Impact of anoxia and oyster mortality on nutrient and microbial planktonic components: A mesocosm study
International audience The Thau lagoon is a Mediterranean coastal lagoon used for shellfish farming. It is periodically affected by anoxia events that trigger oyster mortality. To investigate the effects of an anoxia event focussed on nutrient dynamics and the responses of the microbial planktonic c...
Published in: | Aquaculture |
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Main Authors: | , , , , , , , , , , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2023
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Subjects: | |
Online Access: | https://hal.umontpellier.fr/hal-03936612 https://hal.umontpellier.fr/hal-03936612/document https://hal.umontpellier.fr/hal-03936612/file/2023_Rigaud_S_Aquacult_vdep.pdf https://doi.org/10.1016/j.aquaculture.2022.739171 |
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ftunivtoulon:oai:HAL:hal-03936612v1 |
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Open Polar |
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Université de Toulon: HAL |
op_collection_id |
ftunivtoulon |
language |
English |
topic |
Oxygen Phytoplankton Anoxia Community shift Microbial loop [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
Oxygen Phytoplankton Anoxia Community shift Microbial loop [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.MCG]Environmental Sciences/Global Changes Le Ray, Julie Bec, Béatrice Fiandrino, Annie Lagarde, Franck Cimiterra, Nicolas Raimbault, Patrick Roques, Cécile Rigaud, Sylvain Régis, Julie Mostajir, Behzad Mas, Sébastien Richard, Marion Impact of anoxia and oyster mortality on nutrient and microbial planktonic components: A mesocosm study |
topic_facet |
Oxygen Phytoplankton Anoxia Community shift Microbial loop [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience The Thau lagoon is a Mediterranean coastal lagoon used for shellfish farming. It is periodically affected by anoxia events that trigger oyster mortality. To investigate the effects of an anoxia event focussed on nutrient dynamics and the responses of the microbial planktonic communities a 13-day in situ experiment was performed in September 2020. Transparent mesocosms (270 L) were placed at a depth of 4 m, inserted in the sediment, and kept closed throughout the experiment. The experiment comprised three treatments: i) Natural environment (N), i.e. in the natural water outside the mesocosms containing a rope of 30 oysters (Crassostrea gigas), ii) Control mesocosm (C) filled with natural water with no oysters, and iii) Oyster mesocosm (O) filled with natural water containing a rope of 30 oysters. Oyster respiration in the oyster mesocosm depleted oxygen after 54 h. All the oysters from O mesocosm were dead after nine days and decomposition of their flesh combined with releases from the water-sediment interface increased dissolved inorganic nitrogen (dominated by ammonium), phosphates, and ∑H2S up to 390, 17 and 295 μmol·L−1, respectively. Phytoplankton biomass consequently increased by 20 (11.8 μg chlal −1) and abundance by 4.5 (186 × 106 cells·L1) dominated largely by green algae \textless5 μm. During the oyster mortality period (day 6 to day 9) high abundances of heterotrophic flagellates and large ciliate specimens were observed. This shift in the community towards small phytoplankton favours the microbial loop and is detrimental to shellfish farming. In a context of global warming in which the risk of anoxia is higher, the results of the present investigation demonstrate that anoxia triggers shellfish mortality and that the change in the plankton community disrupts the normal functioning of the ecosystem, causing serious financial losses. In this context, it is crucial to predict possible hypoxia and anoxia events using high frequency measurements of dissolved oxygen, by avoiding ... |
author2 |
MARine Biodiversity Exploitation and Conservation - MARBEC (UMR MARBEC ) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM) 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) Détection, évaluation, gestion des risques CHROniques et éMErgents (CHROME) / Université de Nîmes (CHROME) Université de Nîmes (UNIMES) Observatoire de REcherche Méditerranéen de l'Environnement (OSU OREME) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université de Montpellier (UM) This study was funded by Ifremer (2020−2021), EC2CO HYBIGE (2021−2022), and by MARBEC and was conducted by Marion Richard. The study was part of the PhD research of Julie Le Ray, funded by Ifremer. With the support of LabEx CeMEB, an ANR “Investissements d'avenir” program (ANR-10-LABX-04-01). With the support of OSU-Pytheas one in Marseille. ANR-10-LABX-0004,CeMEB,Mediterranean Center for Environment and Biodiversity(2010) |
format |
Article in Journal/Newspaper |
author |
Le Ray, Julie Bec, Béatrice Fiandrino, Annie Lagarde, Franck Cimiterra, Nicolas Raimbault, Patrick Roques, Cécile Rigaud, Sylvain Régis, Julie Mostajir, Behzad Mas, Sébastien Richard, Marion |
author_facet |
Le Ray, Julie Bec, Béatrice Fiandrino, Annie Lagarde, Franck Cimiterra, Nicolas Raimbault, Patrick Roques, Cécile Rigaud, Sylvain Régis, Julie Mostajir, Behzad Mas, Sébastien Richard, Marion |
author_sort |
Le Ray, Julie |
title |
Impact of anoxia and oyster mortality on nutrient and microbial planktonic components: A mesocosm study |
title_short |
Impact of anoxia and oyster mortality on nutrient and microbial planktonic components: A mesocosm study |
title_full |
Impact of anoxia and oyster mortality on nutrient and microbial planktonic components: A mesocosm study |
title_fullStr |
