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 similar to 100m 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 tha...
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ftird:oai:ird.fr:fdi:010081596 2023-05-15T14:26:08+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. Charrière, B. Forest, A. Heussner, S. Vaultier, F. Petit, M. Delsaut, N. Fortier, L. Sempéré, Richard ARCTIQUE CANADA 2012 text/pdf http://www.documentation.ird.fr/hor/fdi:010081596 EN eng http://www.documentation.ird.fr/hor/fdi:010081596 oai:ird.fr:fdi:010081596 Rontani J. F., Charrière B., Forest A., Heussner S., Vaultier F., Petit M., Delsaut N., Fortier L., Sempéré Richard. Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean). Biogeosciences, 2012, 9 (11), p. 4787-4802. text 2012 ftird 2021-03-16T23:52:17Z The lipid content of seven samples of sinking particles collected with sediment traps moored at similar to 100m 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. Text Arctic Arctic Arctic Ocean Arctique* Copepods midnight sun IRD (Institute de recherche pour le développement): Horizon Arctic Arctic Ocean Canada Beaufort Shelf ENVELOPE(-142.500,-142.500,70.000,70.000) |
institution |
Open Polar |
collection |
IRD (Institute de recherche pour le développement): Horizon |
op_collection_id |
ftird |
language |
English |
description |
The lipid content of seven samples of sinking particles collected with sediment traps moored at similar to 100m 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 |
Text |
author |
Rontani, J. F. Charrière, B. Forest, A. Heussner, S. Vaultier, F. Petit, M. Delsaut, N. Fortier, L. Sempéré, Richard |
spellingShingle |
Rontani, J. F. Charrière, B. Forest, A. Heussner, S. Vaultier, F. Petit, M. Delsaut, N. Fortier, L. Sempéré, Richard Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean) |
author_facet |
Rontani, J. F. Charrière, B. Forest, A. Heussner, S. Vaultier, F. Petit, M. Delsaut, N. Fortier, L. Sempéré, 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) |
publishDate |
2012 |
url |
http://www.documentation.ird.fr/hor/fdi:010081596 |
op_coverage |
ARCTIQUE CANADA |
long_lat |
ENVELOPE(-142.500,-142.500,70.000,70.000) |
geographic |
Arctic Arctic Ocean Canada Beaufort Shelf |
geographic_facet |
Arctic Arctic Ocean Canada Beaufort Shelf |
genre |
Arctic Arctic Arctic Ocean Arctique* Copepods midnight sun |
genre_facet |
Arctic Arctic Arctic Ocean Arctique* Copepods midnight sun |
op_relation |
http://www.documentation.ird.fr/hor/fdi:010081596 oai:ird.fr:fdi:010081596 Rontani J. F., Charrière B., Forest A., Heussner S., Vaultier F., Petit M., Delsaut N., Fortier L., Sempéré Richard. Intense photooxidative degradation of planktonic and bacterial lipids in sinking particles collected with sediment traps across the Canadian Beaufort Shelf (Arctic Ocean). Biogeosciences, 2012, 9 (11), p. 4787-4802. |
_version_ |
1766298603198873600 |