Diurnally fluctuating pCO(2) modifies the physiological responses of coral recruits under ocean acidification
Jiang, Lei, Quo, Ya-Juan, Zhang, Fang, Zhang, Yu-Yang, McCook, Laurence John, Yuan, Xiang-Cheng, Lei, Xin-Ming, Zhou, Guo-Wei, Guo, Ming-Lan, Cai, Lin, Lian, Jian-Sheng, Qian, Pei-Yuan, and Huang, Hui (2019) Diurnally fluctuating pCO(2) modifies the physiological responses of coral recruits under ocean acidification. Frontiers in Physiology, 9. 1952.
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Abstract
Diurnal pCO(2) fluctuations have the potential to modulate the biological impact of ocean acidification (OA) on reef calcifiers, yet little is known about the physiological and biochemical responses of scleractinian corals to fluctuating carbonate chemistry under OA. Here, we exposed newly settled Pocillopora damicornis for 7 days to ambient pCO(2), steady and elevated pCO(2) (stable OA) and diurnally fluctuating pCO(2) under future OA scenario (fluctuating OA). We measured the photo-physiology, growth (lateral growth, budding and calcification), oxidative stress and activities of carbonic anhydrase (CA), Ca-ATPase and Mg-ATPase. Results showed that while OA enhanced the photochemical performance of in hospite symbionts, it also increased catalase activity and lipid peroxidation. Furthermore, both OA treatments altered the activities of host and symbiont CA, suggesting functional changes in the uptake of dissolved inorganic carbon (DIC) for photosynthesis and calcification. Most importantly, only the fluctuating OA treatment resulted in a slight drop in calcification with concurrent upregulation of Ca-ATPase and Mg-ATPase, implying increased energy expenditure on calcification. Consequently, asexual budding rates decreased by 50% under fluctuating OA. These results suggest that diel pCO(2) oscillations could modify the physiological responses and potentially alter the energy budget of coral recruits under future OA, and that fluctuating OA is more energetically expensive for the maintenance of coral recruits than stable OA.
| Item ID: | 56993 |
|---|---|
| Item Type: | Article (Research - C1) |
| ISSN: | 1664-042X |
| Keywords: | ocean acidification, diurnal pCO(2) fluctuations, coral calcification, carbonic anhydrase, proton pump, trade-off |
| Copyright Information: | © 2019 Jiang, Guo, Zhang, Zhang, McCook, Yuan, Lei, Zhou, Guo, Cai, Lian, Qian and Huang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
| Funders: | Chinese Academy of Sciences (CAS), National Natural Science Foundation of China (NNSFC), Guangdong Province, China (GP) |
| Projects and Grants: | CAS Strategic Priority Research Program XDA13020201, NNSFC U1301232, NNSFC 41676150, NNSFC 41876192, GP Science and Technology Planning Project (2017B0303014052) |
| Date Deposited: | 30 Jan 2019 07:31 |
| FoR Codes: | 41 ENVIRONMENTAL SCIENCES > 4101 Climate change impacts and adaptation > 410102 Ecological impacts of climate change and ecological adaptation @ 100% |
| SEO Codes: | 96 ENVIRONMENT > 9603 Climate and Climate Change > 960301 Climate Change Adaptation Measures @ 100% |
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