Pustaka Ilmiah Universitas Padjadjaran

Abstrak

Biomass Distribution and Phytoplankton Cell Size in Different Seasons at Cirata Reservoir, West Java, Indonesia

The study aims to determine the dynamics of phyto- plankton biomass and cells size in different seasons in Cirata Reservoir. Research was carried out for one year in two distinct seasons. The survey method was used in this study. Five locations were selected based on the difference values of BOD. Five sites are located at Patokbeusi, Jatinengang, Gandasoli, Cicendo and Cihea. The results showed that the biomass of phytoplankton in the rainy season was higher than in the dry season. This pattern was similar with the pattern of the abundance of phytoplankton. While the size of phytoplankton cells in the rainy season and in the dry season showed no significant difference, except for certain genus. Genus that showed difference in cells size were not the dominant ones. Phytoplankton biomass in the dry season ranged from 40.715 g/L in Gandasoli, up to 77.437 g/L in Cihea. Meanwhile, in the rainy season, the values ranged from 171.169 g/L up to 607.105 g/L respectively in Gandasoli and Cihea. Genus showing differences in cell size between rainy season and dry season were Tetrastum which had a cell size of 59.06 µm3 in the dry season and 109.39 µm3 in rainy season and Peridinium having size of 469.82 µm3 in dry season and 679.00 µm3 in rainy season.