Seasonal shifts of microbial methane oxidation in Arctic shelf waters above gas seeps
International audience The Arctic Ocean subseabed holds vast reservoirs of the potent greenhouse gas methane (CH 4), often seeping into the ocean water column. In a continuously warming ocean as a result of climate change an increase of CH 4 seepage from the seabed is hypothesized. Today, CH 4 is la...
Published in: | Limnology and Oceanography |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://hal.archives-ouvertes.fr/hal-03333760 https://hal.archives-ouvertes.fr/hal-03333760/document https://hal.archives-ouvertes.fr/hal-03333760/file/lno.11731.pdf https://doi.org/10.1002/lno.11731 |
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ftccsdartic:oai:HAL:hal-03333760v1 2023-05-15T15:00:48+02:00 Seasonal shifts of microbial methane oxidation in Arctic shelf waters above gas seeps Gründger, Friederike Probandt, David Knittel, Katrin Carrier, Vincent Kalenitchenko, Dimitri Silyakova, Anna Serov, Pavel Ferré, Bénédicte Svenning, Mette, Niemann, Helge The Arctic University of Norway (UiT) 2021-04-07 https://hal.archives-ouvertes.fr/hal-03333760 https://hal.archives-ouvertes.fr/hal-03333760/document https://hal.archives-ouvertes.fr/hal-03333760/file/lno.11731.pdf https://doi.org/10.1002/lno.11731 en eng HAL CCSD Association for the Sciences of Limnology and Oceanography info:eu-repo/semantics/altIdentifier/doi/10.1002/lno.11731 hal-03333760 https://hal.archives-ouvertes.fr/hal-03333760 https://hal.archives-ouvertes.fr/hal-03333760/document https://hal.archives-ouvertes.fr/hal-03333760/file/lno.11731.pdf doi:10.1002/lno.11731 info:eu-repo/semantics/OpenAccess ISSN: 0024-3590 EISSN: 1939-5590 Limnology and Oceanography https://hal.archives-ouvertes.fr/hal-03333760 Limnology and Oceanography, Association for the Sciences of Limnology and Oceanography, 2021, 66, pp.1896 - 1914. ⟨10.1002/lno.11731⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2021 ftccsdartic https://doi.org/10.1002/lno.11731 2021-11-20T23:50:18Z International audience The Arctic Ocean subseabed holds vast reservoirs of the potent greenhouse gas methane (CH 4), often seeping into the ocean water column. In a continuously warming ocean as a result of climate change an increase of CH 4 seepage from the seabed is hypothesized. Today, CH 4 is largely retained in the water column due to the activity of methane-oxidizing bacteria (MOB) that thrive there. Predicted future oceanographic changes, bottom water warming and increasing CH 4 release may alter efficacy of this microbially mediated CH 4 sink. Here we investigate the composition and principle controls on abundance and activity of the MOB communities at the shallow continental shelf west of Svalbard, which is subject to strong seasonal changes in oceanographic conditions. Covering a large area (364 km 2), we measured vertical distribution of microbial methane oxidation (MOx) rates, MOB community composition, dissolved CH 4 concentrations, temperature and salinity four times throughout spring and summer during three consecutive years. Sequencing analyses of the pmoA gene revealed a small, relatively uniform community mainly composed of type-Ia methanotrophs (deep-sea 3 clade). We found highest MOx rates (7 nM d −1) in summer in bathymetric depressions filled with stagnant Atlantic Water containing moderate concentrations of dissolved CH 4 (< 100 nM). MOx rates in these depressions during spring were much lower (< 0.5 nM d −1) due to lower temperatures and mixing of Transformed Atlantic Water flushing MOB with the Atlantic Water out of the depressions. Our results show that MOB and MOx in CH 4-rich bottom waters are highly affected by geomorphology and seasonal conditions. Article in Journal/Newspaper Arctic Arctic Ocean Climate change Svalbard Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Arctic Ocean Svalbard Limnology and Oceanography 66 5 1896 1914 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Gründger, Friederike Probandt, David Knittel, Katrin Carrier, Vincent Kalenitchenko, Dimitri Silyakova, Anna Serov, Pavel Ferré, Bénédicte Svenning, Mette, Niemann, Helge