North Atlantic Copepods Exposed to Very Acidified Seawater
Pedersen, S.A., Hansen, B.H., Altin, D. and Olsen, A.J. 2013. Medium-term exposure of the North Atlantic copepod Calanus finmarchicus (Gunnerus, 1770) to CO2-acidified seawater: effects on survival and development. Biogeosciences 10: 7481-7491.
In describing their findings, the four Norwegian researchers report (1) "following the 28-day exposure period, survival was found to be unaffected by exposure to 3300 ppm CO2, but significantly reduced at 7300 and 9700 ppm CO2," (2) "the proportion of copepodite stages IV to VI observed in the different treatments was significantly affected in a manner that may indicate a CO2-induced retardation of the rate of ontogenetic development," and (3) "morphometric analysis revealed a significant increase in size (prosome length) and lipid storage volume in stage IV copepodites exposed to 7300 ppm CO2."
In light of these several findings, Pedersen et al. write, in the concluding paragraph of their paper, that "the absence of any apparent reduction in the overall survival during the present medium-term exposure to 3300 ppm CO2, indicates that survival of Calanus eggs and nauplii may be robust against the direct effects of the worst-case CO2 scenario predicted for year 2300."
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