How does rising atmospheric CO2 affect marine organisms?

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Jacaf Fjord, Northern Patagonia, Chile
Sepulveda, J., Pantoja, S., Hughen, K.A., Bertrand, S., Figueroa, D., Leon, T., Drenzek, N.J. and Lange, C. 2009. Late Holocene sea-surface temperature and precipitation variability in northern Patagonia, Chile (Jacaf Fjord, 44S). Quaternary Research 72: 400-409.

The authors derived alkenone-based spring/summer sea-surface temperatures (SSTs) from a marine sedimentary record obtained from Jacaf Fjord in northern Chilean Patagonia (4420.00'S, 7258.15'W) that spanned the last 1750 years; and in doing so they observed two different regimes of climate variability in their record: "a relatively dry/warm period before 900 cal yr BP (higher runoff and average SST 1C warmer than present day) and a wet/cold period after 750 cal yr BP (higher runoff and average SST 1C colder than present day)," which they associated with the Medieval Warm Period and Little Ice Age, respectively.