Distinguishing between the effects of ocean acidification and ocean carbonation in the coccolithophore Emiliania huxleyi
The coccolithophore Emiliania huxleyi was cultured under a broad range of carbonate chemistry conditions to distinguish the effects of individual carbonate system parameters on growth, primary production, and calcification. In the first experiment, alkalinity was kept constant and the fugacity of CO...
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Online Access: | https://oceanrep.geomar.de/id/eprint/12665/ https://oceanrep.geomar.de/id/eprint/12665/1/2040.pdf https://doi.org/10.4319/lo.2011.56.6.2040 |
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ftoceanrep:oai:oceanrep.geomar.de:12665 2023-05-15T17:51:37+02:00 Distinguishing between the effects of ocean acidification and ocean carbonation in the coccolithophore Emiliania huxleyi Bach, Lennart T. Riebesell, Ulf Schulz, Kai 2011 text https://oceanrep.geomar.de/id/eprint/12665/ https://oceanrep.geomar.de/id/eprint/12665/1/2040.pdf https://doi.org/10.4319/lo.2011.56.6.2040 en eng ASLO (Association for the Sciences of Limnology and Oceanography) https://oceanrep.geomar.de/id/eprint/12665/1/2040.pdf Bach, L. T. , Riebesell, U. and Schulz, K. (2011) Distinguishing between the effects of ocean acidification and ocean carbonation in the coccolithophore Emiliania huxleyi. Open Access Limnology and Oceanography, 56 (6). pp. 2040-2050. DOI 10.4319/lo.2011.56.6.2040 <https://doi.org/10.4319/lo.2011.56.6.2040>. doi:10.4319/lo.2011.56.6.2040 info:eu-repo/semantics/openAccess Article PeerReviewed 2011 ftoceanrep https://doi.org/10.4319/lo.2011.56.6.2040 2023-04-07T15:01:05Z The coccolithophore Emiliania huxleyi was cultured under a broad range of carbonate chemistry conditions to distinguish the effects of individual carbonate system parameters on growth, primary production, and calcification. In the first experiment, alkalinity was kept constant and the fugacity of CO2 (fCO2) varied from 2 to 600 Pa (1 Pa ≈ 10 µatm). In the second experiment, pH was kept constant (pHfree = 8) with fCO2 varying from 4 to 370 Pa. Results of the constant-alkalinity approach revealed physiological optima for growth, calcification, and organic carbon production at fCO2 values of ∼ 20 Pa, ∼ 40 Pa, and ∼ 80 Pa, respectively. Comparing this with the constant-pH approach showed that growth and organic carbon production increased similarly from low to intermediate CO2 levels but started to diverge towards higher CO2 levels. In the high CO2 range, growth rates and organic carbon production decreased steadily with declining pH at constant alkalinity while remaining consistently higher at constant pH. This suggests that growth and organic carbon production rates are directly related to CO2 at low (sub-saturating) concentrations, whereas towards higher CO2 levels they are adversely affected by the associated decrease in pH. A pH dependence at high fCO2 is also indicated for calcification rates, while the key carbonate system parameter determining calcification at low fCO2 remains unclear. These results imply that key metabolic processes in coccolithophores have their optima at different carbonate chemistry conditions and are influenced by different parameters of the carbonate system at both sides of the optimum. Article in Journal/Newspaper Ocean acidification OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Limnology and Oceanography 56 6 2040 2050 |
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English |
description |
The coccolithophore Emiliania huxleyi was cultured under a broad range of carbonate chemistry conditions to distinguish the effects of individual carbonate system parameters on growth, primary production, and calcification. In the first experiment, alkalinity was kept constant and the fugacity of CO2 (fCO2) varied from 2 to 600 Pa (1 Pa ≈ 10 µatm). In the second experiment, pH was kept constant (pHfree = 8) with fCO2 varying from 4 to 370 Pa. Results of the constant-alkalinity approach revealed physiological optima for growth, calcification, and organic carbon production at fCO2 values of ∼ 20 Pa, ∼ 40 Pa, and ∼ 80 Pa, respectively. Comparing this with the constant-pH approach showed that growth and organic carbon production increased similarly from low to intermediate CO2 levels but started to diverge towards higher CO2 levels. In the high CO2 range, growth rates and organic carbon production decreased steadily with declining pH at constant alkalinity while remaining consistently higher at constant pH. This suggests that growth and organic carbon production rates are directly related to CO2 at low (sub-saturating) concentrations, whereas towards higher CO2 levels they are adversely affected by the associated decrease in pH. A pH dependence at high fCO2 is also indicated for calcification rates, while the key carbonate system parameter determining calcification at low fCO2 remains unclear. These results imply that key metabolic processes in coccolithophores have their optima at different carbonate chemistry conditions and are influenced by different parameters of the carbonate system at both sides of the optimum. |
format |
Article in Journal/Newspaper |
author |
Bach, Lennart T. Riebesell, Ulf Schulz, Kai |
spellingShingle |
Bach, Lennart T. Riebesell, Ulf Schulz, Kai Distinguishing between the effects of ocean acidification and ocean carbonation in the coccolithophore Emiliania huxleyi |
author_facet |
Bach, Lennart T. Riebesell, Ulf Schulz, Kai |
author_sort |
Bach, Lennart T. |
title |
Distinguishing between the effects of ocean acidification and ocean carbonation in the coccolithophore Emiliania huxleyi |
title_short |
Distinguishing between the effects of ocean acidification and ocean carbonation in the coccolithophore Emiliania huxleyi |
title_full |
Distinguishing between the effects of ocean acidification and ocean carbonation in the coccolithophore Emiliania huxleyi |
title_fullStr |
Distinguishing between the effects of ocean acidification and ocean carbonation in the coccolithophore Emiliania huxleyi |
title_full_unstemmed |
Distinguishing between the effects of ocean acidification and ocean carbonation in the coccolithophore Emiliania huxleyi |
title_sort |
distinguishing between the effects of ocean acidification and ocean carbonation in the coccolithophore emiliania huxleyi |
publisher |
ASLO (Association for the Sciences of Limnology and Oceanography) |
publishDate |
2011 |
url |
https://oceanrep.geomar.de/id/eprint/12665/ https://oceanrep.geomar.de/id/eprint/12665/1/2040.pdf https://doi.org/10.4319/lo.2011.56.6.2040 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
https://oceanrep.geomar.de/id/eprint/12665/1/2040.pdf Bach, L. T. , Riebesell, U. and Schulz, K. (2011) Distinguishing between the effects of ocean acidification and ocean carbonation in the coccolithophore Emiliania huxleyi. Open Access Limnology and Oceanography, 56 (6). pp. 2040-2050. DOI 10.4319/lo.2011.56.6.2040 <https://doi.org/10.4319/lo.2011.56.6.2040>. doi:10.4319/lo.2011.56.6.2040 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.4319/lo.2011.56.6.2040 |
container_title |
Limnology and Oceanography |
container_volume |
56 |
container_issue |
6 |
container_start_page |
2040 |
op_container_end_page |
2050 |
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1766158813792043008 |