How does rising atmospheric CO2 affect marine organisms?

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Berre Lagoon, France
Robert, C., Degiovanni, C., Jaubert, R., Leroy, V., Reyss, J.L., Saliège, J.F., Thouveny, N. and de Vernal, A. 2006. Variability of sedimentation and environment in the Berre coastal lagoon (SE France) since the first millennium: Natural and anthropogenic forcings. Journal of Geochemical Exploration 88: 440-444.

Mineral and microfossil assemblages from a sediment core taken from the Berre coastal lagoon in southeast France (~ 43.44°N, 5.10°E) were analyzed in an effort to reconstruct environmental changes in the region over the past 1500 years. The MWP was identified as an interval of higher kaolinite content between AD 980 and 1370, which was judged to be indicative of "increased chemical weathering in relation to higher temperatures and/or precipitation." In addition, the concentration of microfossils of the thermophilic taxon Spiniferites bentorii peaked during this period, which combined evidence leads us to conclude that the MWP was warmer than the CWP at Bette lagoon.