Bacterial diversity and lipid biomarkers in sea ice and sinking particulate organic material during the melt season in the Canadian Arctic
International audience The estimation of important carbon fluxes in a changing Arctic environment remains a challenge, one that could benefit from the development of biomarkers that distinguish between sympagic (ice-associated) and pelagic organic material. Products of 10S-DOX-like lipoxygenase and...
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ftccsdartic:oai:HAL:hal-03458293v1 2023-05-15T14:54:41+02:00 Bacterial diversity and lipid biomarkers in sea ice and sinking particulate organic material during the melt season in the Canadian Arctic Amiraux, Rémi Rontani, Jean-François Armougom, Fabrice Frouin, Eléonore Babin, Marcel Artigue, Lise Bonin, Patricia Takuvik International Research Laboratory Université Laval Québec (ULaval)-Centre National de la Recherche Scientifique (CNRS) 2021-03-15 https://hal.archives-ouvertes.fr/hal-03458293 https://doi.org/10.1525/elementa.2019.040 en eng HAL CCSD University of California Press info:eu-repo/semantics/altIdentifier/doi/10.1525/elementa.2019.040 hal-03458293 https://hal.archives-ouvertes.fr/hal-03458293 doi:10.1525/elementa.2019.040 EISSN: 2325-1026 Elementa: Science of the Anthropocene https://hal.archives-ouvertes.fr/hal-03458293 Elementa: Science of the Anthropocene, University of California Press, 2021, 9 (1), ⟨10.1525/elementa.2019.040⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2021 ftccsdartic https://doi.org/10.1525/elementa.2019.040 2021-12-04T23:25:34Z International audience The estimation of important carbon fluxes in a changing Arctic environment remains a challenge, one that could benefit from the development of biomarkers that distinguish between sympagic (ice-associated) and pelagic organic material. Products of 10S-DOX-like lipoxygenase and fatty acid cis-trans isomerase (CTI) activity of bacteria attached to sympagic particulate organic matter (POM) were proposed previously as potential biomarkers of the contribution of sympagic biota to carbon fluxes to the seafloor. To date, neither the bacteria involved in such enzymatic activities nor the detection of these potential biomarkers at their presumed source (i.e., sea ice) has been investigated. Here, we determined and compared the diversity of prokaryotic communities (based on operational taxonomic units) attached to sea ice POM and under-ice sinking particles during an early stage of ice melt (brine drainage) in Baffin Bay (Canadian Arctic). Based on a time series of biodiversity analyses and the quantification of lipid tracers of these two bacterial enzymatic activities, we suggest that CTI-active bacteria, exposed to hypersaline stress, are attached to algal POM just above bottom sea ice and released into the water column following brine drainage. In contrast, bacteria attached to sinking particles and exhibiting 10S-DOX-like lipoxygenase activity are suggested to come from the bottommost layer of sea ice, where they may play a role in the detoxification of algae-produce free fatty acids. These results provide a refined view of the potential use of products of CTI activity as specific biomarkers of sympagic organic matter. Article in Journal/Newspaper Arctic Baffin Bay Baffin Bay Baffin Sea ice Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Baffin Bay Elementa: Science of the Anthropocene 9 1 |
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 Amiraux, Rémi Rontani, Jean-François Armougom, Fabrice Frouin, Eléonore Babin, Marcel Artigue, Lise Bonin, Patricia Bacterial diversity and lipid biomarkers in sea ice and sinking particulate organic material during the melt season in the Canadian Arctic |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience The estimation of important carbon fluxes in a changing Arctic environment remains a challenge, one that could benefit from the development of biomarkers that distinguish between sympagic (ice-associated) and pelagic organic material. Products of 10S-DOX-like lipoxygenase and fatty acid cis-trans isomerase (CTI) activity of bacteria attached to sympagic particulate organic matter (POM) were proposed previously as potential biomarkers of the contribution of sympagic biota to carbon fluxes to the seafloor. To date, neither the bacteria involved in such enzymatic activities nor the detection of these potential biomarkers at their presumed source (i.e., sea ice) has been investigated. Here, we determined and compared the diversity of prokaryotic communities (based on operational taxonomic units) attached to sea ice POM and under-ice sinking particles during an early stage of ice melt (brine drainage) in Baffin Bay (Canadian Arctic). Based on a time series of biodiversity analyses and the quantification of lipid tracers of these two bacterial enzymatic activities, we suggest that CTI-active bacteria, exposed to hypersaline stress, are attached to algal POM just above bottom sea ice and released into the water column following brine drainage. In contrast, bacteria attached to sinking particles and exhibiting 10S-DOX-like lipoxygenase activity are suggested to come from the bottommost layer of sea ice, where they may play a role in the detoxification of algae-produce free fatty acids. These results provide a refined view of the potential use of products of CTI activity as specific biomarkers of sympagic organic matter. |
author2 |
Takuvik International Research Laboratory Université Laval Québec (ULaval)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Amiraux, Rémi Rontani, Jean-François Armougom, Fabrice Frouin, Eléonore Babin, Marcel Artigue, Lise Bonin, Patricia |
author_facet |
Amiraux, Rémi Rontani, Jean-François Armougom, Fabrice Frouin, Eléonore Babin, Marcel Artigue, Lise Bonin, Patricia |
author_sort |
Amiraux, Rémi |
title |
Bacterial diversity and lipid biomarkers in sea ice and sinking particulate organic material during the melt season in the Canadian Arctic |
title_short |
Bacterial diversity and lipid biomarkers in sea ice and sinking particulate organic material during the melt season in the Canadian Arctic |
title_full |
Bacterial diversity and lipid biomarkers in sea ice and sinking particulate organic material during the melt season in the Canadian Arctic |
title_fullStr |
Bacterial diversity and lipid biomarkers in sea ice and sinking particulate organic material during the melt season in the Canadian Arctic |
title_full_unstemmed |
Bacterial diversity and lipid biomarkers in sea ice and sinking particulate organic material during the melt season in the Canadian Arctic |
title_sort |
bacterial diversity and lipid biomarkers in sea ice and sinking particulate organic material during the melt season in the canadian arctic |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.archives-ouvertes.fr/hal-03458293 https://doi.org/10.1525/elementa.2019.040 |
geographic |
Arctic Baffin Bay |
geographic_facet |
Arctic Baffin Bay |
genre |
Arctic Baffin Bay Baffin Bay Baffin Sea ice |
genre_facet |
Arctic Baffin Bay Baffin Bay Baffin Sea ice |
op_source |
EISSN: 2325-1026 Elementa: Science of the Anthropocene https://hal.archives-ouvertes.fr/hal-03458293 Elementa: Science of the Anthropocene, University of California Press, 2021, 9 (1), ⟨10.1525/elementa.2019.040⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1525/elementa.2019.040 hal-03458293 https://hal.archives-ouvertes.fr/hal-03458293 doi:10.1525/elementa.2019.040 |
op_doi |
https://doi.org/10.1525/elementa.2019.040 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
9 |
container_issue |
1 |
_version_ |
1766326450633310208 |