The researchers studied the phytoplankton community in a tropical riverine reservoir to see how it changes over different seasons. They found that the types of phytoplankton present varied depending on the time of year. In the dry season, diatoms were the most common, while in the flood season, green algae, cyanophyta, and diatoms were abundant. Overall, they identified 140 different types of phytoplankton in the reservoir. The study showed that the composition of phytoplankton in the reservoir changed with the seasons, with different groups dominating at different times of the year.