How does rising atmospheric CO2 affect marine organisms?

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Southern Okinawa Trough, East China Sea
Li, D., Knudsen, M.F., Jiang, H., Olsen, J., Zhao, M., Li, T., Knudsen, K.L., Seidenkrantz, M.-S. and Sha, L. 2012. A diatom-based reconstruction of summer sea-surface salinity in the Southern Okinawa Trough, East China Sea, over the last millennium. Journal of Quaternary Science 27: 771-779.

Li et al. developed a summer sea-surface salinity (SSS) reconstruction for the Southern Okinawa Trough based on a high-resolution diatom record they obtained from a sediment core located at 24°48.04'N, 122°29.35'E in the East China Sea. This reconstruction revealed the existence of certain "palaeoclimatic and paleoenvironmental changes in the area over the last millennium at multidecadal to centennial time scales," which indicated that "high-salinity conditions generally prevailed during the Medieval Climate Anomaly (MCA)," which they identified as occurring over the period AD 905-1450.