Diatom performance in a future ocean: interactions between nitrogen limitation, temperature, and CO2-induced seawater acidification

被引:32
|
作者
Li, Futian [1 ]
Beardall, John [1 ,2 ]
Gao, Kunshan [1 ]
机构
[1] Xiamen Univ, Coll Ocean & Earth Sci, Dept Marine Biol Sci & Technol, State Key Lab Marine Environm Sci, Xiangan South Rd, Xiamen 361102, Peoples R China
[2] Monash Univ, Sch Biol Sci, Wellington Rd, Clayton, Vic 3800, Australia
基金
中国国家自然科学基金;
关键词
CO2; diatom; growth; nitrogen availability; photosynthesis; phytoplankton; temperature; Thalassiosira pseudonana; HALF-SATURATION CONSTANTS; MARINE PRIMARY PRODUCERS; THALASSIOSIRA-PSEUDONANA; ELEVATED CO2; DIFFERENT NUTRIENT; CARBON-DIOXIDE; PHOTOPHYSIOLOGICAL RESPONSES; PHYSIOLOGICAL-RESPONSES; ULTRAVIOLET-RADIATION; EMILIANIA-HUXLEYI;
D O I
10.1093/icesjms/fsx239
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Phytoplankton cells living in the surface waters of oceans are experiencing alterations in environmental conditions associated with global change Given their importance in global primary productivity, it is of considerable concern to know how these organisms will perform physiologically under the changing levels of pH, temperatures, and nutrients predicted for future oceanic ecosystems. Here we show that the model diatom, Thalassiosira pseudonana, when grown at different temperatures (20 or 24 degrees C), pCO(2) (400 or 1000 mu atm), and nitrate concentrations (2.5 or102.5 mu moll(1)), displayed contrasting performance in its physiology. Elevated pCO(2) (and hence seawater acidification) under the nitrate-limited conditions led to decreases in specific growth rate, cell size, pigment content, photochemical quantum yield of PSII, and photosynthetic carbon fixation. Furthermore, increasing the temperature exacerbated the negative effects of the seawater acidification associated with elevated pCO(2) on specific growth rate and chlorophyll content under the N-limited conditions These results imply that a reduced upward transport of nutrients due to enhanced stratification associated with ocean warming might act synergistically to reduce growth and carbon fixation by diatoms under progressive ocean acidification, with important ramifications for ocean productivity and the strength of the biological CO2 pump.
引用
收藏
页码:1451 / 1464
页数:14
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