How does rising atmospheric CO2 affect marine organisms?

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Lake Kamalété, Central Gabon
Ngomanda, A., Chepstow-Lusty, A., Makaya, M., Schevin, P., Maley, J., Fontugne, M., Oslisly, R., Rabenkogo, N. and Jolly, D. 2005. Vegetation changes during the past 1300 years in western equatorial Africa: a high-resolution pollen record from Lake Kamalété, Lopé Reserve, Central Gabon. The Holocene 15: 1021-1031.

Ngomanda et al. (2005) analyzed a high-resolution sediment core retrieved from Lake Kamalété in the southeast corner of the Lopé Reserve of central Gabon (~ 0.72°S, 11.77°E), producing a record of vegetation changes over the past 1300 years. The results revealed a period of forest regression from ~AD 760-1450 in which the dry season was "more prolonged and more severe" than it is today, indicative of a "wider distribution" of the hydro-thermal "climatic anomaly" that was the MWP than just the mid-latitudes of the Northern Hemisphere.