Effects of Elevated pCO2 on a Tidal Pool Coralline Alga
Egilsdottir, H., Noisette, F., Noel, L.M.-L.J., Olafson, J. and Martin, S. 2013. Effects of pCO2 on physiology and skeletal mineralogy in a tidal pool coralline alga Corallina elongata. Marine Biology 160: 2103-2112.
"To test this hypothesis," in the words of Egilsdottir et al., "the effect of elevated pCO2 was investigated in the articulated coralline red alga Corallina elongata from an intertidal rock pool on the north coast of Brittany (France), where pCO2 naturally varied daily between 70 and 1000 µatm." This was done by growing the algae at four different pCO2 values (380, 550, 750 and 1000 µatm) in laboratory mesocosms and measuring several different physiological responses of the coral.
Based on their analysis, the French and Icelandic researchers report that "algae grown under elevated pCO2 formed fewer new structures and produced calcite with a lower mMg/Ca ratio relative to those grown under 380 µatm." However, they also report that "respiration, gross primary production and calcification in light and dark were not significantly affected by increased pCO2."
As a result of their several findings, Egilsdottir et al. conclude that their study "supports the assumption that C. elongata from a tidal pool, where pCO2 fluctuates over diel and seasonal cycles, [are] relatively robust to elevated pCO2." And they also thus state that these observations portend "a greater resilience" of such organisms to the projected "highly variable pH/pCO2 environments of future ocean acidification."
Moulin, L., Catarino, A.I., Claessens, T. and Dubois, P. 2011. Effects of seawater acidification on early development of the intertidal sea urchin Paracentrotus lividus (Lamarck 1816). Marine Pollution Bulletin 62: 48-54.
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