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Aquatic CO2 assimilation results in storage in the oceans of ~24% of anthropogenic CO2 (~40 petagrams per annum) released into the atmosphere and makes significant contributions to the global carbon cycle.These processes are executed predominantly in phytoplankton in the oceans (including cyanobacteria), which account for nearly 50% of global primary productivity (~50 gigatons per annum) (Field et al., 1998).