海洋酸化没有显著影响成体鹿角杯形珊瑚的钙化作用和光合能力

郑新庆; 郭富雯; 刘昕明; 林荣澄; 周治东; 施晓峰

doi:10.3969/j.issn.0253-4193.2015.10.006

海洋酸化没有显著影响成体鹿角杯形珊瑚的钙化作用和光合能力

doi: 10.3969/j.issn.0253-4193.2015.10.006

1.
国家海洋局第三海洋研究所, 福建厦门 361005
2.
台湾海洋生物博物馆, 台湾屏东 90001
3.
广西壮族自治区海洋研究院, 广西南宁 530022
4.
福建海洋研究所, 福建厦门 361005

基金项目: 南方海洋中心海洋产业核心和关键技术攻关项目(14CZY037HJ11);福建省重点科技项目(2012Y0071);福建省自然科学基金资助项目(2015J05083,2014J01127);海洋公益性行业科研专项(201105012);广西科技兴海专项项目(GXZC2015-G3-3696-JZ);厦门海洋开发研究院项目(K140301)。

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出版历程
- 收稿日期: 2015-03-25

Ocean acidification does not significantly affect the calcification and photosynthesis capacity of hermatypic coral Pocillopora damicornis

1.
The Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
2.
National Museum of Marine Biology and Aquarium, Pingtung 90001, China
3.
Guanxi Academy of Oceanography, Nanning 530022, China
4.
Fujian Institute of Oceanography, Xiamen 361005, China

摘要

摘要: 工业革命以来,人类活动释放的大量CO₂进入大气层,不仅产生严重的温室效应,也使得全球海洋出现酸化的现象。造礁珊瑚被认为是受海水酸化影响最大的类群。本研究以鹿角杯形珊瑚(Pocillopora damicornis)为研究对象,通过气体交换法模拟未来的酸化环境(2100年)研究鹿角杯形珊瑚的钙化率和光合能力(F_v/F_m)对酸化的响应。实验设置两个pH组(分别为7.8和8.1),自然光下进行4周的实验,水温控制在(27.5±1)℃。由于珊瑚等生物的代谢过程(主要是呼吸作用),实验系统的pH昼夜变化显著,酸化处理组和对照组的pH分别介于7.69~7.91和7.99~8.29。鹿角杯形珊瑚的生长率介于1.15%~2.09%/周,酸化对鹿角杯形珊瑚的钙化率和光合效率没有显著的影响,鹿角杯形珊瑚对酸化的敏感度低。对比历史研究数据,本研究的结果进一步表明酸化对造礁珊瑚的影响存在种的特异性。推测鹿角杯形珊瑚对酸化的抗性可能与该珊瑚在有光的条件下能够利用HCO₃^-以及能够上调钙化位点的pH有关。这种特异性的pH缓冲能力使得珊瑚能维持钙化位点钙质基质高的文石饱和度(Ω_arag),因此能以小的额外能耗提高造礁珊瑚的钙化率。
- 鹿角杯形珊瑚 /
- 酸化 /
- 珊瑚礁 /
- 钙化作用 /
- F_v/F_m
Abstract: Since the industrial revolution,large amounts of CO₂ released by human activities into the atmosphere not only produce serious greenhouse effect,but also cause ocean acidification (OA). Reef-building corals are thought to the most sensitive to ocean acidification. Ocean acidification is predicted to impact the physiology of corals and reduce the calcification rates. In the present study,the calcification and photosynthesis capacity (F_v/F_m) of hermatypic coral Pocillopora damicornis was measured to study the physiological effect of OA by the simulation of further scenario of ocean acidification based on the gas exchange method. The experiment was conducted for 5 weeks in natural light with the seawater temperature controlled at 27.5℃ (±1℃) by the chiller. Two pH values (7.8 and 8.1,respectively) were set by pH regulation,which mediate the CO₂ gas into experimental seawater. The diurnal variation of pH during the experiment was observed,with the pH values varied from 7.69 to 7.91 for the OA treatment and from 7.99 to 8.29 for the control due to the metabolic process (mainly respiration from the organisms). The results showed that the calcification rate of P. damicornis ranged from 1.15%~2.09%·week^-1,and no significant difference was found in calcification and F_v/F_m between OA treatment and the control,indicating the low sensitivity of P. damicornis to OA. Compared to those previous publications,species-specific responses were further confirmed facing to OA. It is speculated that the tolerance of P. damicornis to OA may be due to the use of HCO₃^- in the light and up-regulation of pH in at their site of calcification. The capacity to up-regulate pH may be central to the resilience of P. damicornis to OA because the buffer capacity of pH can maintain relatively high the saturation of aragonite at their site of calcification and thus the calcification of corals at relatively low cost.
- Pocillopora damicornis /
- ocean acidification /
- coral /
- calcification /
- F_v/F_m

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参考文献(44)

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