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We determined cell density and dominant species of eukaryotic phytoplankton, chlorophyll concentration and primary production in the Changjiang estuary and dilution zone in January and July 1986. In winter, phytoplankton was dominated by small cells (< 10 pm), closely associated to particulate matter. In summer, the most striking feature of chlorophyll and primary production distributions was the presence of sharp maxima localized about 100 km offshore at salinities between 25 and 30 960 and related to diatom populations. The critical factor responsible for these maxima was the increased light avadability following sedimentation of the particulate matter oriqnating from the river, as observed in front of other major world rivers such as the Zaire and the Amazon. This photosynthetic activity resulted in high oxygen concentrations and phosphate depletion in the surface layer. In both seasons, in situ area1 productivity and light availability were related by a simple empirical relationship similar to that established for other medium-sized estuaries.

Standing stock and production of phytoplankton in the estuary of the Chang-jiang (Yangste River) and the adjacent East China Sea