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Bory

Pinnularia major (Kützing) 2 0 3 Bacillariophyceae
Rabenhorst

Synedra capitata Ehrenberg 0 0 6 Bacillariophyceae

Meridion circulare (Greville) 0 0 12 Bacillariophyceae
C.Agardh

Nitzschia palea (Kützing) W.Smith 1 0 165 Bacillariophyceae

Eugulena viridis Ehrenberg 1 14 225 Euglenophyceae
Phacus longicauda (Ehrenberg) 0 22 35 Euglenophyceae

Dujardin
Table 2: Phytoplankton percentage composition of Jhil Area of Mankundu
Phytoplankton class percentage composition Jhil
Phytoplankton Classes Pre -monsoon Monsoon Post -monsoon

Chlorophyceae
17.64 36.36 25
Conjugatophyceae 5.88 0 0
Cyanophyceae 52.94 36.36 37.5
Bacillariophyceae
17.64 9.09 25
Euglenophyceae
5.88 18.18 12.5

Table 3: Various Diversity indices

Diversity Indices Pre-monsoon Monsoon Post-monsoon

Shannon 1.524 1.802 1.903
Simpson 0.584 0.787 0.797

Evenness 0.269 0.551 0.419

Table 4: Relationship between Shannon Diversity & pollution status

Species diversity Conditions

>3.0 Clean water
1.0-3.0 Moderately polluted

<1.0 Heavily polluted

Fig 2: Shannon Diversity Index value for the fresh water lentic water body under study

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