Impact of anoxia and oyster mortality on nutrient and microbial planktonic components: A mesocosm study |
title_full_unstemmed |
Impact of anoxia and oyster mortality on nutrient and microbial planktonic components: A mesocosm study |
title_sort |
impact of anoxia and oyster mortality on nutrient and microbial planktonic components: a mesocosm study |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.umontpellier.fr/hal-03936612 https://hal.umontpellier.fr/hal-03936612/document https://hal.umontpellier.fr/hal-03936612/file/2023_Rigaud_S_Aquacult_vdep.pdf https://doi.org/10.1016/j.aquaculture.2022.739171 |
genre |
Crassostrea gigas |
genre_facet |
Crassostrea gigas |
op_source |
ISSN: 0044-8486 EISSN: 1873-5622 Aquaculture https://hal.umontpellier.fr/hal-03936612 Aquaculture, 2023, 566, pp.739171. ⟨10.1016/j.aquaculture.2022.739171⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.aquaculture.2022.739171 hal-03936612 https://hal.umontpellier.fr/hal-03936612 https://hal.umontpellier.fr/hal-03936612/document https://hal.umontpellier.fr/hal-03936612/file/2023_Rigaud_S_Aquacult_vdep.pdf doi:10.1016/j.aquaculture.2022.739171 WOS: 000909801800001 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.aquaculture.2022.739171 |
container_title |
Aquaculture |
container_volume |
566 |
container_start_page |
739171 |
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1790599480217698304 |
spelling |
ftunivtoulon:oai:HAL:hal-03936612v1 2024-02-11T10:03:16+01:00 Impact of anoxia and oyster mortality on nutrient and microbial planktonic components: A mesocosm study Le Ray, Julie Bec, Béatrice Fiandrino, Annie Lagarde, Franck Cimiterra, Nicolas Raimbault, Patrick Roques, Cécile Rigaud, Sylvain Régis, Julie Mostajir, Behzad Mas, Sébastien Richard, Marion MARine Biodiversity Exploitation and Conservation - MARBEC (UMR MARBEC ) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM) 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) Détection, évaluation, gestion des risques CHROniques et éMErgents (CHROME) / Université de Nîmes (CHROME) Université de Nîmes (UNIMES) Observatoire de REcherche Méditerranéen de l'Environnement (OSU OREME) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université de Montpellier (UM) This study was funded by Ifremer (2020−2021), EC2CO HYBIGE (2021−2022), and by MARBEC and was conducted by Marion Richard. The study was part of the PhD research of Julie Le Ray, funded by Ifremer. With the support of LabEx CeMEB, an ANR “Investissements d'avenir” program (ANR-10-LABX-04-01). With the support of OSU-Pytheas one in Marseille. ANR-10-LABX-0004,CeMEB,Mediterranean Center for Environment and Biodiversity(2010) 2023-03-15 https://hal.umontpellier.fr/hal-03936612 https://hal.umontpellier.fr/hal-03936612/document https://hal.umontpellier.fr/hal-03936612/file/2023_Rigaud_S_Aquacult_vdep.pdf https://doi.org/10.1016/j.aquaculture.2022.739171 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.aquaculture.2022.739171 hal-03936612 https://hal.umontpellier.fr/hal-03936612 https://hal.umontpellier.fr/hal-03936612/document https://hal.umontpellier.fr/hal-03936612/file/2023_Rigaud_S_Aquacult_vdep.pdf doi:10.1016/j.aquaculture.2022.739171 WOS: 000909801800001 info:eu-repo/semantics/OpenAccess ISSN: 0044-8486 EISSN: 1873-5622 Aquaculture https://hal.umontpellier.fr/hal-03936612 Aquaculture, 2023, 566, pp.739171. ⟨10.1016/j.aquaculture.2022.739171⟩ Oxygen Phytoplankton Anoxia Community shift Microbial loop [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2023 ftunivtoulon https://doi.org/10.1016/j.aquaculture.2022.739171 2024-01-23T23:34:39Z International audience The Thau lagoon is a Mediterranean coastal lagoon used for shellfish farming. It is periodically affected by anoxia events that trigger oyster mortality. To investigate the effects of an anoxia event focussed on nutrient dynamics and the responses of the microbial planktonic communities a 13-day in situ experiment was performed in September 2020. Transparent mesocosms (270 L) were placed at a depth of 4 m, inserted in the sediment, and kept closed throughout the experiment. The experiment comprised three treatments: i) Natural environment (N), i.e. in the natural water outside the mesocosms containing a rope of 30 oysters (Crassostrea gigas), ii) Control mesocosm (C) filled with natural water with no oysters, and iii) Oyster mesocosm (O) filled with natural water containing a rope of 30 oysters. Oyster respiration in the oyster mesocosm depleted oxygen after 54 h. All the oysters from O mesocosm were dead after nine days and decomposition of their flesh combined with releases from the water-sediment interface increased dissolved inorganic nitrogen (dominated by ammonium), phosphates, and ∑H2S up to 390, 17 and 295 μmol·L−1, respectively. Phytoplankton biomass consequently increased by 20 (11.8 μg chlal −1) and abundance by 4.5 (186 × 106 cells·L1) dominated largely by green algae \textless5 μm. During the oyster mortality period (day 6 to day 9) high abundances of heterotrophic flagellates and large ciliate specimens were observed. This shift in the community towards small phytoplankton favours the microbial loop and is detrimental to shellfish farming. In a context of global warming in which the risk of anoxia is higher, the results of the present investigation demonstrate that anoxia triggers shellfish mortality and that the change in the plankton community disrupts the normal functioning of the ecosystem, causing serious financial losses. In this context, it is crucial to predict possible hypoxia and anoxia events using high frequency measurements of dissolved oxygen, by avoiding ... Article in Journal/Newspaper Crassostrea gigas Université de Toulon: HAL Aquaculture 566 739171 |