Seasonal shifts of microbial methane oxidation in Arctic shelf waters above gas seeps |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience The Arctic Ocean subseabed holds vast reservoirs of the potent greenhouse gas methane (CH 4), often seeping into the ocean water column. In a continuously warming ocean as a result of climate change an increase of CH 4 seepage from the seabed is hypothesized. Today, CH 4 is largely retained in the water column due to the activity of methane-oxidizing bacteria (MOB) that thrive there. Predicted future oceanographic changes, bottom water warming and increasing CH 4 release may alter efficacy of this microbially mediated CH 4 sink. Here we investigate the composition and principle controls on abundance and activity of the MOB communities at the shallow continental shelf west of Svalbard, which is subject to strong seasonal changes in oceanographic conditions. Covering a large area (364 km 2), we measured vertical distribution of microbial methane oxidation (MOx) rates, MOB community composition, dissolved CH 4 concentrations, temperature and salinity four times throughout spring and summer during three consecutive years. Sequencing analyses of the pmoA gene revealed a small, relatively uniform community mainly composed of type-Ia methanotrophs (deep-sea 3 clade). We found highest MOx rates (7 nM d −1) in summer in bathymetric depressions filled with stagnant Atlantic Water containing moderate concentrations of dissolved CH 4 (< 100 nM). MOx rates in these depressions during spring were much lower (< 0.5 nM d −1) due to lower temperatures and mixing of Transformed Atlantic Water flushing MOB with the Atlantic Water out of the depressions. Our results show that MOB and MOx in CH 4-rich bottom waters are highly affected by geomorphology and seasonal conditions. |
author2 |
The Arctic University of Norway (UiT) |
format |
Article in Journal/Newspaper |
author |
Gründger, Friederike Probandt, David Knittel, Katrin Carrier, Vincent Kalenitchenko, Dimitri Silyakova, Anna Serov, Pavel Ferré, Bénédicte Svenning, Mette, Niemann, Helge |
author_facet |
Gründger, Friederike Probandt, David Knittel, Katrin Carrier, Vincent Kalenitchenko, Dimitri Silyakova, Anna Serov, Pavel Ferré, Bénédicte Svenning, Mette, Niemann, Helge |
author_sort |
Gründger, Friederike |
title |
Seasonal shifts of microbial methane oxidation in Arctic shelf waters above gas seeps |
title_short |
Seasonal shifts of microbial methane oxidation in Arctic shelf waters above gas seeps |
title_full |
Seasonal shifts of microbial methane oxidation in Arctic shelf waters above gas seeps |
title_fullStr |
Seasonal shifts of microbial methane oxidation in Arctic shelf waters above gas seeps |
title_full_unstemmed |
Seasonal shifts of microbial methane oxidation in Arctic shelf waters above gas seeps |
title_sort |
seasonal shifts of microbial methane oxidation in arctic shelf waters above gas seeps |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.archives-ouvertes.fr/hal-03333760 https://hal.archives-ouvertes.fr/hal-03333760/document https://hal.archives-ouvertes.fr/hal-03333760/file/lno.11731.pdf https://doi.org/10.1002/lno.11731 |
geographic |
Arctic Arctic Ocean Svalbard |
geographic_facet |
Arctic Arctic Ocean Svalbard |
genre |
Arctic Arctic Ocean Climate change Svalbard |
genre_facet |
Arctic Arctic Ocean Climate change Svalbard |
op_source |
ISSN: 0024-3590 EISSN: 1939-5590 Limnology and Oceanography https://hal.archives-ouvertes.fr/hal-03333760 Limnology and Oceanography, Association for the Sciences of Limnology and Oceanography, 2021, 66, pp.1896 - 1914. ⟨10.1002/lno.11731⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/lno.11731 hal-03333760 https://hal.archives-ouvertes.fr/hal-03333760 https://hal.archives-ouvertes.fr/hal-03333760/document https://hal.archives-ouvertes.fr/hal-03333760/file/lno.11731.pdf doi:10.1002/lno.11731 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/lno.11731 |
container_title |
Limnology and Oceanography |
container_volume |
66 |
container_issue |
5 |
container_start_page |
1896 |
op_container_end_page |
1914 |
_version_ |
1766332870410895360 |