期刊
FRONTIERS IN PHYSIOLOGY
卷 9, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fphys.2018.01952
关键词
ocean acidification; diurnal pCO(2) fluctuations; coral calcification; carbonic anhydrase; proton pump; trade-off
类别
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA13020201]
- National Natural Science Foundation of China [U1301232, 41676150, 41876192]
- Science and Technology Planning Project of Guangdong Province, China [2017B0303014052]
- President's International Visiting Expert Professorial Fellowship from the Chinese Academy of Sciences [2016VEA025]
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据