Regulation of calcification site pH is a polyphyletic but not always governing response to ocean acidification

Type Article
Date 2020-01
Language English
Author(s) Liu Yi-Wei1, 2, Sutton Jill1, Ries Justin B.3, Eagle Robert A.1, 4, 5
Affiliation(s) 1 : Université de Brest, UBO, CNRS, IRD, Ifremer, Institut Universitaire Européen de la Mer, LEMAR, Rue Dumont d’Urville, 29280 Plouzané, France.
2 : Institute of Earth Sciences, Academia Sinica, 128, Sec. 2, Academia Road, Nangang, Taipei 11529, Taiwan.
3 : Department of Marine and Environmental Sciences, Marine Science Center, Northeastern University, 430 Nahant Rd., Nahant, MA 01908, USA.
4 : Institute of the Environment and Sustainability, University of California–Los Angeles, La Kretz Hall, 619 Charles E. Young Dr. E #300, Los Angeles, CA 90095, USA.
5 : Atmospheric and Oceanic Sciences Department, University of California–Los Angeles, Math Sciences Building, 520 Portola Plaza, Los Angeles, CA 90095, USA.
Source Science Advances (2375-2548) (American Association for the Advancement of Science (AAAS)), 2020-01 , Vol. 6 , N. 5 , P. eaax1314 (9p.)
DOI 10.1126/sciadv.aax1314
Abstract

The response of marine-calcifying organisms to ocean acidification (OA) is highly variable, although the mechanisms behind this variability are not well understood. Here, we use the boron isotopic composition (δ11B) of biogenic calcium carbonate to investigate the extent to which organisms’ ability to regulate pH at their site of calcification (pHCF) determines their calcification responses to OA. We report comparative δ11B analyses of 10 species with divergent calcification responses (positive, parabolic, threshold, and negative) to OA. Although the pHCF is closely coupled to calcification responses only in 3 of the 10 species, all 10 species elevate pHCF above pHsw under elevated pCO2. This result suggests that these species may expend additional energy regulating pHCF under future OA. This strategy of elevating pHCF above pHsw appears to be a polyphyletic, if not universal, response to OA among marine calcifiers—although not always the principal factor governing a species’ response to OA.

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