Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean)
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 (Arctic Ocean) was investigated. Our main goal was to quantify and characterize the biotic and abiotic degradation processes that acted...
Published in: | Biogeosciences |
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Copernicus Publications
2012
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00023803 2023-05-15T14:53:33+02:00 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. Charriere, B. Forest, A. Heussner, S. Vaultier, F. Petit, M. Delsaut, N. Fortier, L. Sempéré, R. 2012-11 electronic https://doi.org/10.5194/bg-9-4787-2012 https://noa.gwlb.de/receive/cop_mods_00023803 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023758/bg-9-4787-2012.pdf https://bg.copernicus.org/articles/9/4787/2012/bg-9-4787-2012.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-9-4787-2012 https://noa.gwlb.de/receive/cop_mods_00023803 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023758/bg-9-4787-2012.pdf https://bg.copernicus.org/articles/9/4787/2012/bg-9-4787-2012.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2012 ftnonlinearchiv https://doi.org/10.5194/bg-9-4787-2012 2022-02-08T22:50:26Z 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 (Arctic 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 herbivorous 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 Niedersächsisches Online-Archiv NOA Arctic Arctic Ocean Beaufort Shelf ENVELOPE(-142.500,-142.500,70.000,70.000) Biogeosciences 9 11 4787 4802 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Rontani, J.-F. Charriere, B. Forest, A. Heussner, S. Vaultier, F. Petit, M. Delsaut, N. Fortier, L. Sempéré, R. Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean) |
topic_facet |
article Verlagsveröffentlichung |
description |
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 (Arctic 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 herbivorous 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. |
format |
Article in Journal/Newspaper |
author |
Rontani, J.-F. Charriere, B. Forest, A. Heussner, S. Vaultier, F. Petit, M. Delsaut, N. Fortier, L. Sempéré, R. |
author_facet |
Rontani, J.-F. Charriere, B. Forest, A. Heussner, S. Vaultier, F. Petit, M. Delsaut, N. Fortier, L. Sempéré, R. |
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 |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/bg-9-4787-2012 https://noa.gwlb.de/receive/cop_mods_00023803 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023758/bg-9-4787-2012.pdf https://bg.copernicus.org/articles/9/4787/2012/bg-9-4787-2012.pdf |
long_lat |
ENVELOPE(-142.500,-142.500,70.000,70.000) |
geographic |
Arctic Arctic Ocean Beaufort Shelf |
geographic_facet |
Arctic Arctic Ocean Beaufort Shelf |
genre |
Arctic Arctic Ocean Copepods midnight sun |
genre_facet |
Arctic Arctic Ocean Copepods midnight sun |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-9-4787-2012 https://noa.gwlb.de/receive/cop_mods_00023803 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023758/bg-9-4787-2012.pdf https://bg.copernicus.org/articles/9/4787/2012/bg-9-4787-2012.pdf |
op_rights |
uneingeschränkt 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 |
_version_ |
1766325167396487168 |