Erosion of ancient Arctic permafrost: transcriptomics reveal microbiome changes
Permafrost soils currently store about twice as much carbon as deposited in the atmosphere, and alone Arctic permafrost is estimated to capture 1850 Gt carbon. As these usually remain frozen in summer, often even for millennia, decomposition rates are low. With global warming though, both the season...
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ftuniaarhuspubl:oai:pure.atira.dk:publications/a313bcd1-2eb3-45d4-af0a-3b0ee4b135cd 2023-06-11T04:07:28+02:00 Erosion of ancient Arctic permafrost: transcriptomics reveal microbiome changes Scheel, Maria Zervas, Athanasios Jacobsen, Carsten Suhr Christensen, Torben Røjle 2022 https://pure.au.dk/portal/da/publications/erosion-of-ancient-arctic-permafrost-transcriptomics-reveal-microbiome-changes(a313bcd1-2eb3-45d4-af0a-3b0ee4b135cd).html eng eng info:eu-repo/semantics/restrictedAccess Scheel , M , Zervas , A , Jacobsen , C S & Christensen , T R 2022 , ' Erosion of ancient Arctic permafrost: transcriptomics reveal microbiome changes ' , ISME18 2022 , Lausanne , Switzerland , 14/08/2022 - 19/09/2022 . conferenceObject 2022 ftuniaarhuspubl 2023-04-26T22:57:30Z Permafrost soils currently store about twice as much carbon as deposited in the atmosphere, and alone Arctic permafrost is estimated to capture 1850 Gt carbon. As these usually remain frozen in summer, often even for millennia, decomposition rates are low. With global warming though, both the seasonal thaw depth and abrupt thaw event frequencies increase, leading to bioavailability of now thawed soil carbon for remineralisation. Insights about microbial carbon sequestration and ecological cascades of functional groups in thawing permafrost is crucial for our understanding of Arctic greenhouse gas fluxes. In Zackenberg, Northeast Greenland, a thermal erosion valley was samples two years after its abrupt collapse. We used total RNA sequencing to reveal the putatively active community (rRNA) as well as its expressed functional genes (mRNA) present in the up to 26’500-year-old permafrost material. The impact of changing physicochemical soil parameters with depth, such as pH, age, soil moisture and organic matter content was compared to determine possible metabolic and community-level responses. A pronounced RNA/DNA ratio in freshly thawed permafrost layers indicated recently increased gene activity. While strongest driver of community variation was the age of the soil layers, their recent dynamic thaw patterns explained 60-90% of the variation in the dataset. Higher abundance of protozoa in especially one-year old as opposed to recently thawed material highlights the ecological succession of not only important prokaryotic taxa, but also their predators in short time scales. Conference Object Arctic Arctic Global warming Greenland permafrost Zackenberg Aarhus University: Research Arctic Greenland |
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Aarhus University: Research |
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ftuniaarhuspubl |
language |
English |
description |
Permafrost soils currently store about twice as much carbon as deposited in the atmosphere, and alone Arctic permafrost is estimated to capture 1850 Gt carbon. As these usually remain frozen in summer, often even for millennia, decomposition rates are low. With global warming though, both the seasonal thaw depth and abrupt thaw event frequencies increase, leading to bioavailability of now thawed soil carbon for remineralisation. Insights about microbial carbon sequestration and ecological cascades of functional groups in thawing permafrost is crucial for our understanding of Arctic greenhouse gas fluxes. In Zackenberg, Northeast Greenland, a thermal erosion valley was samples two years after its abrupt collapse. We used total RNA sequencing to reveal the putatively active community (rRNA) as well as its expressed functional genes (mRNA) present in the up to 26’500-year-old permafrost material. The impact of changing physicochemical soil parameters with depth, such as pH, age, soil moisture and organic matter content was compared to determine possible metabolic and community-level responses. A pronounced RNA/DNA ratio in freshly thawed permafrost layers indicated recently increased gene activity. While strongest driver of community variation was the age of the soil layers, their recent dynamic thaw patterns explained 60-90% of the variation in the dataset. Higher abundance of protozoa in especially one-year old as opposed to recently thawed material highlights the ecological succession of not only important prokaryotic taxa, but also their predators in short time scales. |
format |
Conference Object |
author |
Scheel, Maria Zervas, Athanasios Jacobsen, Carsten Suhr Christensen, Torben Røjle |
spellingShingle |
Scheel, Maria Zervas, Athanasios Jacobsen, Carsten Suhr Christensen, Torben Røjle Erosion of ancient Arctic permafrost: transcriptomics reveal microbiome changes |
author_facet |
Scheel, Maria Zervas, Athanasios Jacobsen, Carsten Suhr Christensen, Torben Røjle |
author_sort |
Scheel, Maria |
title |
Erosion of ancient Arctic permafrost: transcriptomics reveal microbiome changes |
title_short |
Erosion of ancient Arctic permafrost: transcriptomics reveal microbiome changes |
title_full |
Erosion of ancient Arctic permafrost: transcriptomics reveal microbiome changes |
title_fullStr |
Erosion of ancient Arctic permafrost: transcriptomics reveal microbiome changes |
title_full_unstemmed |
Erosion of ancient Arctic permafrost: transcriptomics reveal microbiome changes |
title_sort |
erosion of ancient arctic permafrost: transcriptomics reveal microbiome changes |
publishDate |
2022 |
url |
https://pure.au.dk/portal/da/publications/erosion-of-ancient-arctic-permafrost-transcriptomics-reveal-microbiome-changes(a313bcd1-2eb3-45d4-af0a-3b0ee4b135cd).html |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Arctic Global warming Greenland permafrost Zackenberg |
genre_facet |
Arctic Arctic Global warming Greenland permafrost Zackenberg |
op_source |
Scheel , M , Zervas , A , Jacobsen , C S & Christensen , T R 2022 , ' Erosion of ancient Arctic permafrost: transcriptomics reveal microbiome changes ' , ISME18 2022 , Lausanne , Switzerland , 14/08/2022 - 19/09/2022 . |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1768380630882582528 |