Fouzia Ishaq and Amir Khan
The present study was undertaken for a period of one year from August 2010 to July 2011 to assess the species diversity and impact of pollution on Limnological conditions of River Yamuna in Uttarakhand India. In the present study water samples were collected on monthly basis from three important sampling sites (Kalsi) S1, (Dakpathar) S2 and (Asan lake) S3 of River Yamuna in Dehradun District of Uttarakhand India. The samples were analysed for different physico-chemical attributes and various biological parameters including phytoplankton, zooplankton and Icthyofaunal diversity. In total, phytoplankton include 35 taxa belonging to three different families Chlorophyceae, Bacillariophyceae and Myxophyceae were recorded out of which highest diversity was found in case of Bacillariophyceae. Similarly 29 taxa of Zooplankton belonging to 4 different genera including Protozoa, Rotifera, Copepoda and Ostracoda were recorded with highest diversity in case of Rotifera. The results also revealed that Icthyofauna was recorded with 24 different taxa belonging to 7 families and 4 orders. The physico-chemical conditions were favourable for the growth and survival of aquatic organisms. The data collected was subjected to statistical analysis and significant correlation was found between the biological and physico-chemical parameters. The occurrence of plankton populations and fish diversity indicated a good water quality of River Yamuna in Uttarakhand with positive effect of physico-chemical factors on the growth of these ecological indicators of aquatic ecosystem.
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