Seawater chemistry, nutrients, chlorophyll a, and growth rate of Phaeocystis globosa during experiments, supplement to: Hoogstraten, Astrid; Peters, M; Timmermans, Klaas R; de Baar, Hein J W (2012): Combined effects of inorganic carbon and light on Phaeocystis globosa Scherffel (Prymnesiophyceae). Biogeosciences, 9(5), 1885-1896


Phaeocystis globosa (Prymnesiophyceae) is an ecologically dominating phytoplankton species in many areas around the world. It plays an important role in both the global sulfur and carbon cycles, by the production of dimethylsulfide (DMS) and the drawdown of inorganic carbon. Phaeocystis globosa has a polymorphic life cycle and is considered to be a harmful algal bloom (HAB) forming species. All these aspects make this an interesting species to study the effects of increasing carbon dioxide (CO2) concentrations, due to anthropogenic carbon emissions.Here, the combined effects of three different dissolved carbon dioxide concentrations (CO2(aq)) (low: 4 µmol/kg, intermediate: 6-10 µmol/kg and high CO2(aq): 21-24 µmol/kg) and two different light intensities (low light, suboptimal: 80 µmol photons/m2/s and high light, light saturated: 240 µmol photons/m2/s) are reported. The experiments demonstrated that the specific growth rate of P. globosa in the high light cultures decreased with increasing CO2(aq) from 1.4 to 1.1 /d in the low and high CO2 cultures, respectively. Concurrently, the photosynthetic efficiency (Fv/Fm) increased with increasing CO2(aq) from 0.56 to 0.66. The different light conditions affected photosynthetic efficiency and cellular chlorophyll a concentrations, both of which were lower in the high light cultures as compared to the low light cultures. These results suggest that in future inorganic carbon enriched oceans, P. globosa will become less competitive and feedback mechanisms to global change may decrease in strength.

Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see

Related Identifier
Metadata Access
Creator Hoogstraten, Astrid; Peters, M; Timmermans, Klaas R; de Baar, Hein J W
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2012
Funding Reference Seventh Framework Programme, 211384
Rights Creative Commons Attribution 3.0 Unported;
OpenAccess true
Language English
Resource Type Supplementary Collection of Datasets; Collection
Format application/zip
Size 6 datasets
Discipline Earth System Research