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Population-specific responses in physiological rates of Emiliania huxleyi to a broad CO<sub>2</sub> range

Population-specific responses in physiological rates of Emiliania huxleyi to a broad CO2 range

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ZHANG, Yong, Lennart T. BACH, Kai T. LOHBECK, Kai G. SCHULZ, Luisa LISTMANN, Regina KLAPPER, Ulf RIEBESELL, 2018. Population-specific responses in physiological rates of Emiliania huxleyi to a broad CO2 range. In: Biogeosciences. European Geosciences Union (EGU). 15(12), pp. 3691-3701. ISSN 1726-4170. eISSN 1726-4189. Available under: doi: 10.5194/bg-15-3691-2018

@article{Zhang2018-06-19Popul-56362, title={Population-specific responses in physiological rates of Emiliania huxleyi to a broad CO2 range}, year={2018}, doi={10.5194/bg-15-3691-2018}, number={12}, volume={15}, issn={1726-4170}, journal={Biogeosciences}, pages={3691--3701}, author={Zhang, Yong and Bach, Lennart T. and Lohbeck, Kai T. and Schulz, Kai G. and Listmann, Luisa and Klapper, Regina and Riebesell, Ulf} }

Riebesell, Ulf Zhang, Yong Listmann, Luisa Bach, Lennart T. Although coccolithophore physiological responses to CO<sub>2</sub>-induced changes in seawater carbonate chemistry have been widely studied in the past, there is limited knowledge on the variability of physiological responses between populations from different areas. In the present study, we investigated the specific responses of growth, particulate organic (POC) and inorganic carbon (PIC) production rates of three populations of the coccolithophore Emiliania huxleyi from three regions in the North Atlantic Ocean (Azores: six strains, Canary Islands: five strains, and Norwegian coast near Bergen: six strains) to a CO<sub>2</sub> partial pressure (pCO<sub>2</sub>) range from 120 to 2630 µatm. Physiological rates of each population and individual strain increased with rising pCO<sub>2</sub> levels, reached a maximum and declined thereafter. Optimal pCO<sub>2</sub> for growth, POC production rates, and tolerance to low pH (i.e., high proton concentration) was significantly higher in an E. huxleyi population isolated from the Norwegian coast than in those isolated near the Azores and Canary Islands. This may be due to the large environmental variability including large pCO<sub>2</sub> and pH fluctuations in coastal waters off Bergen compared to the rather stable oceanic conditions at the other two sites. Maximum growth and POC production rates of the Azores and Bergen populations were similar and significantly higher than that of the Canary Islands population. This pattern could be driven by temperature–CO<sub>2</sub> interactions where the chosen incubation temperature (16 ∘C) was slightly below what strains isolated near the Canary Islands normally experience. Our results indicate adaptation of E. huxleyi to their local environmental conditions and the existence of distinct E. huxleyi populations. Within each population, different growth, POC, and PIC production rates at different pCO<sub>2</sub> levels indicated strain-specific phenotypic plasticity. Accounting for this variability is important to understand how or whether E. huxleyi might adapt to rising CO<sub>2</sub> levels. 2022-01-26T10:26:29Z Attribution 4.0 International 2018-06-19 Schulz, Kai G. 2022-01-26T10:26:29Z Lohbeck, Kai T. Zhang, Yong eng Schulz, Kai G. Population-specific responses in physiological rates of Emiliania huxleyi to a broad CO<sub>2</sub> range Klapper, Regina Riebesell, Ulf Klapper, Regina Lohbeck, Kai T. Listmann, Luisa Bach, Lennart T.

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