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    The impact of seawater saturation state and bicarbonate ion concentration on calcification by new recruits of two Atlantic corals

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    de_Putron_et_al_saturation_state_and_coral_calcification_Nov 5_edited-with-table&figures.pdf (384.3Kb)
    Date
    2010-11-05
    Author
    de Putron, Samantha J.  Concept link
    McCorkle, Daniel C.  Concept link
    Cohen, Anne L.  Concept link
    Dillon, A. B.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4641
    As published
    https://doi.org/10.1007/s00338-010-0697-z
    Keyword
     Coral; Calcification; Ocean acidification; Recruitment; Carbonate ion 
    Abstract
    Rising concentrations of atmospheric CO2 are changing the carbonate chemistry of the oceans, a process known as ocean acidification (OA). Absorption of this CO2 by the surface oceans is increasing the amount of total dissolved inorganic carbon (DIC) and bicarbonate ion (HCO3 -) available for marine calcification, yet is simultaneously lowering the seawater pH and carbonate ion concentration ([CO3 2-]), and thus the saturation state of seawater with respect to aragonite (Ωar). We investigated the relative importance of [HCO3 -] versus [CO3 2-] for early calcification by new recruits (primary polyps settled from zooxanthellate larvae) of two tropical coral species, Favia fragum and Porites astreoides. The polyps were reared over a range of Ωar values, which were manipulated by both acid-addition at constant pCO2 (decreased total [HCO3 -] and [CO3 2-]) and by pCO2 elevation at constant alkalinity (increased [HCO3 -], decreased [CO3 2-]). Calcification after two weeks was quantified by weighing the complete skeleton (corallite) accreted by each polyp over the course of the experiment. Both species exhibited the same negative response to decreasing [CO3 2-] whether Ωar was lowered by acid-addition or by pCO2 elevation - calcification did not follow total DIC or [HCO3 -]. Nevertheless, the calcification response to decreasing [CO3 2-] was non-linear. A statistically significant decrease in calcification was only detected between Ωar = < 2.5 and Ωar = 1.1 – 1.5, where calcification of new recruits was reduced by 22 – 37 % per 1.0 decrease in Ωar. Our results differ from many previous studies that report a linear coral calcification response to OA, and from those showing that calcification increases with increasing [HCO3 -]. Clearly, the coral calcification response to OA is variable and complex. A deeper understanding of the biomineralization mechanisms and environmental conditions underlying these 3 variable responses is needed to support informed predictions about future OA impacts on corals and coral reefs.
    Description
    Author Posting. © The Author(s), 2010. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Coral Reefs 30 (2011): 321-328, doi:10.1007/s00338-010-0697-z.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Preprint: de Putron, Samantha J., McCorkle, Daniel C., Cohen, Anne L., Dillon, A. B., "The impact of seawater saturation state and bicarbonate ion concentration on calcification by new recruits of two Atlantic corals", 2010-11-05, https://doi.org/10.1007/s00338-010-0697-z, https://hdl.handle.net/1912/4641
     

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