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Kavousi J, Roussel S, Martin S, Gaillard F, Badou A, Di Poi C, Huchette S, Dubois P, Auzoux-Bordenave S. Combined effects of ocean warming and acidification on the larval stages of the European abalone Haliotis tuberculata. MARINE POLLUTION BULLETIN 2022; 175:113131. [PMID: 34839953 DOI: 10.1016/j.marpolbul.2021.113131] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 11/07/2021] [Accepted: 11/08/2021] [Indexed: 06/13/2023]
Abstract
This study examined the physiological responses of the larval stages of Haliotis tuberculata, an economically important abalone, to combined temperature (17 °C and 19 °C) and pH (ambient pH and -0.3 units, i.e., +200% increase in seawater acidity) in a full factorial experiment. Tissue organogenesis, shell formation, and shell length significantly declined due to low pH. High temperature significantly increased the proportion of fully shelled larvae at 24 h post-fertilization (hpf), but increased the proportion of unshelled larvae at 72 hpf. Percentage of swimming larvae at 24 hpf, 72 hpf and 96 hpf significantly declined due to high temperature, but not because of low pH. Larval settlement increased under high temperature, but was not affected by low pH. Despite the fact that no interaction between temperature and pH was observed, the results provide additional evidence on the sensitivity of abalone larvae to both low pH and high temperature. This may have negative consequences for the persistence of abalone populations in natural and aquaculture environments in the near future.
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Affiliation(s)
- Javid Kavousi
- Univ Brest, CNRS, IRD, Ifremer, LEMAR, Plouzane, France.
| | | | - Sophie Martin
- Sorbonne Université, 4 place Jussieu, Paris 75005, France; UMR 7144 "Adaptation et Diversité en Milieu Marin" (AD2M), CNRS/SU, Station Biologique de Roscoff, Roscoff, Cedex, 29680, France
| | - Fanny Gaillard
- UMR 7144 "Adaptation et Diversité en Milieu Marin" (AD2M), CNRS/SU, Station Biologique de Roscoff, Roscoff, Cedex, 29680, France
| | - Aicha Badou
- Direction Generale Deleguee a la Recherche, l'Expertise, la Valorisation et l'Enseignement (DGD REVE), Muséum National d'Histoire Naturelle, Station marine de Concarneau, Concarneau 29900, France
| | - Carole Di Poi
- Ifremer, LEMAR UMR 6539 UBO/CNRS/IRD/Ifremer, Argenton, France
| | | | - Philippe Dubois
- Laboratoire de Biologie Marine, Université Libre de Bruxelles, CP160/15, 1050, Brussels, Belgium
| | - Stéphanie Auzoux-Bordenave
- Sorbonne Université, 4 place Jussieu, Paris 75005, France; UMR "Biologie des Organismes et Ecosystèmes Aquatiques" (BOREA), MNHN/CNRS/SU/IRD, Muséum National d'Histoire Naturelle, Station Marine de Concarneau, Concarneau 29900, France
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Single and combined effects of the "Deadly trio" hypoxia, hypercapnia and warming on the cellular metabolism of the great scallop Pecten maximus. Comp Biochem Physiol B Biochem Mol Biol 2020; 243-244:110438. [PMID: 32251734 DOI: 10.1016/j.cbpb.2020.110438] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 02/20/2020] [Accepted: 03/31/2020] [Indexed: 12/11/2022]
Abstract
In the ocean the main climate drivers affecting marine organisms are warming, hypercapnia, and hypoxia. We investigated the acute effects of warming (W), warming plus hypercapnia (WHc, ~1800 μatm CO2), warming plus hypoxia (WHo, ~12.1 kPa O2), and a combined exposure of all three drivers (Deadly Trio, DT) on king scallops (Pecten maximus). All exposures started at 14 °C and temperature was increased by 2 °C once every 48 h until the lethal temperature was reached (28 °C). Gill samples were taken at 14 °C, 18 °C, 22 °C, and 26 °C and analyzed for their metabolic response by 1H-nuclear magnetic resonance (NMR) spectroscopy. Scallops were most tolerant to WHc and most susceptible to oxygen reduction (WHo and DT). In particular under DT, scallops' mitochondrial energy metabolism was affected. Changes became apparent at 22 °C and 26 °C involving significant accumulation of glycogenic amino acids (e.g. glycine and valine) and anaerobic end-products (e.g. acetic acid and succinate). In line with these observations the LT50 was lower under the exposure to DT (22.5 °C) than to W alone (~ 25 °C) indicating a narrowing of the thermal niche due to an imbalance between oxygen demand and supply.
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