Metabolic responses to temperature stress under elevated pCO2 in Crepidula fornicata

• Published in: Journal of Molluscan Studies
• Main Authors: Noisette, Fanny, Richard, Joelle, Le Fur, Ines, Peck, Lloyd S., Davoult, Dominique, Martin, Sophie
• Other Authors: Ecogéochimie et Fonctionnement des Ecosystèmes Benthiques (EFEB), Adaptation et diversité en milieu marin (AD2M), Station biologique de Roscoff (SBR), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Station biologique de Roscoff (SBR), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), 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 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), British Antarctic Survey (BAS), Natural Environment Research Council (NERC), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), European Project: 211384,EC:FP7:ENV,FP7-ENV-2007-1,EPOCA(2008)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2015
• Subjects: SLIPPER LIMPET; ANTARCTIC BIVALVE; LATERNULA-ELLIPTICA; PHYSIOLOGICAL ENERGETICS; CRASSOSTREA-VIRGINICA; GLOBAL CHANGE; THERMAL TOLERANCE; OCEAN ACIDIFICATION; LIFE-HISTORY STAGES; ACID-BASE-BALANCE; ACL; [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; [SDV.BA]Life Sciences [q-bio]/Animal biology; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; Antarctic; Antarc*; Ocean acidification
• Online Access: https://hal.sorbonne-universite.fr/hal-01100959; https://hal.sorbonne-universite.fr/hal-01100959/document; https://hal.sorbonne-universite.fr/hal-01100959/file/Noisette-et-al_In-Press_J.%20Molluscan%20Studies.pdf; https://doi.org/10.1093/mollus/eyu084

International audience In the current context of environmental change, ocean acidification is predicted to affect the cellular processes, physiology and behaviour of all marine organisms, impacting survival, growth and reproduction. In relation to thermal tolerance limits, the effects of elevated pCO2 could be expected to be more pronounced at the upper limits of the thermal tolerance window. Our study focused on Crepidula fornicata, an invasive gastropod which colonized shallow waters around European coasts during the 20th century. We investigated the effects of 10 weeks' exposure to current (380 µatm) and elevated (550, 750, 1,000 µatm) pCO2 on this engineer species using an acute temperature increase (1 °C 12 h−1) as the test. Respiration rates were measured on both males (small individuals) and females (large individuals). Mortality increased suddenly from 34 °C, particularly in females. Respiration rate in C. fornicata increased linearly with temperature between 18 and 34 °C, but no differences were detected between the different pCO2 conditions either in the regressions between respiration rate and temperature or in Q10 values. In the same way, condition indices were similar in all the pCO2 treatments at the end of the experiment, but decreased from the beginning of the experiment. This species was highly resistant to acute exposure to high temperature regardless of pCO2 levels, even though food was limited during the experiment. Crepidula fornicata appears to have either developed resistance mechanisms or a strong phenotypic plasticity to deal with fluctuations of physicochemical parameters in its habitat. This suggests that invasive species may be more resistant to future environmental changes than its native competitors.