Combined effects of inorganic carbon and light on <i>Phaeocystis globosa</i> Scherffel (Prymnesiophyceae)
<i>Phaeocystis globosa</i> (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. <i...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2012-05-01
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| Series: | Biogeosciences |
| Online Access: | http://www.biogeosciences.net/9/1885/2012/bg-9-1885-2012.pdf |
| _version_ | 1831654015685885952 |
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| author | H. J. W. de Baar K. R. Timmermans A. Hoogstraten M. Peters |
| author_facet | H. J. W. de Baar K. R. Timmermans A. Hoogstraten M. Peters |
| author_sort | H. J. W. de Baar |
| collection | DOAJ |
| description | <i>Phaeocystis globosa</i> (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. <i>Phaeocystis globosa</i> 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 (CO<sub>2</sub>) concentrations, due to anthropogenic carbon emissions. <br><br> Here, the combined effects of three different dissolved carbon dioxide concentrations (CO<sub>2(aq))</sub> (low: 4 μmol kg<sup>−1</sup>, intermediate: 6–10 μmol kg<sup>−1</sup> and high CO<sub>2(aq)</sub>: 21–24 μmol kg<sup>−1</sup>) and two different light intensities (low light, suboptimal: 80 μmol photons m<sup>−2</sup> s<sup>−1</sup> and high light, light saturated: 240 μmol photons m<sup>−2</sup> s<sup>−1</sup>) are reported. <br><br> The experiments demonstrated that the specific growth rate of <i>P. globosa</i> in the high light cultures decreased with increasing CO<sub>2(aq)</sub> from 1.4 to 1.1 d<sup>−1</sup> in the low and high CO<sub>2</sub> cultures, respectively. Concurrently, the photosynthetic efficiency (<i>F</i><sub>V</sub>/<i>F</i><sub>M</sub>) increased with increasing CO<sub>2(aq)</sub> from 0.56 to 0.66. The different light conditions affected photosynthetic efficiency and cellular chlorophyll <i>a</i> 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, <i>P. globosa</i> will become less competitive and feedback mechanisms to global change may decrease in strength. |
| first_indexed | 2024-12-19T16:19:32Z |
| format | Article |
| id | doaj.art-974a454a47aa4871b74771dca8051869 |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-12-19T16:19:32Z |
| publishDate | 2012-05-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Biogeosciences |
| spelling | doaj.art-974a454a47aa4871b74771dca80518692022-12-21T20:14:32ZengCopernicus PublicationsBiogeosciences1726-41701726-41892012-05-01951885189610.5194/bg-9-1885-2012Combined effects of inorganic carbon and light on <i>Phaeocystis globosa</i> Scherffel (Prymnesiophyceae)H. J. W. de BaarK. R. TimmermansA. HoogstratenM. Peters<i>Phaeocystis globosa</i> (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. <i>Phaeocystis globosa</i> 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 (CO<sub>2</sub>) concentrations, due to anthropogenic carbon emissions. <br><br> Here, the combined effects of three different dissolved carbon dioxide concentrations (CO<sub>2(aq))</sub> (low: 4 μmol kg<sup>−1</sup>, intermediate: 6–10 μmol kg<sup>−1</sup> and high CO<sub>2(aq)</sub>: 21–24 μmol kg<sup>−1</sup>) and two different light intensities (low light, suboptimal: 80 μmol photons m<sup>−2</sup> s<sup>−1</sup> and high light, light saturated: 240 μmol photons m<sup>−2</sup> s<sup>−1</sup>) are reported. <br><br> The experiments demonstrated that the specific growth rate of <i>P. globosa</i> in the high light cultures decreased with increasing CO<sub>2(aq)</sub> from 1.4 to 1.1 d<sup>−1</sup> in the low and high CO<sub>2</sub> cultures, respectively. Concurrently, the photosynthetic efficiency (<i>F</i><sub>V</sub>/<i>F</i><sub>M</sub>) increased with increasing CO<sub>2(aq)</sub> from 0.56 to 0.66. The different light conditions affected photosynthetic efficiency and cellular chlorophyll <i>a</i> 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, <i>P. globosa</i> will become less competitive and feedback mechanisms to global change may decrease in strength.http://www.biogeosciences.net/9/1885/2012/bg-9-1885-2012.pdf |
| spellingShingle | H. J. W. de Baar K. R. Timmermans A. Hoogstraten M. Peters Combined effects of inorganic carbon and light on <i>Phaeocystis globosa</i> Scherffel (Prymnesiophyceae) Biogeosciences |
| title | Combined effects of inorganic carbon and light on <i>Phaeocystis globosa</i> Scherffel (Prymnesiophyceae) |
| title_full | Combined effects of inorganic carbon and light on <i>Phaeocystis globosa</i> Scherffel (Prymnesiophyceae) |
| title_fullStr | Combined effects of inorganic carbon and light on <i>Phaeocystis globosa</i> Scherffel (Prymnesiophyceae) |
| title_full_unstemmed | Combined effects of inorganic carbon and light on <i>Phaeocystis globosa</i> Scherffel (Prymnesiophyceae) |
| title_short | Combined effects of inorganic carbon and light on <i>Phaeocystis globosa</i> Scherffel (Prymnesiophyceae) |
| title_sort | combined effects of inorganic carbon and light on i phaeocystis globosa i scherffel prymnesiophyceae |
| url | http://www.biogeosciences.net/9/1885/2012/bg-9-1885-2012.pdf |
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