Data from: Evolutionary responses of a coccolithophorid Gephyrocapsa oceanica to ocean acidification

The ongoing ocean acidification associated with a changing carbonate system may impose profound effects on marine planktonic calcifiers. Here, we show that a coccolithophore, Gephyrocapsa oceanica, evolved in response to an elevated CO2 concentration of 1000 μatm (pH reduced to 7.8) in a long term (∼ 670 generations) selection experiment. The high CO2 selected cells showed increases in photosynthetic carbon fixation, growth rate, cellular particulate organic carbon (POC) or nitrogen (PON) production and a decrease in C:N elemental ratio, indicating a greater up-regulation of PON than of POC production under the ocean acidification condition. Cells from the low CO2 selection process shifted to high CO2 exposure showed an enhanced cellular POC and PON production rates. Our data suggest that the coccolithophorid could adapt to ocean acidification with enhanced assimilations of carbon and nitrogen but decreased C:N ratios.持续伴随碳酸盐系统动态变化的海洋酸化，可能对海洋浮游钙化生物产生深远影响。本研究通过为期约670代的长期选择实验，证实颗石藻（coccolithophore）物种海洋桥石藻（Gephyrocapsa oceanica）可响应1000 μatm的升高CO₂浓度（pH降至7.8）发生适应性演化。经高CO₂环境筛选获得的细胞，其光合固碳速率、生长速率、细胞颗粒有机碳（Particulate Organic Carbon, POC）与颗粒有机氮（Particulate Organic Nitrogen, PON）的合成量均显著提升，而C:N元素比值出现下降，这表明在海洋酸化条件下，细胞对PON合成的上调幅度高于POC。原本经低CO₂环境筛选的细胞，在转移至高CO₂环境后，其细胞POC与PON的合成速率均得到增强。本研究数据表明，颗石藻可通过增强碳、氮同化作用适应海洋酸化，但其C:N比值会出现下降。