River System Item Quantity Range of Variation
Rupsha-Pashur Total Species 93 species  
Abundance 2.28×104 cellsL-1 (Average) 3.755×103-1.015×105 cellsL-1
Diversity Index (H) 2.39 (Average) 1.31-4.64
Richness Index (d) 2.32 (Average) 1.21-4.99
Evenness Index(j) 0.94 (Average) 0.77-1.5
Khalpatua-Arpangachia Total Species 122 species  
Abundance 1.052×104 cellsL-1  (Average) 2.951×103-4.197×105 cellsL-1
Diversity Index (H) 2.63 (Average) 1.58-3.85
Richness Index (d) 3.36  (Average) 1.8-11.24
Evenness Index(j) 0.90 (Average) 0.82-0.97
Bhola-Baleswar Total Species 110 species  
Abundance 8.347×104 cellsL-1 (Average) 3.246×103-5.03×105 cellsL-1
Diversity Index (H) 2.80 (Average) 2.47-3.85
Richness Index (d) 2.75 (Average) 1.8-5.84
Evenness Index(j) 0.89 (Average) 0.78-0.94
Table 2: Annual mean values of phytoplankton species abundance in three major river systems.