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

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• 作者：Dong Xu ; Yitao Wang ; Xiao Fan ; Dongsheng Wang ; Naihao Ye ; Xiaowen Zhang ; Shanli Mou ; Zheng Guan ; Zhimeng Zhuang
• 刊名：Environmental Science & Technology
• 出版年：2014
• 出版时间：July 15, 2014
• 年：2014
• 卷：48
• 期：14
• 页码：7738-7746
• 全文大小：417K
• ISSN：1520-5851

文摘

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 cycles. Elevated pCO₂ 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 pCO₂ in darkness. However, long-term culture under high pCO₂ 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.