How does rising atmospheric CO2 affect marine organisms?

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Florida Everglades, USA
Willard, D.A., Holmes, C.W. and Weimer, L.M. 2001. The Florida Everglades Ecosystem: Climatic and Anthropogenic Impacts over the Last Two Millennia. In Wardlaw, B.R. (ed), Paleoecology of South Florida. Bulletins of American Paleontology 361: 41-55.

The authors examined pollen records from a series of sediment cores obtained in the Florida Everglades (~25.22N, 80.64W) in an effort to reconstruct a vegetational/hydrologic history of the Everglades ecosystem over the past two thousand years. Results of their study revealed centennial-scale intervals of relatively wet and dry conditions. Of particular interest for our purposes was a period of shallow water with a greater abundance of weedy annuals between the 9th and 13th centuries that suggested "rapid drying or prolonged droughts," which findings, the authors note, are "consistent with a broader regional pattern of warmer, drier conditions during the Medieval Warm Period."