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Zvýšená koncentrace CO2 zvýší fixaci dusíku a růst mořské sinice Trichodesmium IMS101
 Levitan, O. ; Prášil, Ondřej ; Berman-Frank, I.
Anthropogenic increases in atmospheric pCO2 over the last century are accompanied by higher concentrations of CO2 (aq) in the surface oceans. These changes could influence aquatic primary production including cyanobacterial nitrogen-fixers via the coupling between photosynthesis and nitrogen-fixation. We hypothesized that elevated pCO2 levels may enhance nitrogen fixation and photosynthesis in the bloom-forming, diazotrophic, cyanobacterium Trichodesmium spp. that contributes greatly to primary production in the oligotrophic subtropical and tropical oceans. We acclimated cultures of Trichodesmium IMS101 to 3 pCO2s (pre-industrial -250 ppmv, current - 400, future -900 ppmv) and examined changes in morphology, photosynthesis, nitrogen fixation, and growth. High pCO2 enhanced growth, filament length and nitrogen fixation of Trichodesmium in comparison with both ambient and low pCO2 acclimated cultures
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