<![CDATA[Samsam swamp is located in the peat swamp area and flooded during rainy season. To understand the types and abundance of phytoplankton present in that swamp, a study has been conducted in March 2016. There were four sampling sites, namely S1 is in the upstream (almost no human activity); S2 ( around palm plantation); S3 (around the newly planted palm plantation) and S4 (far from palm plantation). Water sampler were taken once/week for 3 week period. Results shown that there are 21 species of phytoplankton present in the swamp. They were classified into three classes, `namely: Bacillariophyceae (12 species), Chloropyhceae (6 species) and Cyanophyceae (3 species). The average of phytoplankton abundance was around 2,804 – 4,135 cells/L. While the water quality parameters were as follows: temperature: 30 - 320C, transparency: 30 - 40 cm, depth: 83 - 114 cm, pH: 4 - 5, CO2: 8.66 - 9.32 mg/L, DO: 3.96 - 4.65mg/L, nitrate: 0.45 - 0.58 mg/L and phosphate: 0.36 - 0.56 mg/L. Based on the abundance of pyhtoplankton, it can be concluded that the Samsam peat swamp water can be categorized as oligotrophic.Keyword : Phytoplankton, Samsam Peat Swamp, Water Quality and Oligotrophic]]>
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