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Recent studies on the acidification of the oceans suggest that when it increases, calcification decreases, affecting the formation of carbonate shells and skeletons of certain organisms. The coccolithophores are one group of phytoplankton that could be affected by this situation. In Bahia de La Paz, this group has been studied in the water column and the sediment (in a sediment trap) since January 2002. In this paper, the taxonomic composition of coccolithophore species and cell density in the water column in winter and summer of 2008 in Cuenca Alfonso (24°40.0'N, 110°36.7'W). About 1- to 4-L seawater was collected every 15 m from the surface to 75-m depth using Nuclepore membranes (0.8 ?m). The highest densities of total coccolithophores occurred in the first 15-m depth (9 x103 cells / L). Of the 23 identified species belonging to 8 families, Emiliania huxleyi and Gephyrocapsa oceanica were the dominant species. Recent studies indicate that the calcification and net primary production of E. huxleyi has increased in response to the increased atmospheric partial pressure of CO2. Expanding the knowledge we have of this species will provide further information on their role in the oceanic biogeochemistry.

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