In April 1962 the phytoplankton near the Nova Scotian coast was abundant; it decreased southward to St. Thomas. Along the same course a succession of dominant species coincided with changes in hydrography. Spatial succession among the less abundant species further diversified the flora—the
diversity of the section as a whole being three times that of a single sample. A similar diversification is encountered on approaching the South American coast, where upwelling produces an abundance of plankton.
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