A comparative analysis of phytoplankton diversity and abundance during monsoon season in selected beels (wetlands) of Assam, India
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Abstract
Water collected from 8 selected floodplain wetlands (beels) of Brahmaputra valley basin were examined using both filtered method (FM) and sedimentation method (SM) for the assessment of phytoplankton diversity and abundance. A total 22 and 41 species were recorded by employing FM and SM, respectively. There was a significance difference (p<0.05) between FM and SM. Species and abundance of phytoplankton were lesser in FM than SM and it was due to exclusion of minute size (<25?) from net and maximum retention of species in sedimentation method. Chlorophyta, Bacillariophyta, Cyanophyta, Euglenophyta, Chrysophyta and Dinophyta were recorded during study period. Chlorophyta, Bacillariophyta and Cyanophyta were dominant groups. Bacillariophyta was dominant group followed by Chlorophyta and Cyanophyta in FM while Chlorophyta was dominant group followed by Bacillariophyta and Cyanophyta SM. Total phytoplankton densities were recorded from 35 cells L-1 to 3808 cells L-1 in FM while 1.55×104 cells L-1 to 12.33×105 cells L-1 to in SM. Diversity indices of phytoplankton were varied widely in FM and SM. Siligurijan beel and Bildora beels were considered more stable environment than other beels based on diversity indices.
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Beels, Diversity indices, Filtered method, Phytoplankton, Sedimentation method
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