COMPARATIVE ANALYSIS OF PHYTOPLANKTON COMMUNITY IN SOME INLAND WATER HABITAT OF CENTRAL KALIMANTAN, INDONESIA
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Analyses of phytoplankton community, species diversity and abundance for different types of inland water habitats were performed. Phytoplankton samples were collected during 1995 to 1997 in oxbow lake systems (Lakes Rengas, Lutan and Takapan), lowland lake (Lake Sembuluh) and river systems in the swamp forest (Tanjung Puting National Park). The analyses show that the dominant genera of phytoplankton were the groups belonging to Chlorophyceae and Bacillariophyceae. This fact was probably related to the acidic conditions (pH 4.42-5.55) at the study sites. The densities of Closterium and Gonaiozygon were high at almost all sites while Spirogyra was dominant in Lakes Lutan and Takapan. The densities of Navicula, Synedra and Tabellaria were high at almost all sites. Rhizosolenia was found only in Lake Sembuluh at high density. The abundance of phytoplankton ranged between 232 to 3260 individuals/l, indicating low productivity of these inland waters. This fact was partly supported by the low dissolved oxygen concentrations (2.62-4.99 mg/l) at the study sites. It seems that there are two habitat types based on the number of phytoplankton genera. Lakes Rengas, Lutan and Takapan have higher number of genera than Lake Sembuluh and some riverine habitats in the forest area. Lake Lutan has the highest number of genera among the all habitats. On the other hand, Lake Sembuluh has lower number of genera but higher abundance of phytoplankton than Lake Lutan.
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