Long-Term Experiment on Physiological Responses to Synergetic Effects of Ocean Acidification and Photoperiod in the Antarctic Sea Ice Algae Chlamydomonas sp ICE-L

文献类型： 外文期刊

第一作者： Xu, Dong

作者： Xu, Dong;Fan, Xiao;Ye, Naihao;Zhang, Xiaowen;Mou, Shanli;Zhuang, Zhimeng;Wang, Yitao;Wang, Dongsheng;Guan, Zheng

作者机构：

期刊名称：ENVIRONMENTAL SCIENCE & TECHNOLOGY （ 影响因子：9.028； 五年影响因子：9.922 ）

ISSN： 0013-936X

年卷期： 2014 年 48 卷 14 期

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收录情况： SCI

摘要： Studies on ocean acidification have mostly been based on short-term experiments of low latitude with few investigations of the long-term influence on sea ice communities. Here, the combined effects of ocean acidification and photoperiod on the physiological response of the Antarctic sea ice microalgae Chlamydomonas sp. ICE-L were examined. There was a general increase in growth, PSII photosynthetic parameters, and N and P uptake in continuous light, compared to those exposed to regular dark and light cydes. Elevated pCO(2) showed no consistent effect on growth rate (p = 0.8) and N uptake (p = 0.38) during exponential phrase, depending on the photoperiod but had a positive effect on PSII photosynthetic capacity and P uptake. Continuous dark reduced growth, photosynthesis, and nutrient uptake. Moreover, intracellular lipid, mainly in the form of PUFA, was consumed at 80% and 63% in low and high pCO(2) in darkness. However, long-term culture under high pCO(2) gave a more significant inhibition of growth and F-v/F-m to high light stress. In summary, ocean acidification may have significant effects on Chlamydomonas sp. ICE-L survival in polar winter. The current study contributes to an understanding of how a sea ice algae-based community may respond to global climate change at high latitudes.

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