Abstract
Year-to-year variability in the structure of the preserved siliceous phytoplankton assemblage is reconstructed from a box core retrieved from the varved sediments along the Guaymas slope of the Gulf of California. A 20-year record from 1953 through 1972 is obtained from interpretation of the varve stratigraphy supported by 210Pb and 228Th dating. Ecological time series derived from microfossil analysis show a strong coherence with interannual sea-level anomalies indicating a response to large-scale climatic variability associated with the El Niño/Southern Oscillation phenomenon. El Niño periods are generally marked by increases in preserved abundances of the total siliceous assemblage and in particular by greater numbers of individuals within species whose distribution is limited to tropical and subtropical waters.
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