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Table 2.Calculation of Shannon index

Q NO NAME OF SPECIES No. of spp PI -Ln PI
1 Pteris spp. 5 0.26316 -0.35132

Alternanthera sessila 3 0.21429 -0.3301

Salvinia spp. 7 0.46667 -0.35567
Paspalum scrobiculatum 4 0.4 -0.36652

1.40359

2 Ludvigia perennis 4 0.2 -0.32189
Wedellia tuberosa 2 0.11111 -0.24414

Paspalum scrobiculatum 5 0.26316 -0.35132
Salvinia spp. 6 0.15385 -0.28797

1.20531
3 Alternanthera sessila 3 0.07317 -0.19134

Alternanthera philoxeroides 2 0.04878 -0.14734

Salvinia spp. 3 0.05085 -0.15147
Paspalum scrobiculatum 25 0.44643 -0.36003

0.85018
4 Tridax procumbens 8 0.21053 -0.32803

Paspalum scrobiculatum 3 0.08571 -0.21058

Alternanthera philoxeroides 20 0.55556 -0.32655
0.01497

5 Ludvigia perennis 1 0.04167 -0.13242
Utricularia aurea 6 0.2069 -0.32597

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