Ocean acidification enhances the growth rate of larger diatoms

被引:134
作者
Wu, Yaping [1 ,2 ]
Campbell, Douglas A. [1 ]
Irwin, Andrew J. [1 ]
Suggett, David J. [3 ]
Finkel, Zoe V. [1 ]
机构
[1] Mt Allison Univ, Math & Comp Sci, Environm Sci, Sackville, NB, Canada
[2] Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen, Peoples R China
[3] Univ Essex, Sch Biol Sci, Colchester CO4 3SQ, Essex, England
基金
中国国家自然科学基金;
关键词
CO2-CONCENTRATING MECHANISM; CONCENTRATING MECHANISMS; PHYTOPLANKTON COMMUNITY; MARINE-PHYTOPLANKTON; CELL-SIZE; CO2; LIGHT; PHOTOSYNTHESIS; AVAILABILITY; PLANKTON;
D O I
10.4319/lo.2014.59.3.1027
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Ocean acidification is changing the nature of inorganic carbon availability in the global oceans. Diatoms account for similar to 40% of all marine primary productivity and are major contributors to the export of atmospheric carbon to the deep ocean. Larger diatoms are more likely to be stimulated by future increases in CO2 availability as a result of their low surface area to volume ratio and lower diffusive flux of CO2 relative to their carbon demand for growth. Here we quantify the effect of the partial pressure of carbon dioxide (PCO2), at levels of 190, 380, and 750 mu L L-1, on the growth rate, photosystem II electron transport rate (ETR), and elemental composition for five diatom species ranging over five orders of magnitude in cell volume. Growth rates for all species were enhanced under 750 relative to 190 and 380 mu L L-1, with little change in ETR or elemental stoichiometries, indicating an enhanced allocation of photochemical energy to growth under elevated PCO2. PCO2 enhancement of growth rates was size dependent. Under 750 vs. 190 mu L L-1 partial pressures, growth rate was enhanced by similar to 5% for the smaller diatom species to similar to 30% for the largest species examined. The size dependence of CO2-stimulated growth enhancement indicates that ocean acidification may selectively favor an increase in the growth rates of larger vs. smaller phytoplankton species in the sea, with potentially significant consequences for carbon biochemistry.
引用
收藏
页码:1027 / 1034
页数:8
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