Wu Yangyang, Tian Wenfei, Chen Chunxing, Ye Quanqing, Yang Liu, Jiang Jiaoyun
Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Ministry of Education, Guilin 541004, China.
College of Life Sciences, Guangxi Normal University, Guilin 541004, China.
Animals (Basel). 2022 Aug 31;12(17):2259. doi: 10.3390/ani12172259.
Ocean acidification and warming are two of the most important threats to the existence of marine organisms and are predicted to co-occur in oceans. The present work evaluated the effects of acidification (AC: 24 ± 0.1 °C and 900 μatm CO), warming (WC: 30 ± 0.1 °C and 450 μatm CO), and their combination (CC: 30 ± 0.1 °C and 900 μatm CO) on the sea anemone, , from the aspects of photosynthetic apparatus (maximum quantum yield of photosystem II (PS II), chlorophyll level, and Symbiodiniaceae density) and sterol metabolism (cholesterol content and total sterol content). In a 15-day experiment, acidification alone had no apparent effect on the photosynthetic apparatus, but did affect sterol levels. Upregulation of their chlorophyll level is an important strategy for symbionts to adapt to high partial pressure of CO (CO) However, after warming stress, the benefits of high CO had little effect on stress tolerance in . Indeed, thermal stress was the dominant driver of the deteriorating health of . Cholesterol and total sterol contents were significantly affected by all three stress conditions, although there was no significant change in the AC group on day 3. Thus, cholesterol or sterol levels could be used as important indicators to evaluate the impact of climate change on cnidarians. Our findings suggest that might be relatively insensitive to the impact of ocean acidification, whereas increased temperature in the future ocean might impair viability of .
海洋酸化和变暖是对海洋生物生存最重要的两大威胁，预计将在海洋中同时出现。本研究从光合机构（光系统II（PS II）的最大量子产率、叶绿素水平和共生藻密度）和甾醇代谢（胆固醇含量和总甾醇含量）方面，评估了酸化（AC：24±0.1°C和900μatm CO）、变暖（WC：30±0.1°C和450μatm CO）及其组合（CC：30±0.1°C和900μatm CO）对海葵的影响。在为期15天的实验中，单独酸化对光合机构没有明显影响，但确实影响了甾醇水平。共生体上调叶绿素水平是其适应高二氧化碳分压（CO）的重要策略。然而，在变暖胁迫后，高CO的益处对其抗逆性影响不大。事实上，热胁迫是其健康状况恶化的主要驱动因素。所有三种胁迫条件均显著影响胆固醇和总甾醇含量，尽管AC组在第3天没有显著变化。因此，胆固醇或甾醇水平可作为评估气候变化对刺胞动物影响的重要指标。我们的研究结果表明，海葵可能对海洋酸化的影响相对不敏感，而未来海洋温度升高可能会损害海葵的生存能力。
