Ontogenic succession of thermokarst thaw ponds is linked to dissolved organic matter quality and microbial degradation potential
Abstract Warming climate is thawing the permafrost in arctic and subarctic regions, leading to formation of thermokarst ponds. During the formation and geomorphological succession of these ponds, carbon that has been trapped in frozen soils for thousands of years is hydrologically mobilized and retu...
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Online Access: | http://dx.doi.org/10.1002/lno.11349 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.11349 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11349 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11349 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11349 |
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crwiley:10.1002/lno.11349 2024-09-15T18:29:58+00:00 Ontogenic succession of thermokarst thaw ponds is linked to dissolved organic matter quality and microbial degradation potential Peura, Sari Wauthy, Maxime Simone, Domenico Eiler, Alexander Einarsdóttir, Karólína Rautio, Milla Bertilsson, Stefan Knut och Alice Wallenbergs Stiftelse Natural Sciences and Engineering Research Council of Canada Academy of Finland Vetenskapsrådet 2019 http://dx.doi.org/10.1002/lno.11349 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.11349 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11349 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11349 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11349 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Limnology and Oceanography volume 65, issue S1 ISSN 0024-3590 1939-5590 journal-article 2019 crwiley https://doi.org/10.1002/lno.11349 2024-07-23T04:10:24Z Abstract Warming climate is thawing the permafrost in arctic and subarctic regions, leading to formation of thermokarst ponds. During the formation and geomorphological succession of these ponds, carbon that has been trapped in frozen soils for thousands of years is hydrologically mobilized and returned to the active carbon cycle. We sampled 12 thermokarst ponds representing three different stages of pond succession to study the potential of microbial communities to metabolize the organic carbon in the water. We investigated the quality of the dissolved organic carbon (DOC) in the water column based on the spectrophotometric and fluorometric properties of the chromophoric dissolved organic matter combined with parallel factor analysis and the potential of the microbial community for degrading these carbon compounds based on genetic markers related to carbon degradation. Our analysis showed a clear difference in the DOC quality across the different developmental stages. In the younger ponds, organic matter quality suggested that it was originating from the degrading permafrost and in the metagenomes collected from these ponds, the normalized abundance of genes related to degradation of carbon compounds was higher. There was also a shift in the degradation potential in the water column of the ponds, with higher potential for organic matter degradation in deeper, anoxic layers. In conclusion, our results show that the DOC quality and the genetic potential of the microbial community for carbon cycling change across the pond ontogeny, suggesting a capacity of the microbial communities to adapt to changing environmental conditions. Article in Journal/Newspaper permafrost Subarctic Thermokarst Wiley Online Library Limnology and Oceanography 65 S1 |
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English |
description |
Abstract Warming climate is thawing the permafrost in arctic and subarctic regions, leading to formation of thermokarst ponds. During the formation and geomorphological succession of these ponds, carbon that has been trapped in frozen soils for thousands of years is hydrologically mobilized and returned to the active carbon cycle. We sampled 12 thermokarst ponds representing three different stages of pond succession to study the potential of microbial communities to metabolize the organic carbon in the water. We investigated the quality of the dissolved organic carbon (DOC) in the water column based on the spectrophotometric and fluorometric properties of the chromophoric dissolved organic matter combined with parallel factor analysis and the potential of the microbial community for degrading these carbon compounds based on genetic markers related to carbon degradation. Our analysis showed a clear difference in the DOC quality across the different developmental stages. In the younger ponds, organic matter quality suggested that it was originating from the degrading permafrost and in the metagenomes collected from these ponds, the normalized abundance of genes related to degradation of carbon compounds was higher. There was also a shift in the degradation potential in the water column of the ponds, with higher potential for organic matter degradation in deeper, anoxic layers. In conclusion, our results show that the DOC quality and the genetic potential of the microbial community for carbon cycling change across the pond ontogeny, suggesting a capacity of the microbial communities to adapt to changing environmental conditions. |
author2 |
Knut och Alice Wallenbergs Stiftelse Natural Sciences and Engineering Research Council of Canada Academy of Finland Vetenskapsrådet |
format |
Article in Journal/Newspaper |
author |
Peura, Sari Wauthy, Maxime Simone, Domenico Eiler, Alexander Einarsdóttir, Karólína Rautio, Milla Bertilsson, Stefan |
spellingShingle |
Peura, Sari Wauthy, Maxime Simone, Domenico Eiler, Alexander Einarsdóttir, Karólína Rautio, Milla Bertilsson, Stefan Ontogenic succession of thermokarst thaw ponds is linked to dissolved organic matter quality and microbial degradation potential |
author_facet |
Peura, Sari Wauthy, Maxime Simone, Domenico Eiler, Alexander Einarsdóttir, Karólína Rautio, Milla Bertilsson, Stefan |
author_sort |
Peura, Sari |
title |
Ontogenic succession of thermokarst thaw ponds is linked to dissolved organic matter quality and microbial degradation potential |
title_short |
Ontogenic succession of thermokarst thaw ponds is linked to dissolved organic matter quality and microbial degradation potential |
title_full |
Ontogenic succession of thermokarst thaw ponds is linked to dissolved organic matter quality and microbial degradation potential |
title_fullStr |
Ontogenic succession of thermokarst thaw ponds is linked to dissolved organic matter quality and microbial degradation potential |
title_full_unstemmed |
Ontogenic succession of thermokarst thaw ponds is linked to dissolved organic matter quality and microbial degradation potential |
title_sort |
ontogenic succession of thermokarst thaw ponds is linked to dissolved organic matter quality and microbial degradation potential |
publisher |
Wiley |
publishDate |
2019 |
url |
http://dx.doi.org/10.1002/lno.11349 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.11349 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11349 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11349 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11349 |
genre |
permafrost Subarctic Thermokarst |
genre_facet |
permafrost Subarctic Thermokarst |
op_source |
Limnology and Oceanography volume 65, issue S1 ISSN 0024-3590 1939-5590 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/lno.11349 |
container_title |
Limnology and Oceanography |
container_volume |
65 |
container_issue |
S1 |
_version_ |
1810471453378740224 |