Acclimatization of coral reefs to climate change : ecophysiology and geochemical signatures in an ocean acidification context
In a context of rapid and severe climate change, coral reefs are threatened with extinction. The increase in anthropogenic CO2 levels leads to ocean acidification, which can have devastating effects on marine organisms with carbonate skeletons, such as corals. Corals have the ability to acclimate th...
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Other Authors: | , , , , , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
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HAL CCSD
2023
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Subjects: | |
Online Access: | https://theses.hal.science/tel-04383070 https://theses.hal.science/tel-04383070/document https://theses.hal.science/tel-04383070/file/These-2023-SML-Ecologie_marine-TANVET_Clement.pdf |
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ftunivbrest:oai:HAL:tel-04383070v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
language |
French |
topic |
Corals Acclimatization Climate Physiology Geochemical proxies Coraux Acclimatation Climat Physiologie Proxies géochimiques [SDV.EE]Life Sciences [q-bio]/Ecology environment |
spellingShingle |
Corals Acclimatization Climate Physiology Geochemical proxies Coraux Acclimatation Climat Physiologie Proxies géochimiques [SDV.EE]Life Sciences [q-bio]/Ecology environment Tanvet, Clément Acclimatization of coral reefs to climate change : ecophysiology and geochemical signatures in an ocean acidification context |
topic_facet |
Corals Acclimatization Climate Physiology Geochemical proxies Coraux Acclimatation Climat Physiologie Proxies géochimiques [SDV.EE]Life Sciences [q-bio]/Ecology environment |
description |
In a context of rapid and severe climate change, coral reefs are threatened with extinction. The increase in anthropogenic CO2 levels leads to ocean acidification, which can have devastating effects on marine organisms with carbonate skeletons, such as corals. Corals have the ability to acclimate through various mechanisms, including ecophysiological. This thesis explores the acclimatization capacities of coral reefs to climate change, particularly to ocean acidification. Recent studies have revealed a natural site in New Caledonia (Bouraké mangroves) hosting diverse coral reefs despite extreme and fluctuating H/Temperature/Dissolved oxygen seawater conditions. By coupling ecophysiological, metagenomic and geochemical approaches, the objectives of this thesis are to identify the mechanisms set up by Bouraké corals in response to these conditions, by comparing them to corals from an adjacent reference site. The first results of this thesis showed a strong coral recruitment at Bouraké. In addition, corals from Bouraké exposed to different levels of pCO2 showed increased calcification compared to corals from the reference site. We have shown symbiotic associations specific to Bouraké corals, as well as the influence of symbiotic communties on the regulation of coral calcification. Finally, we confirmed by a aleoenvironmental study that Bouraké corals have been acclimatized to extreme pH conditions for at least the last three decades. This thesis highlights the adaptive potential of some corals to the rapid climate change underway. Dans un contexte de changements climatiques rapides et sévères, les récifs coralliens sont menacés de disparition. L’élévation des teneurs en CO2 d’origine anthropique génère une acidification des océans qui peut avoir des effets dévastateurs sur les organismes marins à squelette carbonaté, tels que les coraux. Les coraux ont la capacité de s’acclimater via différents mécanismes, notamment écophysiologiques. Cette thèse explore les capacités d’acclimatation des récifs coralliens au ... |
author2 |
Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Ecologie marine tropicale des océans Pacifique et Indien (ENTROPIE Nouvelle-Calédonie ) Institut de Recherche pour le Développement (IRD Nouvelle-Calédonie )-Délégation Ifremer de Nouvelle-Calédonie Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de la Nouvelle-Calédonie (UNC)-Centre National de la Recherche Scientifique (CNRS) Université de Bretagne occidentale - Brest Gérard Thouzeau Jill Naomi Sutton Riccardo Rodolfo-Metalpa |
format |
Doctoral or Postdoctoral Thesis |
author |
Tanvet, Clément |
author_facet |
Tanvet, Clément |
author_sort |
Tanvet, Clément |
title |
Acclimatization of coral reefs to climate change : ecophysiology and geochemical signatures in an ocean acidification context |
title_short |
Acclimatization of coral reefs to climate change : ecophysiology and geochemical signatures in an ocean acidification context |
title_full |
Acclimatization of coral reefs to climate change : ecophysiology and geochemical signatures in an ocean acidification context |
title_fullStr |
