Basic research for solutions on global climate change using microbial loop

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In Lake Sanaru, Shizuoka Prefecture, Japan, annual cyclic blooms of Synechococcus spp. (small planktonic algae) occur during summer. We studied on environmental condition favorable to growth of Synechococcus and grazing loss of Synechococcus by protists. We finally discussed the reduction of atmospheric CO2 concentration through food chain between Synechococcus which fixes CO2 through photosynthesis and heterotrophic flagellates which prey on Synechococcus. Growth of Synechococcus was stimulated by nitrogen supply. Grazing loss of Synechococcus by the flagellates agreed well with production of Synechococcus. Atmospheric CO2 thus would be effectively consumed through the food chain between Synechococcus with nitrogen supply and heterotrophic flagellates.