op_doi |
https://doi.org/10.5194/bg-16-3941-2019 |
container_title |
Biogeosciences |
container_volume |
16 |
container_issue |
19 |
container_start_page |
3941 |
op_container_end_page |
3958 |
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1766332733516152832 |