<![CDATA[Phytoplankton have an important role in the aquatic ecosystem as a primary producer. Phytoplankton sensitive to the environmental changes, therefore might be used as bioindicators of water quality. Rawa Jombor water conditions have changed as a result of the direct influence of the surrounding community activities or indirect effect such a change of land use. The purpose of this research was to examine the composition, abundance, diversity, and evenness of phytoplankton in Rawa Jombor, assess the level of water pollution Rawa Jombor based on saprobic index and assess water quality Rawa Jombor by phytoplankton as a bioindicator. Determination of sampling points purposive random sampling. Sampling using plankton net no.25, and observation of the sample under the microscope 400 magnification. Temperature, pH, brightness, turbidity and conductivity is still relatively good conditions for phytoplankton, while the value of the DO indicates the quality of waters classified as heavily polluted. The species composition of phytoplankton in Rawa Jombor are 21 types of 5 divisions (Bacillariophyte, Chlorophyte, Cyanophyte, Chrysophyte, and Euglenophyte), and is dominated by the division Cyanophyte. Species found in the entire station is Anabaena sp, Anabaena flos-aquae, Anabaena spiroides, Cylindrospermopsis raciborskii, Microcystis aeruginosa and Gonium pectorale. The highest abundance at STA 5 with 21,137 Ind/L and the lowest at STA 7 with 8,846Ind/L. Shannon-Wiener diversity index ranged from 0.84 to 1.47, evenness index ranged from 0.35 to 0.59, dominance index ranged from 0.34 to 0.63, and the saprobic index ranges between (-2.48) - (- 2.87). Thoses value indicates that Rawa Jombor relatively heavy pollution. Keywords: Water quality, Community, Phytoplankton, Rawa Jombor.]]>
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