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We determined the ratio of the concentration of dimethylsulfide (DMS) and metabolic precursors, dimethylsulfoniumpropionate (DMSP), in water and particulate samples obtained along the transect through the runoff of the Pangkep and Tallo rivers in the rainy season and the dry season to the open sea. In most cases, we observed a positive correlation between the concentration of biogenic sulfur species and salinity, especially when the concentration of sulfur compounds was measured for chlorophyll as a measure of phytoplankton biomass. Normal concentrations of DMS, dissolved DMSP, and particulate (intracellular) DMSP increase non-linearly with salinity from estuaries. DMS however, is generally highest near the surface and decreases by moving away from the euphotic zone. At the mouth of the Tallo River, runoff dominated by surface water affects the dominance (D) of phytoplankton from the Makassar city river flow, and the reduction of nutrients from the sea cannot be predicted. Pangkep river estuary abundance of phytoplankton is more dominant than the genus Chaetoceros sp. The value of phytoplankton dominance is associated with the decline of organic nutrients from river mouths, this shows that the absorption of phytoplankton is the main surface up weeling process that is responsible for reducing nutrients. The average value of diversity index is 1.11; 0.082 and 0.521 while the value index of diversity, water surface and dominance in the subsurface ocean that is 1.14; 0.088 and 0.55. The result of the distribution of spatial abundance of phytoplankton in the west season and seasons east shows the level of k water surface phytoplankton in the area is different .