Decreased calcification to photosynthesis ratio in coccolithophores under reduced O2 and elevated CO2 environment

文献类型： 外文期刊

第一作者： Tong, Shanying

作者： Tong, Shanying;Qiao, Hongjin;Xu, Dong;Ye, Naihao;Xu, Dong;Ye, Naihao;Xu, Dong;Ye, Naihao

作者机构：

关键词： coccolithophore; high CO2; low O2; photosynthesis; calcification

期刊名称：CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES （ 影响因子：2.4； 五年影响因子：2.5 ）

ISSN： 0706-652X

年卷期： 2023 年

页码：

收录情况： SCI

摘要： We examined the physiological performance in the most cosmopolitan coccolithophorid, Emiliania huxleyi and Gephyrocapsa oceanica, which were treated with 8.3 (ambient O2 (AO)), 4.6 (medium O2 (MO)), and 2.5 (low O2 (LO)) mg L-1 O2 under 400 ppm (ambient CO2 (AC)) and 1000 (high CO2 (HC)) ppm CO2 conditions. Elevated CO2 decreased the specific growth rate of cells cultured under AO and LO conditions in both species, but it increased the rate in the MO-grown E. huxleyi. Regardless of the CO2 levels, diminished O2 concentration inhibited the growth rate in E. huxleyi while accelerating the rate in G. oceanica. LO reduced the particulate organic carbon (POC) production rate compared to the AO treatment in both species. Additionally, the decrease was higher in the HC cultures than in the AC ones. LO also inhibited the production rate of particulate inorganic carbon (PIC) compared to the AO/AC treatment. Due to a higher reduction in the production rate of PIC than POC, the PIC/POC ratio was decreased in the LO treatment compared to the AO/AC treatment. The current study reveals that low O2 can, individually or in combination with high CO2, considerably affect the physiology of marine photoautotrophic organisms.

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