Monitoring abiotic degradation in sinking versus suspended Arctic sea ice algae during a spring ice melt using specific lipid oxidation tracers
International audience The abiotic degradation state of sea ice algae released during a late spring ice melt process was determined by sampling the underlying waters and measuring certain well-known algal lipids and their oxidation products, including those derived from epi-brassicasterol, 24-methyl...
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Online Access: | https://hal.science/hal-01438757 https://doi.org/10.1016/j.orggeochem.2016.05.016 |
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ftunivaixmarseil:oai:HAL:hal-01438757v1 2023-12-31T10:03:46+01:00 Monitoring abiotic degradation in sinking versus suspended Arctic sea ice algae during a spring ice melt using specific lipid oxidation tracers Rontani, Jean-Francois Belt, Simon T. Brown, Thomas A. Amiraux, Remi Gosselin, Michel Vaultier, Frederic Mundy, Christopher J. Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) 2016-08 https://hal.science/hal-01438757 https://doi.org/10.1016/j.orggeochem.2016.05.016 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.orggeochem.2016.05.016 hal-01438757 https://hal.science/hal-01438757 doi:10.1016/j.orggeochem.2016.05.016 ISSN: 0146-6380 Organic Geochemistry https://hal.science/hal-01438757 Organic Geochemistry, 2016, 98, pp.82-97. ⟨10.1016/j.orggeochem.2016.05.016⟩ Sea ice algae Suspended and sinking particles Lipid oxidation products Photooxidation Preservation Aggregation [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2016 ftunivaixmarseil https://doi.org/10.1016/j.orggeochem.2016.05.016 2023-12-05T23:45:19Z International audience The abiotic degradation state of sea ice algae released during a late spring ice melt process was determined by sampling the underlying waters and measuring certain well-known algal lipids and their oxidation products, including those derived from epi-brassicasterol, 24-methylenecholesterol, palmitoleic acid and the phytyl side-chain of chlorophyll. More specifically, parent lipids and some of their oxidation products were quantified in suspended (collected by filtration) and sinking (collected with sediment traps at 5 and 30 m) particles from Resolute Passage (Canada) during a period of spring ice melt in 2012 and the outcomes compared with those obtained from related sea ice samples analyzed previously. Our data show that suspended cells in the near surface waters appeared to be only very weakly affected by photooxidative processes, likely indicative of a community of unaggregated living cells with high seeding potential for further growth. In contrast, we attribute the strong photooxidation state of the organic matter in the sediment traps deployed at 5 m to the presence of senescent and somewhat aggregated sea ice algae that descended only relatively slowly within the euphotic zone, and was thus susceptible to photochemical degradation. On the other hand, the increased abiotic preservation of the sinking material collected in the sediment traps deployed at 30 m, likely reflected more highly aggregated senescent sea ice algae that settled sufficiently rapidly out of the euphotic zone to avoid significant photooxidation. This better-preserved sinking material in the deeper sediment traps may therefore contribute more strongly to the underlying sediments. A three-component conceptual scheme summarizing the abiotic behavior of Arctic sea ice algae in underlying waters is proposed Article in Journal/Newspaper Arctic ice algae Sea ice Aix-Marseille Université: HAL Organic Geochemistry 98 82 97 |
institution |
Open Polar |
collection |
Aix-Marseille Université: HAL |
op_collection_id |
ftunivaixmarseil |
language |
English |
topic |
Sea ice algae Suspended and sinking particles Lipid oxidation products Photooxidation Preservation Aggregation [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
Sea ice algae Suspended and sinking particles Lipid oxidation products Photooxidation Preservation Aggregation [SDE.MCG]Environmental Sciences/Global Changes Rontani, Jean-Francois Belt, Simon T. Brown, Thomas A. Amiraux, Remi Gosselin, Michel Vaultier, Frederic Mundy, Christopher J. Monitoring abiotic degradation in sinking versus suspended Arctic sea ice algae during a spring ice melt using specific lipid oxidation tracers |
topic_facet |
Sea ice algae Suspended and sinking particles Lipid oxidation products Photooxidation Preservation Aggregation [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience The abiotic degradation state of sea ice algae released during a late spring ice melt process was determined by sampling the underlying waters and measuring certain well-known algal lipids and their oxidation products, including those derived from epi-brassicasterol, 24-methylenecholesterol, palmitoleic acid and the phytyl side-chain of chlorophyll. More specifically, parent lipids and some of their oxidation products were quantified in suspended (collected by filtration) and sinking (collected with sediment traps at 5 and 30 m) particles from Resolute Passage (Canada) during a period of spring ice melt in 2012 and the outcomes compared with those obtained from related sea ice samples analyzed previously. Our data show that suspended cells in the near surface waters appeared to be only very weakly affected by photooxidative processes, likely indicative of a community of unaggregated living cells with high seeding potential for further growth. In contrast, we attribute the strong photooxidation state of the organic matter in the sediment traps deployed at 5 m to the presence of senescent and somewhat aggregated sea ice algae that descended only relatively slowly within the euphotic zone, and was thus susceptible to photochemical degradation. On the other hand, the increased abiotic preservation of the sinking material collected in the sediment traps deployed at 30 m, likely reflected more highly aggregated senescent sea ice algae that settled sufficiently rapidly out of the euphotic zone to avoid significant photooxidation. This better-preserved sinking material in the deeper sediment traps may therefore contribute more strongly to the underlying sediments. A three-component conceptual scheme summarizing the abiotic behavior of Arctic sea ice algae in underlying waters is proposed |
author2 |
Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Rontani, Jean-Francois Belt, Simon T. Brown, Thomas A. Amiraux, Remi Gosselin, Michel Vaultier, Frederic Mundy, Christopher J. |
author_facet |
Rontani, Jean-Francois Belt, Simon T. Brown, Thomas A. Amiraux, Remi Gosselin, Michel Vaultier, Frederic Mundy, Christopher J. |
author_sort |
Rontani, Jean-Francois |
title |
Monitoring abiotic degradation in sinking versus suspended Arctic sea ice algae during a spring ice melt using specific lipid oxidation tracers |
title_short |
Monitoring abiotic degradation in sinking versus suspended Arctic sea ice algae during a spring ice melt using specific lipid oxidation tracers |
title_full |
Monitoring abiotic degradation in sinking versus suspended Arctic sea ice algae during a spring ice melt using specific lipid oxidation tracers |
title_fullStr |
Monitoring abiotic degradation in sinking versus suspended Arctic sea ice algae during a spring ice melt using specific lipid oxidation tracers |
title_full_unstemmed |
Monitoring abiotic degradation in sinking versus suspended Arctic sea ice algae during a spring ice melt using specific lipid oxidation tracers |
title_sort |
monitoring abiotic degradation in sinking versus suspended arctic sea ice algae during a spring ice melt using specific lipid oxidation tracers |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-01438757 https://doi.org/10.1016/j.orggeochem.2016.05.016 |
genre |
Arctic ice algae Sea ice |
genre_facet |
Arctic ice algae Sea ice |
op_source |
ISSN: 0146-6380 Organic Geochemistry https://hal.science/hal-01438757 Organic Geochemistry, 2016, 98, pp.82-97. ⟨10.1016/j.orggeochem.2016.05.016⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.orggeochem.2016.05.016 hal-01438757 https://hal.science/hal-01438757 doi:10.1016/j.orggeochem.2016.05.016 |
op_doi |
https://doi.org/10.1016/j.orggeochem.2016.05.016 |
container_title |
Organic Geochemistry |
container_volume |
98 |
container_start_page |
82 |
op_container_end_page |
97 |
_version_ |
1786825463744692224 |