| Lei Xinming,Jiang Lei,Zhang Yuyang,Zhou Guowei,Lian Jiansheng,Huang Hui. 2020. Response of coralline algae Porolithon onkodes to elevated seawater temperature and reduced pH. Acta Oceanologica Sinica, 39(2):132－137 |
| Response of coralline algae Porolithon onkodes to elevated seawater temperature and reduced pH |
| 珊瑚藻-孔石藻（Porolithon onkodes）对海水温度升高与pH值降低的响应 |
| Received:September 19, 2018 |
| DOI：10.1007/s13131-020-1548-6 |
| Key words:crustose coralline algae response elevated temperature reduced pH effects |
| 中文关键词: 壳状珊瑚藻(CCA) 响应 升温 pH值降低 效应 |
| 基金项目:The National Natural Science Foundation of China (NSFC) under contract Nos 41306144 and 41676150; the National Key Research and Development Plan under contract No. 2017YFC0506301; the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDA13020402; the Guangdong Basic and Applied Basic Research Foundation under contract No. 2019A1515011532. |
| Author Name | Affiliation | E-mail | | Lei Xinming | CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China | | | Jiang Lei | CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China | | | Zhang Yuyang | CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China | | | Zhou Guowei | CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
CAS Tropical Marine Biological Research Station in Hainan, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Sanya 572000, China | | | Lian Jiansheng | CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China | | | Huang Hui | CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China
CAS Tropical Marine Biological Research Station in Hainan, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Sanya 572000, China | huanghui@scsio.ac.cn |
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| Abstract: |
| Coralline algae (CA), a type of primary calcifying producer presented in coastal ecosystems, are considered one of the highly sensitive organisms to marine environmental change. However, experimental studies on coralline algae responses to elevated seawater temperature and reduced pH have documented either contradictory or opposite results. In this study, we analysed the growth and physiological responses of coralline algae Porolithon onkodes to the elevated temperature (30.8℃) and reduced pH (7.8). The aim of this analysis was to observe the direct and combined effects, while elucidating the growth and photosynthesis in this response. It was demonstrated that the algae thallus growth rate and photosynthesis under elevated temperature were depressed by 21.5% and 14.9% respectively. High pCO2 enhanced the growth and photosynthesis of the thallus at ambient temperature, while they were deceased when both temperature and pCO2 were elevated. CA is among the most sensitive organisms to ocean acidification (OA) because of their precipitate high Mg-calcite. We hypothesize that coralline algae could increase their calcification rate in order to counteract the effects of moderate acidification, but offset by the effect of elevated temperature. Accordingly, our results also support the conclusion that global warming (GW) is a stronger threat to algal performance than OA. Our findings are also proposed that coralline algae may be more resilient under OA than GW. |
| 中文摘要: |
| 珊瑚藻（Coralline Algae，CA）是海岸生态系统中的一类主要的钙化生物，也是对海洋环境变化高度敏感的生物之一。然而，有关珊瑚藻对海水升温和pH值降低的响应实验研究结果要么相互矛盾，要么结果相反。本研究分析了孔石藻（Poroliton onkodes）在升温（30.8℃）和低pH值（7.8）下的生长和生理响应。本研究主要目的是为了观测海水升温与酸化条件的直接作用和综合效应，同时阐明珊瑚藻的的生长和光合作用响应。结果表明，升温条件下珊瑚藻体生长速率和光合作用分别降低了21.5%和14.9%。较高的CO2分压（pCO2）能促进藻体的生长和光合作用，而海水温度与CO2分压均升高时藻体死亡。珊瑚藻因其体内沉积淀高镁方解石使其成为对海洋酸化（OA）最敏感的生物之一。本文推论出珊瑚藻采用增加其钙化速率以抵消中度酸化的影响，但这种效应被高温的影响抵消。因此，本文研究结果支持了全球变暖比酸化对珊瑚藻造成威胁更大的结论。本文结果 也表明珊瑚藻在海洋酸化条件下比全球变暖更具有恢复弹力 |
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