Table 3 Comparison of fish species diversity [Margalef’s species richness (d), Pielou’s evenness (J’), Shannon index (H)] in the
South and Northern sector of Vembanad estuarine system
Region
Southern
Averge
Northern
Averge
Station
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
Margalef’s richness index
2.562
2.665
2.327
3.667
3.398
4.22
3.14
4.751
5.336
4.627
4.331
4.76
Pielou’s evenness index
0.7259
0.8235
0.9053
0.8435
0.8212
0.8692
0.83
0.9001
0.932
0.8279
0.7693
0.86
Shannon Wiener diversity index
2.836
3.294
3.447
3.762
3.549
3.876
3.46
4.28
4.701
4.176
3.914
4.27