Hall-Spencer, JM

Rodolfo-Metalpa, R

English

PEARL (Univ. of Plymouth)

School of Biological and Marine Sciences Faculty of Science and Engineering 2011-06-20 Corals, bryozoans and gastropods are able to calcify in acidified seawater JM Hall-Spencer School of Biological and Marine Sciences R Rodolfo-Metalpa Let us know how access to this document benefits you General rights All content in PEARL is protected by copyright law. Author manuscripts are made available in accordance with publisher policies. Please cite only the published version using the details provided on the item record or document. In the absence of an open licence (e.g. Creative Commons), permissions for further reuse of content should be sought from the publisher or author. Take down policy If you believe that this document breaches copyright please contact the library providing details, and we will remove access to the work immediately and investigate your claim. Follow this and additional works at: https://pearl.plymouth.ac.uk/bms-research Recommended Citation Hall-Spencer, J., & Rodolfo-Metalpa, R. (2011) 'Corals, bryozoans and gastropods are able to calcify in acidified seawater', Default journal, . Retrieved from https://pearl.plymouth.ac.uk/bms-research/420 This Article is brought to you for free and open access by the Faculty of Science and Engineering at PEARL. It has been accepted for inclusion in School of Biological and Marine Sciences by an authorized administrator of PEARL. For more information, please contact openresearch@plymouth.ac.uk. AvH7-477th Alexander von Humboldt International ConferencePenang, Malaysia, June 20-24, 2011© Author(s) 2011Corals, bryozoans and gastropods are able to calcify in acidified seawaterR. Rodolfo-Metalpa and J.M. Hall-SpencerUniversity of Plymouth, Drake Circus, Plymouth PL4 8AA, United Kingdom (riccardo@rodolfo-metalpa.com)Increasing atmospheric carbon dioxide (pCO2) concentrations are causing ocean acidification, lowering surfaceocean pH and carbonate ion concentrations. This is thought to be the cause of dramatic decreases in calcificationrates of several marine organisms such as molluscs and corals during the course of this century. We transplantedbryozoans, corals and gastropods near volcanic vents (Ischia, Italy) where CO2 emitted from the seafloor acidifiesthe water column mimicking future scenarios in a natural environment. Calcification and dissolution rates weremeasured after long-term in situ acclimation. Although early life history stages are vulnerable (Cligliano et al.,2010), we found that adults were able to calcify at pH levels projected in the next 300 years although the acidifi-cation dissolves shells and skeletons. Calcification and protective mechanisms in the range of species investigatedindicates that they are more resilient to ocean acidification than previously thought. Boron isotopic composition ofcoral grown both in aquaria at pHT 7.8 and at CO2 vents showed that pH at the site of calcification was regulatedby the animal and allowed calcification even in undersaturated seawater (Trotter et al., 2011). Calcification occursbetween the tissue and the shell or skeleton where extrapallial fluid (in molluscs) and extracellular calcifying fluid(in corals) pH is 0.5 to > 1 unit higher than in ambient seawater. Therefore, empirical relationships between sea-water carbonate state and calcification can not be used alone to predict the effects of ocean acidification on marinespecies. To predict the response of marine calcifiers to ocean acidification similar work is needed to broaden ourunderstanding of the biological mechanisms of biomineralization.Cigliano M., et al. 2010. Effects of ocean acidification on invertebrate settlement at natural volcanic CO2 vents.Marine Biology 157: 2489-2502.Trotter J, et al. 2011. Quantifying the pH ‘vital effect’ in the temperate zooxanthellate coral Cladocora caespitosa:Validation of the boron seawater pH proxy. Earth and Planetary Science Letters 303: 163-173.

Corals, bryozoans and gastropods are able to calcify in acidified seawater

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Corals, bryozoans and gastropods are able to calcify in acidified seawater

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