Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean)
International audience The lipid content of seven samples of sinking particles collected with sediment traps moored at ∼ 100 m depth in summer and fall across the Canadian Beaufort Shelf (Arc-tic Ocean) was investigated. Our main goal was to quantify and characterize the biotic and abiotic degradati...
Published in: | Biogeosciences |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://amu.hal.science/hal-02051678 https://amu.hal.science/hal-02051678/document https://amu.hal.science/hal-02051678/file/bg-9-4787-2012.pdf https://doi.org/10.5194/bg-9-4787-2012 |
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ftunivaixmarseil:oai:HAL:hal-02051678v1 2023-12-31T10:03:37+01:00 Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean) Rontani, J.-F. Charrière, B. Forest, A. Heussner, S. Vaultier, F. Petit, Morgan Delsaut, N. Fortier, L. Sempere, Richard 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) Centre de Formation et de Recherche sur les Environnements Méditérranéens (CEFREM) Université de Perpignan Via Domitia (UPVD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Université Laval Québec (ULaval) ANR-08-BLAN-0308,Malina,How changes in ice cover, permafrost and UV radiation impact on biodiversity and biogeochemical fluxes in the Arctic Ocean(2008) 2012 https://amu.hal.science/hal-02051678 https://amu.hal.science/hal-02051678/document https://amu.hal.science/hal-02051678/file/bg-9-4787-2012.pdf https://doi.org/10.5194/bg-9-4787-2012 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-9-4787-2012 hal-02051678 https://amu.hal.science/hal-02051678 https://amu.hal.science/hal-02051678/document https://amu.hal.science/hal-02051678/file/bg-9-4787-2012.pdf doi:10.5194/bg-9-4787-2012 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://amu.hal.science/hal-02051678 Biogeosciences, 2012, 9 (11), pp.4787-4802. ⟨10.5194/bg-9-4787-2012⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2012 ftunivaixmarseil https://doi.org/10.5194/bg-9-4787-2012 2023-12-05T23:40:03Z International audience The lipid content of seven samples of sinking particles collected with sediment traps moored at ∼ 100 m depth in summer and fall across the Canadian Beaufort Shelf (Arc-tic Ocean) was investigated. Our main goal was to quantify and characterize the biotic and abiotic degradation processes that acted on sinking material during these periods. Diatoms, which dominated the phytoplanktonic assemblage in every trap sample, appeared to be remarkably sensitive to Type II (i.e. involving singlet oxygen) photodegradation processes in summer, but seemed to be relatively unaffected by biotic degradation at the same time. Hence, the relative recalcitrance of phytodetritus towards biodegradation processes during the Arctic midnight sun period was attributed to the strong photodegradation state of heterotrophic bacteria , which likely resulted from the efficient transfer of singlet oxygen from photodegraded phytoplanktonic cells to attached bacteria. In addition, the detection in trap samples of photoproducts specific to wax ester components found in her-bivorous copepods demonstrated that zooplanktonic faecal material exported out of the euphotic zone in summer were affected by Type II photodegradation processes as well. By contrast, sinking particles collected during the autumn were not influenced by any light-driven stress. Further chemical analyses showed that photodegraded sinking particles contained an important amount of intact hydroperoxides, which could then induce a strong oxidative stress in underlying sediments . Article in Journal/Newspaper Arctic Arctic Ocean Copepods midnight sun Aix-Marseille Université: HAL Biogeosciences 9 11 4787 4802 |
institution |
Open Polar |
collection |
Aix-Marseille Université: HAL |
op_collection_id |
ftunivaixmarseil |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Rontani, J.-F. Charrière, B. Forest, A. Heussner, S. Vaultier, F. Petit, Morgan Delsaut, N. Fortier, L. Sempere, Richard Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean) |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience The lipid content of seven samples of sinking particles collected with sediment traps moored at ∼ 100 m depth in summer and fall across the Canadian Beaufort Shelf (Arc-tic Ocean) was investigated. Our main goal was to quantify and characterize the biotic and abiotic degradation processes that acted on sinking material during these periods. Diatoms, which dominated the phytoplanktonic assemblage in every trap sample, appeared to be remarkably sensitive to Type II (i.e. involving singlet oxygen) photodegradation processes in summer, but seemed to be relatively unaffected by biotic degradation at the same time. Hence, the relative recalcitrance of phytodetritus towards biodegradation processes during the Arctic midnight sun period was attributed to the strong photodegradation state of heterotrophic bacteria , which likely resulted from the efficient transfer of singlet oxygen from photodegraded phytoplanktonic cells to attached bacteria. In addition, the detection in trap samples of photoproducts specific to wax ester components found in her-bivorous copepods demonstrated that zooplanktonic faecal material exported out of the euphotic zone in summer were affected by Type II photodegradation processes as well. By contrast, sinking particles collected during the autumn were not influenced by any light-driven stress. Further chemical analyses showed that photodegraded sinking particles contained an important amount of intact hydroperoxides, which could then induce a strong oxidative stress in underlying sediments . |
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) Centre de Formation et de Recherche sur les Environnements Méditérranéens (CEFREM) Université de Perpignan Via Domitia (UPVD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Université Laval Québec (ULaval) ANR-08-BLAN-0308,Malina,How changes in ice cover, permafrost and UV radiation impact on biodiversity and biogeochemical fluxes in the Arctic Ocean(2008) |
format |
Article in Journal/Newspaper |
author |
Rontani, J.-F. Charrière, B. Forest, A. Heussner, S. Vaultier, F. Petit, Morgan Delsaut, N. Fortier, L. Sempere, Richard |
author_facet |
Rontani, J.-F. Charrière, B. Forest, A. Heussner, S. Vaultier, F. Petit, Morgan Delsaut, N. Fortier, L. Sempere, Richard |
author_sort |
Rontani, J.-F. |
title |
Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean) |
title_short |
Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean) |
title_full |
Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean) |
title_fullStr |
Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean) |
title_full_unstemmed |
Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean) |
title_sort |
intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the canadian beaufort shelf (arctic ocean) |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://amu.hal.science/hal-02051678 https://amu.hal.science/hal-02051678/document https://amu.hal.science/hal-02051678/file/bg-9-4787-2012.pdf https://doi.org/10.5194/bg-9-4787-2012 |
genre |
Arctic Arctic Ocean Copepods midnight sun |
genre_facet |
Arctic Arctic Ocean Copepods midnight sun |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://amu.hal.science/hal-02051678 Biogeosciences, 2012, 9 (11), pp.4787-4802. ⟨10.5194/bg-9-4787-2012⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-9-4787-2012 hal-02051678 https://amu.hal.science/hal-02051678 https://amu.hal.science/hal-02051678/document https://amu.hal.science/hal-02051678/file/bg-9-4787-2012.pdf doi:10.5194/bg-9-4787-2012 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/bg-9-4787-2012 |
container_title |
Biogeosciences |
container_volume |
9 |
container_issue |
11 |
container_start_page |
4787 |
op_container_end_page |
4802 |
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1786823759393456128 |