Environmental anomalies, energetic reserves and fatty acid modifications in oysters coincide with an exceptional mortality event
Mortality of oysters Crassostrea gigas occurred along the coasts of France during summer 2008, causing a serious crisis in French oyster production. During spring to summer 2008, 5 groups of 1-yr old oysters of different origins and ploidy levels deployed in the Thau lagoon (France) were sampled for...
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ftarchimer:oai:archimer.ifremer.fr:11388 2023-05-15T15:59:03+02:00 Environmental anomalies, energetic reserves and fatty acid modifications in oysters coincide with an exceptional mortality event Pernet, Fabrice Barret, Jean Marty, Claire Moal, Jeanne Le Gall, Patrik Boudry, Pierre 2010-02 application/pdf https://archimer.ifremer.fr/doc/00003/11388/7964.pdf https://doi.org/10.3354/meps08407 https://archimer.ifremer.fr/doc/00003/11388/ eng eng Inter-research https://archimer.ifremer.fr/doc/00003/11388/7964.pdf doi:10.3354/meps08407 https://archimer.ifremer.fr/doc/00003/11388/ Inter-Research 2010 info:eu-repo/semantics/openAccess restricted use Marine Ecology-progress Series (0171-8630) (Inter-research), 2010-02 , Vol. 401 , P. 129-146 Bivalves Energetic reserve Environment Fatty acid Summer mortality Trophic signatures Temperature text Publication info:eu-repo/semantics/article 2010 ftarchimer https://doi.org/10.3354/meps08407 2021-09-23T20:18:11Z Mortality of oysters Crassostrea gigas occurred along the coasts of France during summer 2008, causing a serious crisis in French oyster production. During spring to summer 2008, 5 groups of 1-yr old oysters of different origins and ploidy levels deployed in the Thau lagoon (France) were sampled for biometrical and biochemical analyses; environmental parameters were monitored in the same area. Mortality occurred in 2 episodes: 13 May to 10 June and 24 June to 9 July. Wild-collected oysters showed mortality sooner than other groups but total overall mortality was 85% in all groups. Mortality occurred when seawater temperature was >19 degrees C during the reproductive season when energetic reserves of oysters were at their lowest. Energy reserve levels and mortality in oysters seemed to be independent of reproductive effort, and most likely reflected an unusual deficit in phytoplankton. The level of bacterial fatty acids in oysters increased markedly before the second mortality event, probably indicating an enhancement of the microbial loop or decomposition processes. At the same time, unsaturation of oyster fatty acids decreased, suggesting a diet change, acclimatization to increasing temperature or, most likely, oxidative damage clue to an enhanced production of reactive oxygen species, which are often associated with stressful situations. Wild-collected and hatchery-produced oysters, which exhibited different mortality patterns, showed persistent differences in fatty acid (20:5n-3 and 22:6n-3) content in their membrane, despite the fact that they were reared in the same environment. Mortality started when fatty acid 20:4n-6 content increased to similar to 3% in the polar lipids, suggesting that this ratio could make a useful indicator of mortality risk. Finally, the 2008 mortality event coincided with a nationwide increase of similar to 1.5 degrees C in winter seawater temperature, which may impact the oyster and its pathogens. Article in Journal/Newspaper Crassostrea gigas Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Marine Ecology Progress Series 401 129 146 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Bivalves Energetic reserve Environment Fatty acid Summer mortality Trophic signatures Temperature |
spellingShingle |
Bivalves Energetic reserve Environment Fatty acid Summer mortality Trophic signatures Temperature Pernet, Fabrice Barret, Jean Marty, Claire Moal, Jeanne Le Gall, Patrik Boudry, Pierre Environmental anomalies, energetic reserves and fatty acid modifications in oysters coincide with an exceptional mortality event |
topic_facet |
Bivalves Energetic reserve Environment Fatty acid Summer mortality Trophic signatures Temperature |
description |
Mortality of oysters Crassostrea gigas occurred along the coasts of France during summer 2008, causing a serious crisis in French oyster production. During spring to summer 2008, 5 groups of 1-yr old oysters of different origins and ploidy levels deployed in the Thau lagoon (France) were sampled for biometrical and biochemical analyses; environmental parameters were monitored in the same area. Mortality occurred in 2 episodes: 13 May to 10 June and 24 June to 9 July. Wild-collected oysters showed mortality sooner than other groups but total overall mortality was 85% in all groups. Mortality occurred when seawater temperature was >19 degrees C during the reproductive season when energetic reserves of oysters were at their lowest. Energy reserve levels and mortality in oysters seemed to be independent of reproductive effort, and most likely reflected an unusual deficit in phytoplankton. The level of bacterial fatty acids in oysters increased markedly before the second mortality event, probably indicating an enhancement of the microbial loop or decomposition processes. At the same time, unsaturation of oyster fatty acids decreased, suggesting a diet change, acclimatization to increasing temperature or, most likely, oxidative damage clue to an enhanced production of reactive oxygen species, which are often associated with stressful situations. Wild-collected and hatchery-produced oysters, which exhibited different mortality patterns, showed persistent differences in fatty acid (20:5n-3 and 22:6n-3) content in their membrane, despite the fact that they were reared in the same environment. Mortality started when fatty acid 20:4n-6 content increased to similar to 3% in the polar lipids, suggesting that this ratio could make a useful indicator of mortality risk. Finally, the 2008 mortality event coincided with a nationwide increase of similar to 1.5 degrees C in winter seawater temperature, which may impact the oyster and its pathogens. |
format |
Article in Journal/Newspaper |
author |
Pernet, Fabrice Barret, Jean Marty, Claire Moal, Jeanne Le Gall, Patrik Boudry, Pierre |
author_facet |
Pernet, Fabrice Barret, Jean Marty, Claire Moal, Jeanne Le Gall, Patrik Boudry, Pierre |
author_sort |
Pernet, Fabrice |
title |
Environmental anomalies, energetic reserves and fatty acid modifications in oysters coincide with an exceptional mortality event |
title_short |
Environmental anomalies, energetic reserves and fatty acid modifications in oysters coincide with an exceptional mortality event |
title_full |
Environmental anomalies, energetic reserves and fatty acid modifications in oysters coincide with an exceptional mortality event |
title_fullStr |
Environmental anomalies, energetic reserves and fatty acid modifications in oysters coincide with an exceptional mortality event |
title_full_unstemmed |
Environmental anomalies, energetic reserves and fatty acid modifications in oysters coincide with an exceptional mortality event |
title_sort |
environmental anomalies, energetic reserves and fatty acid modifications in oysters coincide with an exceptional mortality event |
publisher |
Inter-research |
publishDate |
2010 |
url |
https://archimer.ifremer.fr/doc/00003/11388/7964.pdf https://doi.org/10.3354/meps08407 https://archimer.ifremer.fr/doc/00003/11388/ |
genre |
Crassostrea gigas |
genre_facet |
Crassostrea gigas |
op_source |
Marine Ecology-progress Series (0171-8630) (Inter-research), 2010-02 , Vol. 401 , P. 129-146 |
op_relation |
https://archimer.ifremer.fr/doc/00003/11388/7964.pdf doi:10.3354/meps08407 https://archimer.ifremer.fr/doc/00003/11388/ |
op_rights |
Inter-Research 2010 info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.3354/meps08407 |
container_title |
Marine Ecology Progress Series |
container_volume |
401 |
container_start_page |
129 |
op_container_end_page |
146 |
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1766394837995618304 |