Effect of carbonate ion concentration and irradiance on calcification in planktonic foraminifera (update)

The effect of carbonate ion concentration ([CO32−]) on calcification rates estimated from shell size and weight was investigated in the planktonic foraminifera Orbulina universa and Globigerinoides sacculifer. Experiments on G. sacculifer were conducted under two irradiance levels (35 and 335 μmol photons m−2 s−1). Calcification was ca. 30% lower under low light than under high light, irrespective of the [CO32−]. Both O. universa and G. sacculifer exhibited reduced final shell weight and calcification rate under low [CO32−]. For the [CO32−] expected at the end of the century, the calcification rates of these two species are projected to be 6 to 13% lower than the present conditions, while the final shell weights are reduced by 20 to 27% for O. universa and by 4 to 6% for G. sacculifer. These results indicate that ocean acidification would impact on calcite production by foraminifera and may decrease the calcite flux contribution from these organisms.



Lombard, F., da Rocha, R. E., Bijma, J., & Gattuso, J.-P., 2010. Effect of carbonate ion concentration and irradiance on calcification in planktonic foraminifera. Biogeosciences 7(1): 247-255. Article.

0 Responses to “Effect of carbonate ion concentration and irradiance on calcification in planktonic foraminifera (update)”



  1. Leave a Comment

Leave a Reply




				
  • Search

  • Categories

  • Tags

  • Post Date

Subscribe to the RSS feed

Follow AnneMarin on Twitter

Blog Stats

  • 1,407,416 hits

OA-ICC HIGHLIGHTS

Ocean acidification in the IPCC AR5 WG II

OUP book


%d bloggers like this: