 |
| Titel |
Effect of carbonate ion concentration and irradiance on calcification in planktonic foraminifera |
| VerfasserIn |
F. Lombard, R. E. Rocha, J. Bijma, J.-P. Gattuso |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 1 ; Nr. 7, no. 1 (2010-01-19), S.247-255 |
| Datensatznummer |
250004377
|
| Publikation (Nr.) |
 copernicus.org/bg-7-247-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|