期刊
MARINE ECOLOGY PROGRESS SERIES
卷 568, 期 -, 页码 47-58出版社
INTER-RESEARCH
DOI: 10.3354/meps12042
关键词
Ocean acidification; Fluctuating light; UV radiation; Coccolithophore; Calcification
资金
- National Natural Science Foundation [41430967]
- national key research programs [2016YFA0601400]
- State Oceanic Administration (National Programme on Global Change and Air-Sea Interaction) [GASI-03-01-02-04]
- Joint project of the National Natural Science Foundation of China and Shandong Province [U1606404]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA1102030204]
Coccolithophores, a globally distributed group of marine phytoplankton, showed diverse responses to ocean acidification (OA) and to combinations of OA with other environmental factors. While their growth can be enhanced and calcification be hindered by OA under constant indoor light, fluctuation of solar radiation with ultraviolet irradiances might offset such effects. In this study, when a calcifying and a non-calcifying strain of Emiliania huxleyi were grown at 2 CO2 concentrations (low CO2 [LC]: 395 atm; high CO2 [HC]: 1000 atm) under different levels of incident solar radiation in the presence of ultraviolet radiation (UVR), HC and increased levels of solar radiation acted synergistically to enhance the growth in the calcifying strain but not in the noncalcifying strain. HC enhanced the particulate organic carbon (POC) and nitrogen (PON) productions in both strains, and this effect was more obvious at high levels of solar radiation. While HC decreased calcification at low solar radiation levels, it did not cause a significant effect at high levels of solar radiation, implying that a sufficient supply of light energy can offset the impact of OA on the calcifying strain. Our data suggest that increased light exposure, which is predicted to happen with shoaling of the upper mixing layer due to progressive warming, could counteract the impact of OA on coccolithophores distributed within this layer.
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