Marine Biology

, Volume 160, Issue 10, pp 2631–2645

Maintenance of coelomic fluid pH in sea urchins exposed to elevated CO2: the role of body cavity epithelia and stereom dissolution

  • Wiebke C. Holtmann
  • Meike Stumpp
  • Magdalena A. Gutowska
  • Stephanie Syré
  • Nina Himmerkus
  • Frank Melzner
  • Markus Bleich
Original Paper

Abstract

Experimental ocean acidification leads to a shift in resource allocation and to an increased [HCO3] within the perivisceral coelomic fluid (PCF) in the Baltic green sea urchin Strongylocentrotus droebachiensis. We investigated putative mechanisms of this pH compensation reaction by evaluating epithelial barrier function and the magnitude of skeleton (stereom) dissolution. In addition, we measured ossicle growth and skeletal stability. Ussing chamber measurements revealed that the intestine formed a barrier for HCO3 and was selective for cation diffusion. In contrast, the peritoneal epithelium was leaky and only formed a barrier for macromolecules. The ossicles of 6 week high CO2-acclimatised sea urchins revealed minor carbonate dissolution, reduced growth but unchanged stability. On the other hand, spines dissolved more severely and were more fragile following acclimatisation to high CO2. Our results indicate that epithelia lining the PCF space contribute to its acid–base regulation. The intestine prevents HCO3 diffusion and thus buffer leakage. In contrast, the leaky peritoneal epithelium allows buffer generation via carbonate dissolution from the surrounding skeletal ossicles. Long-term extracellular acid–base balance must be mediated by active processes, as sea urchins can maintain relatively high extracellular [HCO3]. The intestinal epithelia are good candidate tissues for this active net import of HCO3 into the PCF. Spines appear to be more vulnerable to ocean acidification which might significantly impact resistance to predation pressure and thus influence fitness of this keystone species.

Supplementary material

227_2013_2257_MOESM1_ESM.pdf (666 kb)
Supplementary material 1 (PDF 665 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Wiebke C. Holtmann
    • 1
  • Meike Stumpp
    • 1
    • 2
    • 3
  • Magdalena A. Gutowska
    • 1
    • 2
  • Stephanie Syré
    • 2
  • Nina Himmerkus
    • 1
  • Frank Melzner
    • 2
  • Markus Bleich
    • 1
  1. 1.Physiologisches InstitutKielGermany
  2. 2.GEOMAR Helmholtz Centre for Ocean Research KielKielGermany
  3. 3.Department of Biological and Environmental Sciences, The Sven Lovén Centre for Marine ScienceUniversity of GothenburgFiskebäckskilSweden

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