How does rising atmospheric CO2 affect marine organisms?

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Pickerel Lake, South Dakota, USA
Schwalb, A. and Dean, W.E. 1998. Stable isotopes and sediments from Pickerel Lake, South Dakota, USA: a 12ky record of environmental changes. Journal of Paleolimnology 20: 15-30.

The authors analyzed stable O- and C-isotopic composition and magnetic susceptibility parameters derived from a sediment core extracted from Pickerel Lake, northeastern South Dakota (45.51N, 97.27W), obtaining a record of climate variability for this region during the Holocene, where the MWP was manifest as a peak in magnetic susceptibility, which they felt reflected greater evaporation from windy and drier conditions during this period. Estimates from their Figures 2 and 5 place the MWP between AD 800 and 1100.