Use of palmitoleic acid and its oxidation products for monitoring the degradation of ice algae in Arctic waters and bottom sediments
International audience Degradation of palmitoleic acid (C 16:1x7), the main fatty acid component of sea ice-associated (sympagic) diatoms, was monitored in Arctic sea ice at the beginning of ice melting and in the underlying sinking particles and superficial bottom sediments. In sea ice, degradation...
Published in: | Organic Geochemistry |
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Main Authors: | , , , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2018
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Subjects: | |
Online Access: | https://amu.hal.science/hal-02024257 https://amu.hal.science/hal-02024257/document https://amu.hal.science/hal-02024257/file/1-Rontani-3.pdf https://doi.org/10.1016/j.orggeochem.2018.06.002 |
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ftsorbonneuniv:oai:HAL:hal-02024257v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
Palmitoleic acid Sympagic algae Arctic Biotic and abiotic degradation Sea ice Sinking particles Superficial bottom sediments [SDE]Environmental Sciences |
spellingShingle |
Palmitoleic acid Sympagic algae Arctic Biotic and abiotic degradation Sea ice Sinking particles Superficial bottom sediments [SDE]Environmental Sciences Rontani, Jean-Francois Amiraux, Remi Lalande, Catherine Babin, Marcel Kim, Hak-Ryul Belt, Simon Use of palmitoleic acid and its oxidation products for monitoring the degradation of ice algae in Arctic waters and bottom sediments |
topic_facet |
Palmitoleic acid Sympagic algae Arctic Biotic and abiotic degradation Sea ice Sinking particles Superficial bottom sediments [SDE]Environmental Sciences |
description |
International audience Degradation of palmitoleic acid (C 16:1x7), the main fatty acid component of sea ice-associated (sympagic) diatoms, was monitored in Arctic sea ice at the beginning of ice melting and in the underlying sinking particles and superficial bottom sediments. In sea ice, degradation of sympagic algae involved biotic oxidation induced by 10S-DOX-like lipoxygenase of unknown salinity-stressed attached bacteria, while photo-and autoxidation were limited. In the water column, strong hydratase and Z/E isomerase activity were observed. Hydration of unsaturated fatty acids seems to be a detoxification strategy, which is essential for bacterial survival when associated with free fatty acid-rich environments such as ice algae. In contrast, Z/E isomerisation of palmitoleic acid was attributed to the release of Fe 2+ ions during radical-induced damage of the active site of the bacterial 10S-DOX-like lipoxygenase and Z/E isomerases. Due to the poor physiological state of their attached bacteria resulting from salinity stress in brine channels or toxicity of free ice algae fatty acids, sympagic algae appeared to be only very weakly biotically degraded within the water column. In bottom sediments, free radicals resulting from 10S-DOX-like lipoxygenase activity induced a strong autoxidation of the ice algal material. The presence in bottom sediments of a significant proportion of oxidation products resulting from 10S-DOX-like lipoxygenase activity attested to the strong contribution of sea ice-derived OM released during the early stages of ice melt prior to depo-sition in the sediments. However, on the basis of the highest fatty acid photooxidation state observed in these sediments, an additional contribution of highly photooxidized material (ice algal material released at the end of ice melting or open water phytoplankton) seems likely. The degradation of hydroperoxides, resulting from biotic and abiotic degradation of palmitoleic acid, appeared to involve: (i) homolytic cleav-age of the peroxyl group ... |
author2 |
CE 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)-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) 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) Université Laval Québec (ULaval) Takuvik International Research Laboratory Université Laval Québec (ULaval)-Centre National de la Recherche Scientifique (CNRS) Kyungpook National University Daegu (KNU) Biogeochemistry Research Centre (BGC) Plymouth University ANR-14-CE01-0017,Green Edge,Productivité biologique dans l'Océan Arctique: réponse passée, présente et future aux fluctuations climatiques, et impacts sur les flux de carbone, le réseau trophique et les communautés humaines locales(2014) |
format |
Article in Journal/Newspaper |
author |
Rontani, Jean-Francois Amiraux, Remi Lalande, Catherine Babin, Marcel Kim, Hak-Ryul Belt, Simon |
author_facet |
Rontani, Jean-Francois Amiraux, Remi Lalande, Catherine Babin, Marcel Kim, Hak-Ryul Belt, Simon |
author_sort |
Rontani, Jean-Francois |
title |
Use of palmitoleic acid and its oxidation products for monitoring the degradation of ice algae in Arctic waters and bottom sediments |
title_short |
Use of palmitoleic acid and its oxidation products for monitoring the degradation of ice algae in Arctic waters and bottom sediments |
title_full |
Use of palmitoleic acid and its oxidation products for monitoring the degradation of ice algae in Arctic waters and bottom sediments |
title_fullStr |
Use of palmitoleic acid and its oxidation products for monitoring the degradation of ice algae in Arctic waters and bottom sediments |