Acclimatization of coral reefs to climate change : ecophysiology and geochemical signatures in an ocean acidification context |
title_full_unstemmed |
Acclimatization of coral reefs to climate change : ecophysiology and geochemical signatures in an ocean acidification context |
title_sort |
acclimatization of coral reefs to climate change : ecophysiology and geochemical signatures in an ocean acidification context |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://theses.hal.science/tel-04383070 https://theses.hal.science/tel-04383070/document https://theses.hal.science/tel-04383070/file/These-2023-SML-Ecologie_marine-TANVET_Clement.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
https://theses.hal.science/tel-04383070 Ecologie, Environnement. Université de Bretagne occidentale - Brest, 2023. Français. ⟨NNT : 2023BRES0028⟩ |
op_relation |
NNT: 2023BRES0028 tel-04383070 https://theses.hal.science/tel-04383070 https://theses.hal.science/tel-04383070/document https://theses.hal.science/tel-04383070/file/These-2023-SML-Ecologie_marine-TANVET_Clement.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1797591273690890240 |
spelling |
ftunivbrest:oai:HAL:tel-04383070v1 2024-04-28T08:34:41+00:00 Acclimatization of coral reefs to climate change : ecophysiology and geochemical signatures in an ocean acidification context Acclimatation des récifs coralliens aux changements climatiques : écophysiologie et signatures géochimiques dans un contexte d'acidification des océans Tanvet, Clément Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Ecologie marine tropicale des océans Pacifique et Indien (ENTROPIE Nouvelle-Calédonie ) Institut de Recherche pour le Développement (IRD Nouvelle-Calédonie )-Délégation Ifremer de Nouvelle-Calédonie Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de la Nouvelle-Calédonie (UNC)-Centre National de la Recherche Scientifique (CNRS) Université de Bretagne occidentale - Brest Gérard Thouzeau Jill Naomi Sutton Riccardo Rodolfo-Metalpa 2023-05-24 https://theses.hal.science/tel-04383070 https://theses.hal.science/tel-04383070/document https://theses.hal.science/tel-04383070/file/These-2023-SML-Ecologie_marine-TANVET_Clement.pdf fr fre HAL CCSD NNT: 2023BRES0028 tel-04383070 https://theses.hal.science/tel-04383070 https://theses.hal.science/tel-04383070/document https://theses.hal.science/tel-04383070/file/These-2023-SML-Ecologie_marine-TANVET_Clement.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-04383070 Ecologie, Environnement. Université de Bretagne occidentale - Brest, 2023. Français. ⟨NNT : 2023BRES0028⟩ Corals Acclimatization Climate Physiology Geochemical proxies Coraux Acclimatation Climat Physiologie Proxies géochimiques [SDV.EE]Life Sciences [q-bio]/Ecology environment info:eu-repo/semantics/doctoralThesis Theses 2023 ftunivbrest 2024-04-10T23:46:14Z In a context of rapid and severe climate change, coral reefs are threatened with extinction. The increase in anthropogenic CO2 levels leads to ocean acidification, which can have devastating effects on marine organisms with carbonate skeletons, such as corals. Corals have the ability to acclimate through various mechanisms, including ecophysiological. This thesis explores the acclimatization capacities of coral reefs to climate change, particularly to ocean acidification. Recent studies have revealed a natural site in New Caledonia (Bouraké mangroves) hosting diverse coral reefs despite extreme and fluctuating H/Temperature/Dissolved oxygen seawater conditions. By coupling ecophysiological, metagenomic and geochemical approaches, the objectives of this thesis are to identify the mechanisms set up by Bouraké corals in response to these conditions, by comparing them to corals from an adjacent reference site. The first results of this thesis showed a strong coral recruitment at Bouraké. In addition, corals from Bouraké exposed to different levels of pCO2 showed increased calcification compared to corals from the reference site. We have shown symbiotic associations specific to Bouraké corals, as well as the influence of symbiotic communties on the regulation of coral calcification. Finally, we confirmed by a aleoenvironmental study that Bouraké corals have been acclimatized to extreme pH conditions for at least the last three decades. This thesis highlights the adaptive potential of some corals to the rapid climate change underway. Dans un contexte de changements climatiques rapides et sévères, les récifs coralliens sont menacés de disparition. L’élévation des teneurs en CO2 d’origine anthropique génère une acidification des océans qui peut avoir des effets dévastateurs sur les organismes marins à squelette carbonaté, tels que les coraux. Les coraux ont la capacité de s’acclimater via différents mécanismes, notamment écophysiologiques. Cette thèse explore les capacités d’acclimatation des récifs coralliens au ... Doctoral or Postdoctoral Thesis Ocean acidification Université de Bretagne Occidentale: HAL |