Effects of increased CO2 and temperature on the growth of four diatom species (Chaetoceros debilis, Chaetoceros didymus, Skeletonema costatum and Thalassiosira nordenskioeldii) in laboratory experiments

We examined the combined impacts of future increases of CO2 and temperature on the growth of four marine diatoms (Skeletonema costatum, Chaetoceros debilis, Chaetoceros didymus, Thalassiosira nordenskioeldii). The four strains were incubated under four different conditions: present (pCO2: 400ppm, temperature: 20℃), acidification (pCO2: 1000ppm, temperature: 20℃), global warming (pCO2: 400ppm, temperature: 25℃), and greenhouse (pCO2: 1000ppm, temperature: 25℃) conditions. Under the condition of higher temperatures, growth of S. costatum was suppressed, while C. debilis showedenhanced growth. Both C. didymus and T. nodenskioldii showed similar growth rates under current and elevated temperature.None of the four species appeared affected in their cell growth by elevated CO2 concentrations. Chetoceros spp. showedincrease of pH per unit fluorescence under elevated CO2 concentrations, but no difference in pH from that under currentconditions was observed for either S. costatum or T. nodenskioeldii, implying that Chetoceros spp. can take up more CO2 per cell than the other two diatoms. Our results of cell growth and pH change per unit fluorescence suggest that both C. debilis and C. didymus are better adapted to future oceanic conditions of rising water temperature and CO2 than are S. costatum and T. nodenskioeldii.

Hyun B., Choi K.-H., Jang P.-G., Jang M.-C., Lee W.-J., Moon C.-H. & Shin K., 2014. Effects of increased CO2 and temperature on the growth of four diatom species (Chaetoceros debilis, Chaetoceros didymus,Skeletonema costatum and Thalassiosira nordenskioeldii) in laboratory experiments. Journal of Environmental Science International 23 (6): 1003-1012. Article.


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