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Article Dans Une Revue Marine Ecology Progress Series Année : 2016

Resilience to ocean acidification: decreased carbonic anhydrase activity in sea anemones under high pCO(2) conditions

Patricia Ventura
  • Fonction : Auteur
Michael D. Jarrold
  • Fonction : Auteur
Pierre-Laurent Merle
  • Fonction : Auteur
Stephanie Barnay-Verdier
  • Fonction : Auteur
Thamilla Zamoum
  • Fonction : Auteur
Riccardo Rodolfo-Metalpa
  • Fonction : Auteur
Piero Calosi
  • Fonction : Auteur
Paola Furla
  • Fonction : Auteur

Résumé

Non-calcifying photosynthetic anthozoans have emerged as a group that may thrive under high carbon dioxide partial pressure (pCO(2)) conditions via increased productivity. However, the physiological mechanisms underlying this potential success are unclear. Here we investigated the impact of high pCO(2) on the dissolved inorganic carbon (DIC) use in the temperate sea anemone Anemonia viridis. We assessed the impacts of long-term exposure to high pCO(2), 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 pCO(2) had no impact on Symbiodinium density and chlorophyll a content. In contrst, short-term exposure to high pCO(2) 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 pCO(2), 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.
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Dates et versions

hal-01546163 , version 1 (23-06-2017)

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Patricia Ventura, Michael D. Jarrold, Pierre-Laurent Merle, Stephanie Barnay-Verdier, Thamilla Zamoum, et al.. Resilience to ocean acidification: decreased carbonic anhydrase activity in sea anemones under high pCO(2) conditions. Marine Ecology Progress Series, 2016, 559, pp.257-263. ⟨10.3354/meps11916⟩. ⟨hal-01546163⟩
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