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Research Article

Reduced calcification and lack of acclimatization by coral colonies growing in areas of persistent natural acidification

Elizabeth D. Crook, Anne L. Cohen, Mario Rebolledo-Vieyra, Laura Hernandez, and Adina Paytan
  1. aInstitute of Marine Sciences, University of California, Santa Cruz, CA 95064;
  2. bDepartment of Marine Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543; and
  3. cUnidad de Ciencias del Agua, Centro de Investigación Científica de Yucatán, Cancún, Quintana Roo, Mexico, 77524

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PNAS first published June 17, 2013; https://doi.org/10.1073/pnas.1301589110
Elizabeth D. Crook
aInstitute of Marine Sciences, University of California, Santa Cruz, CA 95064;
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Anne L. Cohen
bDepartment of Marine Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543; and
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Mario Rebolledo-Vieyra
cUnidad de Ciencias del Agua, Centro de Investigación Científica de Yucatán, Cancún, Quintana Roo, Mexico, 77524
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Laura Hernandez
cUnidad de Ciencias del Agua, Centro de Investigación Científica de Yucatán, Cancún, Quintana Roo, Mexico, 77524
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Adina Paytan
aInstitute of Marine Sciences, University of California, Santa Cruz, CA 95064;
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  • For correspondence: apaytan@ucsc.edu
  1. Edited by David M. Karl, University of Hawaii, Honolulu, HI, and approved May 23, 2013 (received for review January 28, 2013)

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Abstract

As the surface ocean equilibrates with rising atmospheric CO2, the pH of surface seawater is decreasing with potentially negative impacts on coral calcification. A critical question is whether corals will be able to adapt or acclimate to these changes in seawater chemistry. We use high precision CT scanning of skeletal cores of Porites astreoides, an important Caribbean reef-building coral, to show that calcification rates decrease significantly along a natural gradient in pH and aragonite saturation (Ωarag). This decrease is accompanied by an increase in skeletal erosion and predation by boring organisms. The degree of sensitivity to reduced Ωarag measured on our field corals is consistent with that exhibited by the same species in laboratory CO2 manipulation experiments. We conclude that the Porites corals at our field site were not able to acclimatize enough to prevent the impacts of local ocean acidification on their skeletal growth and development, despite spending their entire lifespan in low pH, low Ωarag seawater.

  • reef framework
  • caribbean corals acidic springs

Footnotes

  • ↵1To whom correspondence should be addressed. E-mail: apaytan{at}ucsc.edu.
  • Author contributions: E.D.C. and A.P. designed research; E.D.C., A.L.C., M.R.-V., L.H., and A.P. performed research; A.L.C., M.R.-V., L.H., and A.P. contributed new reagents/analytic tools; E.D.C., A.L.C., and A.P. analyzed data; and E.D.C., A.L.C., and A.P. wrote the paper.

  • The authors declare no conflict of interest.

  • This article is a PNAS Direct Submission.

  • This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1301589110/-/DCSupplemental.

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Corals do not acclimate to ocean acidification
Elizabeth D. Crook, Anne L. Cohen, Mario Rebolledo-Vieyra, Laura Hernandez, Adina Paytan
Proceedings of the National Academy of Sciences Jun 2013, 201301589; DOI: 10.1073/pnas.1301589110

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Corals do not acclimate to ocean acidification
Elizabeth D. Crook, Anne L. Cohen, Mario Rebolledo-Vieyra, Laura Hernandez, Adina Paytan
Proceedings of the National Academy of Sciences Jun 2013, 201301589; DOI: 10.1073/pnas.1301589110
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