Ocean acidification impacts growth and shell mineralization in juvenile abalone (Haliotis tuberculata)

• Published in: Marine Biology
• Main Authors: Auzoux-Bordenave, Stéphanie, Wessel, Nathalie, Badou, Aïcha, Martin, Sophie, M'Zoudi, Saloua, Avignon, Solène, Roussel, Sabine, Huchette, Sylvain, Dubois, Philippe
• Other Authors: Biologie des Organismes et Ecosystèmes Aquatiques (BOREA), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA), Sorbonne Université (SU), Unité Dynamiques des Écosystèmes Côtiers (DYNECO), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Station de Biologie Marine de Concarneau, Direction générale déléguée à la Recherche, à l’Expertise, à la Valorisation et à l’Enseignement-Formation (DGD.REVE), Muséum national d'Histoire naturelle (MNHN)-Muséum national d'Histoire naturelle (MNHN), Adaptation et diversité en milieu marin (ADMM), Centre National de la Recherche Scientifique (CNRS)-Station biologique de Roscoff = Roscoff Marine Station (SBR), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université libre de Bruxelles (ULB), 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), Scea France Haliotis, This work was supported in part by the ATM program “Biomineralization” of the MNHN funded by the Ministère délégué à l’Enseignement Supérieur et à la Recherche (Paris, France) and by the ICOBio project under the program “Acidification des Océans” funded by the Fondation pour la Recherche sur la Biodiversité (FRB) and the Ministère de la Transition Ecologique et Solidaire (MTES). We thank Dr. Chakib Djejat and Stéphane Formosa for their assistance in scanning electron microscopy (SEM, Plateau technique de Microscopie Electronique, MNHN, Paris and Concarneau, France). The Regional Council of Brittany, the General Council of Finistère, the urban community of Concarneau Cornouaille Agglomération and the European Regional Development Fund (ERDF) are acknowledged for the funding of the Sigma 300 FE-SEM of the Concarneau Marine Station
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2020
• Subjects: ocean acidification; ACL; growth; juvenile; abalone; shell mineralization; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography; Ocean acidification
• Online Access: https://hal.science/hal-02558510; https://hal.science/hal-02558510/document; https://hal.science/hal-02558510/file/Proof%20Auzoux_Bordenave%20et%20al_MABI_2020.pdf; https://doi.org/10.1007/s00227-019-3623-0

International audience Ocean acidification (OA) is a major global driver that leads to substantial changes in seawater carbonate chemistry, with potentially serious consequences for calcifying organisms. Marine shelled molluscs are ecologically and economically important species, providing essential ecosystem services and food sources for other species. Due to their physiological characteristics and their use of calcium carbonate (CaCO 3) to build their shells, molluscs are among the most vulnerable invertebrates with regard to OA, with early developmental stages being particularly sensitive to pH changes. This study investigated the effects of CO 2-induced OA on juveniles of the European abalone Haliotis tuberculata, a commercially important gastropod species. Six-month-old juvenile abalones were cultured for 3 months at four pH levels (8.1, 7.8, 7.7, 7.6) representing current and predicted near-future conditions. Survival, growth, shell microstructure, thickness, and strength were compared across the four pH treatments. After 3 months of exposure, significant reductions in juvenile shell length, weight, and strength were revealed in the pH 7.6 treatment. Scanning electron microscopy observations also revealed modified texture and porosity of the shell mineral layers as well as alterations of the periostracum at pH 7.6 which was the only treatment with an aragonite saturation state below 1. It is concluded that low pH induces both general effects on growth mechanisms and corrosion of deposited shell in H. tuberculata. This will impact both the ecological role of this species and the costs of its aquaculture.