Kualitas Air Rawa Jombor Klaten, Jawa Tengah Berdasarkan Komunitas Fitoplankton

Abstract

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 8,846

Ind/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.