Effects of Ocean Acidification on Juvenile Arctic Pteropods
Comeau, S., Alliouane, S. and Gattuso, J.-P. 2012. Effects of ocean acidification on overwintering juvenile Arctic pteropods Limacina helicina. Marine Ecology Progress Series 456: 279-284.
In doing so the three researchers found that pH did not impact the mortality of the pteropods; but they note that the degree of linear extension of their shells decreased as pH declined. Nevertheless, they discovered that the pteropods were able to extend their shells at an aragonite saturation state as low as 0.6, which led them to speculate that "the presence of a thin periostracal layer covering the calcareous surface, as shown on the Antarctic pteropod Limacina helicina antarctica (Sato-Okoshi et al., 2010), might, among other mechanisms, protect the shell from a corrosive environment."
Although much remains to be known about pteropod responses to a potential decline in seawater pH, it would appear that they already possess a certain degree of adaptability to low pH levels; and the results of many similar studies of other calcifying sea creatures suggest that, like them, pteropods may be able to evolve in their ability to successfully cope with declining seawater pH at a rate commensurate with realistic rates of ocean acidification, especially within the context of the acidification analysis of Tans (2009).
Hunt, B., Pakhomov, E., Hosie, G., Siegel, V., Ward, P. and Bernard, K. 2008. Pteropods in Southern Ocean ecosystems. Progress in Oceanography 78: 193-221.
Sato-Okoshi, W., Okoshi, K., Sasaki, H. and Akiha, F. 2010. Shell structure characteristics of pelagic and benthic molluscs from Antarctic waters. Polar Science 4: 257-261.
Tans, P. 2009. An accounting of the observed increase in oceanic and atmospheric CO2 and an outlook for the future. Oceanography 22: 26-35.