Ocean acidification, due to increased levels of anthropogenic carbon dioxide, is known to affect the physiology and growth of marine phytoplankton, especially in polar regions. However, the effect of acidification or carbonation on cellular metabolism in polar marine phytoplankton still remains an open question. There is some evidence that small chlorophytes may benefit more than other taxa of phytoplankton. To understand further how green polar picoplankton could acclimate to high oceanic CO2, studies were conducted on an Antarctic Chlorella sp. Chlorella sp. maintained its growth rate (∼0.180 d-1), photosynthetic quantum yield (Fv/Fm = ∼0.69) and chlorophyll a (0.145 fg cell-1) and carotenoid (0.06 fg cell-1) contents under high CO2, while maximum rates of electron transport decreased and non-photochemical quenching increased under elevated CO2. GCMS-based metabolomic analysis reveal that this polar Chlorella strain modulated the levels of metabolites associated with energy, amino acid, fatty acid and carbohydrate production, which could favour its survival in an increasingly acidified ocean.

中文翻译：

---

用代谢组学方法研究海洋酸化对极地微藻小球藻的影响。

众所周知，由于人为二氧化碳含量的增加，海洋酸化会影响海洋浮游植物的生理和生长，特别是在极地地区。然而，酸化或碳酸化对极地海洋浮游植物中细胞代谢的影响仍然是一个悬而未决的问题。有证据表明，小型绿藻可能比浮游植物的其他类群受益更多。为了进一步了解绿色极地浮游生物如何适应高海洋二氧化碳，对南极小球藻进行了研究。小球藻 在高CO2浓度下保持最大生长速率（〜0.180 d-1），光合量子产率（Fv / Fm = 〜0.69）和叶绿素a（0.145 fg cell-1）和类胡萝卜素（0.06 fg cell-1）含量CO 2浓度升高时，电子传输的速率降低，非光化学猝灭速率增加。