Abstract
This study examines the seasonal shift of the phytoplankton assemblage of Kaptai Lake, Bangladesh, to elucidate the underlying drivers and ecological integrity. In 2020 and 2021, phytoplankton and physiochemical parameters were collected. There were found to be 59 genera of phytoplankton, with the pre-monsoon Zygnematophyceae having the highest seasonal dominance, followed by the monsoon Cyanophyceae and post-monsoon Chlorophyceae. The range of abundance was 0.89-2.95×106 cells/L, respectively. Alpha diversity indices revealed the phytoplankton community was highly diversified. Zygnematophyceae, Dinophyceae, and Bacillariophyceae were identified by SIMPER analysis as major contributors to community variation. Significant correlations were found between temperature, total dissolved solids, alkalinity, conductivity, and transparency, indicating their impact on the dynamics of phytoplankton with seasonal changes. These results demonstrate how the phytoplankton community of Kaptai Lake is rich and dynamic, influenced by seasonal variations in temperature and the resulting changes in the water’s chemistry. This information helps to build successful conservation plans and offers an insightful understanding of the ecology of freshwater lakes.
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