Effects of long-term high CO 2 exposure on two species of coccolithophores

The physiological performance of two coc- colithophore species, Emiliania huxleyi and Coccolithus braarudii, was investigated during long-term exposure to elevated pCO2 levels. Mono-specific cultures were grown over 152 (E. huxleyi) and 65 (C. braarudii) generations while pCO2 was gradually increased to maximum levels of 1150 µatm (E. huxleyi) and 930 µatm (C. braarudii) and kept constant thereafter. Rates of cell growth and cell quotas of particulate organic carbon (POC), particulate inorganic car- bon (PIC) and total particulate nitrogen (TPN) were deter- mined repeatedly throughout the incubation period. Increas- ing pCO2 caused a decrease in cell growth rate of 9% and 29% in E. huxleyi and C. braarudii, respectively. In both species cellular PIC:TPN and PIC:POC ratios decreased in response to rising pCO2, whereas no change was observed in the POC:TPN ratios of E. huxleyi and C. braarudii. These results are consistent with those obtained in shorter-term high CO2 exposure experiments following abrupt pertuba- tions of the seawater carbonate system and indicate that for the strains tested here a gradual CO2 increase does not alle- viate CO2/pH sensitivity.

• Publication year

  2009

• Venue

  Biogeosciences

• Publication date

  2009-11-24

• Fields of study

  Chemistry, Environmental Science

• Identifiers
  DOI 10.5194/BG-7-1109-2010
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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