title_full_unstemmed |
Use of palmitoleic acid and its oxidation products for monitoring the degradation of ice algae in Arctic waters and bottom sediments |
title_sort |
use of palmitoleic acid and its oxidation products for monitoring the degradation of ice algae in arctic waters and bottom sediments |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://amu.hal.science/hal-02024257 https://amu.hal.science/hal-02024257/document https://amu.hal.science/hal-02024257/file/1-Rontani-3.pdf https://doi.org/10.1016/j.orggeochem.2018.06.002 |
genre |
Arctic ice algae Phytoplankton Sea ice |
genre_facet |
Arctic ice algae Phytoplankton Sea ice |
op_source |
ISSN: 0146-6380 Organic Geochemistry https://amu.hal.science/hal-02024257 Organic Geochemistry, 2018, 124, pp.88-102. ⟨10.1016/j.orggeochem.2018.06.002⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.orggeochem.2018.06.002 hal-02024257 https://amu.hal.science/hal-02024257 https://amu.hal.science/hal-02024257/document https://amu.hal.science/hal-02024257/file/1-Rontani-3.pdf doi:10.1016/j.orggeochem.2018.06.002 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.orggeochem.2018.06.002 |
container_title |
Organic Geochemistry |
container_volume |
124 |
container_start_page |
88 |
op_container_end_page |
102 |
_version_ |
1786823118577205248 |
spelling |
ftsorbonneuniv:oai:HAL:hal-02024257v1 2023-12-31T10:03:34+01:00 Use of palmitoleic acid and its oxidation products for monitoring the degradation of ice algae in Arctic waters and bottom sediments Rontani, Jean-Francois Amiraux, Remi Lalande, Catherine Babin, Marcel Kim, Hak-Ryul Belt, Simon CE 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)-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) 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) Université Laval Québec (ULaval) Takuvik International Research Laboratory Université Laval Québec (ULaval)-Centre National de la Recherche Scientifique (CNRS) Kyungpook National University Daegu (KNU) Biogeochemistry Research Centre (BGC) Plymouth University ANR-14-CE01-0017,Green Edge,Productivité biologique dans l'Océan Arctique: réponse passée, présente et future aux fluctuations climatiques, et impacts sur les flux de carbone, le réseau trophique et les communautés humaines locales(2014) 2018-10 https://amu.hal.science/hal-02024257 https://amu.hal.science/hal-02024257/document https://amu.hal.science/hal-02024257/file/1-Rontani-3.pdf https://doi.org/10.1016/j.orggeochem.2018.06.002 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.orggeochem.2018.06.002 hal-02024257 https://amu.hal.science/hal-02024257 https://amu.hal.science/hal-02024257/document https://amu.hal.science/hal-02024257/file/1-Rontani-3.pdf doi:10.1016/j.orggeochem.2018.06.002 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0146-6380 Organic Geochemistry https://amu.hal.science/hal-02024257 Organic Geochemistry, 2018, 124, pp.88-102. ⟨10.1016/j.orggeochem.2018.06.002⟩ Palmitoleic acid Sympagic algae Arctic Biotic and abiotic degradation Sea ice Sinking particles Superficial bottom sediments [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2018 ftsorbonneuniv https://doi.org/10.1016/j.orggeochem.2018.06.002 2023-12-05T23:41:31Z International audience Degradation of palmitoleic acid (C 16:1x7), the main fatty acid component of sea ice-associated (sympagic) diatoms, was monitored in Arctic sea ice at the beginning of ice melting and in the underlying sinking particles and superficial bottom sediments. In sea ice, degradation of sympagic algae involved biotic oxidation induced by 10S-DOX-like lipoxygenase of unknown salinity-stressed attached bacteria, while photo-and autoxidation were limited. In the water column, strong hydratase and Z/E isomerase activity were observed. Hydration of unsaturated fatty acids seems to be a detoxification strategy, which is essential for bacterial survival when associated with free fatty acid-rich environments such as ice algae. In contrast, Z/E isomerisation of palmitoleic acid was attributed to the release of Fe 2+ ions during radical-induced damage of the active site of the bacterial 10S-DOX-like lipoxygenase and Z/E isomerases. Due to the poor physiological state of their attached bacteria resulting from salinity stress in brine channels or toxicity of free ice algae fatty acids, sympagic algae appeared to be only very weakly biotically degraded within the water column. In bottom sediments, free radicals resulting from 10S-DOX-like lipoxygenase activity induced a strong autoxidation of the ice algal material. The presence in bottom sediments of a significant proportion of oxidation products resulting from 10S-DOX-like lipoxygenase activity attested to the strong contribution of sea ice-derived OM released during the early stages of ice melt prior to depo-sition in the sediments. However, on the basis of the highest fatty acid photooxidation state observed in these sediments, an additional contribution of highly photooxidized material (ice algal material released at the end of ice melting or open water phytoplankton) seems likely. The degradation of hydroperoxides, resulting from biotic and abiotic degradation of palmitoleic acid, appeared to involve: (i) homolytic cleav-age of the peroxyl group ... Article in Journal/Newspaper Arctic ice algae Phytoplankton Sea ice HAL Sorbonne Université Organic Geochemistry 124 88 102 |