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Marine Ecology Progress Series

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MEPS 559:257-263 (2016)  -  DOI:

Resilience to ocean acidification: decreased carbonic anhydrase activity in sea anemones under high pCO2 conditions

Patricia Ventura1,*, Michael D. Jarrold2,3,4,*, Pierre-Laurent Merle1,†, Stéphanie Barnay-Verdier1, Thamilla Zamoum1, Riccardo Rodolfo-Metalpa5, Piero Calosi2,6, Paola Furla1,** 

1Sorbonne Universités, UPMC Université Paris 06, Université Antilles, Université Nice Sophia Antipolis, ‘Evolution Paris Seine’, CNRS, ‘Evolution Paris Seine’ - Institut de Biologie Paris Seine (EPS-IBPS), 7 quai Saint-Bernard, 75252 Paris cedex 05, France
2Marine Biology and Ecology Research Centre, Plymouth University, Drake Circus, Plymouth PL4 8AA, UK
3College of Marine and Environmental Sciences, James Cook University, Townsville, Queensland 4811, Australia
4ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, Queensland 4814, Australia
5Laboratoire d’Excellence ‘CORAIL’, Institut de Recherche pour le Développement, UMR250 ENTROPIE, Nouméa, Nouvelle Calédonie
6Département de Biologie Chimie et Géographie, Université du Québec à Rimouski, Rimouski, Québec G5L 3A1, Canada
*These authors contributed equally to this work**Corresponding author:    Deceased

ABSTRACT: Non-calcifying photosynthetic anthozoans have emerged as a group that may thrive under high carbon dioxide partial pressure ( pCO2) conditions via increased productivity. However, the physiological mechanisms underlying this potential success are unclear. Here we investigated the impact of high pCO2 on the dissolved inorganic carbon (DIC) use in the temperate sea anemone Anemonia viridis. We assessed the impacts of long-term exposure to high pCO2, i.e. sampling in situ natural CO2 vents (Vulcano, Italy), and short-term exposure, i.e. during a 3 wk controlled laboratory experiment. We focused on photo-physiological parameters (net photosynthesis rates, chlorophyll a content and Symbiodinium density) and on carbonic anhydrase (CA) activity, an enzyme involved in the energy-demanding process of DIC absorption. Long-term exposure to high pCO2 had no impact on Symbiodinium density and chlorophyll a content. In contrst, short-term exposure to high pCO2 induced a significant reduction in Symbiodinium density, which together with unchanged net photosynthesis resulted in the increase of Symbiodinium productivity per cell. Finally, in both in situ long-term and laboratory short-term exposure to high pCO2, we observed a significant decrease in the CA activity of sea anemones, suggesting a change in DIC use (i.e. from an HCO3- to a CO2 user). This change could enable a shift in the energy budget that may increase the ability of non-calcifying photosynthetic anthozoans to cope with ocean acidification.

KEY WORDS: Dissolved inorganic carbon uptake · Carbonic anhydrase · Ocean acidification · Plasticity · CO2 vent · Anemonia viridis

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Cite this article as: Ventura P, Jarrold MD, Merle PL, Barnay-Verdier S and others (2016) Resilience to ocean acidification: decreased carbonic anhydrase activity in sea anemones under high pCO2 conditions. Mar Ecol Prog Ser 559:257-263.

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