Study of Phytoplanktons under Changing Environment of Lower Manair Dam and Manakondur Tank, Karimnagar, Telangana State, India

The Lower Manair Dam (LMD) gets water from Kakatiya canal which connects the Manair Dam and put to use for drinking purpose and irrigation purpose since from 1995. The Manakondur Tank (MT), which is located near the Karimnager city, provides water for irrigation, drinking and also used for recreational activities. Both the water bodies under study are also tourist places and covered with agriculture lands and rocky hills. There are many aquatic ecosystems which remain unexplored, in which LMD and MT were also not received attention. Hence, the present study was undertaken to elucidate certain aspects of ecology of phytoplanktons of the selected water bodies in Karimnager, Telangana State, India, with reference to their seasonal abundance and population dynamics under changing environment, during the period of September 2012 to August 2014. A total of 182 forms of euplanktonic and tycoplanktonic algae belonging to 94 genera were recorded from the sampling water bodies during the period of study. In the present investigation, four groups of algae were studied in which Bacillariophyceae, Chlorophyceae, Cyanophyceae and Euglenophyceae were identified. Community of phytoplankton was constituted by the members of 4 classes, of which 41 belonged to Bacillariophyceae, 65 to Chlorophyceae, 57 to Cyanophyceae and 19 to Euglenophyceae. The Chlorophyceae members were predominant over others in LMD, and Cyanophyceae over others in MT water body.