Browsing by Author "Simarmata, Asmika H"

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    THE DIFFERENCE OF PHYTOPLANKTON ABUNDANCE INSIDE AND OUTSIDE OF FLOATING CAGE IN BANDAR KHAYANGAN RESERVOIR PEKANBARU
    (2014-01-30) Siagian, Madju; Simarmata, Asmika H; Sihotang, C
    This research has been conducted from September – October 2011 in Bandar Khayangan reservoir. This research aims to understand the difference of phytoplankton abundance inside and outside the floating cage in Bandar Khayangan reservoir. Water samples were collected from 3 stations, namely station 1 (in the upstream of the floating cage area), station 2 (in the floating cage area) and station 3 (downstream of the floating cage area). There were 2 sampling sites in each station, in the surface and in 2.5 secchi depth. Sampling was done three times, once a week. Water quality parameters measured were temperature, transparency, pH, DO, CO2, Nitrate and Phosphate. Method used in this research is a survey method. Phytoplankton were sampled using plankton net no 25 and were preserved using lugol 1% and then identifield based on Davis (1955), Prescot (1972), Yunfang (1989), and Yamaji (1995). Result shown that the abundance of phytoplankton range from 10.534 – 42.297 cell/l. The highest of abundance in station 3 (after floating cage) was 42.297 cell/l and the lowest was in the station 1 (before floating cage area) was 10.534 cell/l. Water quality parameter values were as follow: Nitrate, 0.019 – 0.034 mg/l and Phosphate 0.035 – 0.062 mg/l. Based on phytoplankton data, it can be concluded that Bandar Khayangan water can be categorized as mesotrophic.
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    PROFIL VERTIKAL FOSFAT DAN CHLOROPHYL-A SEKITAR KERAMBA JARING APUNG DI DANAU BANDAR KHAYANGAN, PROVINSI RIAU
    (2014-01-30) Simarmata, Asmika H; Siagian, Madju
    A research on vertical profile of Phosphate and Chlorophyl-a around floating cage area in the Bandar Khayangan Reservoir, Riau Province has been conducted on August 2011. This research aims to understand the vertical profile of phosphate and chlorophyll-a and trophic status of the water. Water samples were collected from 3 stations, namely station 1 ( in the upstream of the floating cage area), station 2 (in the floating cage area) and station 3 (downstream of the floating cage area). There were 2 sampling sites in each station, in the surface and in 2.5 secchi depth. Sampling was done three times, once a week. Results shown that Phosphate content in the surface was lower than that of the 2.5 secchi depth. In contrast, the chlorophyl-a in the surface was higher than that of the 2.5 secchi depth. Phosphate content in the surface was ranged from 0.09-0.15 mg/l, in 2.5 secchi depth was 0.09- 0.28 mg/l. Chlorophyll-a in the surface was 16.04-31.55 mg/l and in 2.5 secchi depth was 12.54-21.84 mg/l. Transparency was 53.0-68.3 cm, depth was 1.8-3.51 m, water temperature was 29.6-30.3oC, pH 5.5, dissolved oxygen was 4.5-6.0 mg/l and CO2 was 4.7-8.0 mg/l. Based on data obtained, it can be concluded that the water of the Bandar Khayangan Reservoir was very productive and able to support aquatic organisms living in that dam.
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    Vertical Profile of Oxygen in the Lacustrine and Transition Zones, Koto Panjang Reservoir, Riau Province
    (2016-03-22) Simarmata, Asmika H; Sihotang, M. Siagian and C
    Oxygen concentration in the water is significantly affected by environmental condition. In this research, oxygen concentration in the lacustrine and transition zones of the Koto Panjang reservoir is studied from June to September 2013, it was coincidence with the minimum water level. A post facto survey method was applied and there were 4 sampling sites, in the Lacustrine 1 (L1), Lakustrine 2 (L2), Transition 1 (T1) and Transition 2 (T2). The vertical sampling points were decided based on the brightness of the water (in the surface, 3m, 6 m, 12 m depth and above the sediment in the bottom). The number of vertical sampling sites was depend on the depth of the water. Results shown that the DO concentration in the surface of the lacustrine zone was 6.14 to 8.26 mg/l and in the transition zone was 7.38-8.6 mg/l. In the bottom of the lacustrine zone was 0 to 0.41 mg/l and that of the transition zone was 0.41-3.29 mg/l. The vertical profile of the Dissolved Oxygen in both stations shown that the highest decrement rate of the oxygen occur from 2 secchi depth (3 m) to 4 secchi depth (6 m). In the lacustrine zone, oxygen concentration drop into critical level (< 2 mg/l) in 12 m depth and in this research, the oxic depth was 7.0 m in L1 and 8.0 m in L2. Whereas in T1: 6.2 m and 8.0 m in T2. During the minimum water level, the oxic depth decrease due to decrement of water volume that lead into increment of organic matter loaded.