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

• Main Authors: Holtmann, Wiebke C, Stumpp, Meike, Gutowska, Magdalena A, Syre, Stephanie, Himmerkus, Nina, Melzner, Frank, Bleich, Markus
• Format: Dataset
• Language: English
• Published: PANGAEA 2015
• Subjects: Biological Impacts of Ocean Acidification BIOACID; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.843068; https://doi.pangaea.de/10.1594/PANGAEA.843068

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 ... : Supplement to: Holtmann, Wiebke C; Stumpp, Meike; Gutowska, Magdalena A; Syre, Stephanie; Himmerkus, Nina; Melzner, Frank; Bleich, Markus (2013): Maintenance of coelomic fluid pH in sea urchins exposed to elevated CO2: the role of body cavity epithelia and stereom dissolution. Marine Biology, 160(10), 2631-2645 ...