Table. 4.

Shannon–Weiner index (H) and Simpson index (D)

Sample Species Specific wealth (S) pi H = pi × ln (pi) piΛ2 1/Σ piΛ2
Northern sector of
the Chipoco River (3a, 3b, 3c, 3d, 3e)		 Rhoicosphenia abbreviata 70 0.25 –0.34 0.065
Epithemia turgida 50 0.18 –0.31 0.033
Caloneis bacillum 40 0.14 –0.28 0.021
Achnanthidium minutissimum 25 0.09 –0.21 0.008
Rhopalodia gibberula 20 0.07 –0.19 0.005
Amphora pediculus 15 0.05 –0.15 0.003
Amphora sp. 25 0.09 –0.21 0.008
Simonsenia delognei 7 0.02 –0.09 0.0006
Nitzschia lineari 7 0.02 –0.09 0.0006
Pinnularia sp. 7 0.02 –0.09 0.0006
Cyclotella sp. 7 0.02 –0.09 0.0006
Total 11 273 1 H = 2.105 0.1485 D = 6.7319
Central sector of
the Chipoco River (2a, 2b, 2c, 2d, 2e)		 Rhoicosphenia abbreviata 57 0.42 –0.36 0.17
Epithemia turgida 39 0.28 –0.35 0.08
Achnanthidium minutissimum 10 0.07 –0.19 0.005
Amphora pediculus 7 0.05 –0.15 0.002
Amphora sp. 7 0.05 –0.15 0.002
Simonsenia delognei 5 0.03 –0.12 0.001
Nitzschia lineari 5 0.03 –0.12 0.001
Pinnularia sp. 5 0,03 –0.12 0.001
Total 8 135 1 H = 1.588 0.276 D = 3.613
Southern sector of
the Chipoco River (1a, 1b, 1c, 1d, 1e)		 Rhoicosphenia abbreviata 45 0.44 –0.36 0.1985
Epithemia turgida 35 0.34 –0.36 0.120
Achnanthidium minutissimum 5 0.04 –0.14 0.002
Amphora pediculus 5 0.04 –0.14 0.002
Amphora sp. 2 0.01 –0.07 0.0003
Simonsenia delognei 2 0.01 –0.07 0.0003
Nitzschia lineari 5 0.04 –0.14 0.002
Pinnularia sp. 2 0.01 –0.07 0.0003
Total 8 101 1 H = 1.40 0.3271 D = 3.0569

Where H is the Shannon–Weiner index; pi, is the total proportion of numbers of individuals; ln (pi) natural logarithm of pi.
J Ecol Environ 2024;48:- https://doi.org/10.5141/jee.24.021
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