The response of Emiliania huxleyi (Lohmann) W.W. Hay et H. Mohler, Calcidiscus leptoporus (G. Murray et V. H. Blackman) J. Schiller, and Syracosphaera pulchra Lohmann to elevated partial pressure of carbon dioxide (pCO(2)) was investigated in batch cultures. We reported on the response of both haploid and diploid life stages of these three species. Growth rate, cell size, particulate inorganic carbon (PIC), and particulate organic carbon (POC) of both life stages were measured at two different pCO(2) (400 and 760 parts per million [ppm]), and their organic and inorganic carbon production were calculated. The two life stages within the same species generally exhibited a similar response to elevated pCO(2), the response of the haploid stage being often more pronounced than that of the diploid stage. The growth rate was consistently higher at elevated pCO(2), but the response of other processes varied among species. Calcification rate of C. leptoporus and of S. pulchra did not change at elevated pCO(2), whereas it increased in E. huxleyi. POC production and cell size of both life stages of S. pulchra and of the haploid stage of E. huxleyi markedly decreased at elevated pCO(2). It remained unaltered in the diploid stage of E. huxleyi and C. leptoporus and increased in the haploid stage of the latter. The PIC:POC ratio increased in E. huxleyi and was constant in C. leptoporus and S. pulchra. Elevated pCO(2) has a significant effect on these three coccolithophore species, the haploid stage being more sensitive. This effect must be taken into account when predicting the fate of coccolithophores in the future ocean.
- carbon dioxide
- climate change
- haploid and diploid life stage
- ocean acidification
- EMILIANIA-HUXLEYI PRYMNESIOPHYCEAE
- SEAWATER CARBONATE CHEMISTRY
- INCREASED ATMOSPHERIC CO2
- INORGANIC CARBON
- OCEAN ACIDIFICATION
- MARINE PLANKTON
[Fiorini, Sarah] Univ Ctr Natl Rech Sci, Inst Natl Sci, Lab Oceanog Villefranche, F-06234 Villefranche Sur Mer, France; [Fiorini, Sarah; Gattuso, Jean-Pierre] Univ Paris 06, Observ Oceanol Villefranche Mer, F-06234 Villefranche Sur Mer, France; [Fiorini, Sarah; Middelburg, Jack J.] Netherlands Inst Ecol NIOO KNAW, NL-4400 AC Yerseke, Netherlands; [Middelburg, Jack J.] Univ Utrecht, Fac Geosci, NL-3508 TA Utrecht, Netherlands; [Fiorini, Sarah; Gattuso, Jean-Pierre] Int Atom Energy Agcy Marine Environm Lab, Monaco 98000, Monaco
Fiorini, S (reprint author), Int Atom Energy Agcy Marine Environm Lab, 4 Quai Antoine Ler, MC-98000 Monaco, Monaco.
- Laboratoire d'océanographie de Villefranche (LOV), UMR7093
- Observatoire océanologique de Villefranche-sur-mer, UMS829