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Chlorophyll-a, an active pigment found in phytoplankton, is an indicator of phytoplankton biomass and can be used as an indicator of tropic level status of a waters. Dumai River estuary, a transition zone between river and maritime environments of Rupat Strait, are subject both to marine influences, such as tides, waves, and the influx of saline water, and to riverine influences, such as flows of fresh water and sediment. The mixing of sea water and fresh water provide high levels of nutrients both in the water column and in sediment, making estuaries among the most productive natural habitats in the world. The number of surrounding industrial and domestic activities can lead to changes in the ecosystem of the estuary. This study aims to assess the distribution of chlorophyll and tropical level status of the waters of the estuary of Dumai River. It was noted that the the content of chlorophyll-a Dumai River estuary ranges from 0.75 to 2.26 ug/l, in which the highest level was at station 3. Based on tropical level criteria, the waters of Dumai River estuary is indicated as oligotropic to mesotropic waters, meaning that these waters are less productive.

Tropic Level Status of Dumai River Esutuary Based on Chlorophyll-Content