Studies on the phytoplankton and other algae of Indrasagar tank,Udaipur, India

Summary A study has been made of the productivity and periodicity of phytoplankton of the Indrasagar tank, Udaipur, in relation to physicochemical characteristics. Variations in the physical and chemical characteristics of water over a period of one year are described.The Tank is of eutrophic type. Green algae dominated the phytoplankton both as regards number of species and number of individuals.A definite phytoplankton periodicity has been observed, the green algae dominating in the rainy and winter seasons and the blue-greens during summer.A correlation of the phytoplankton productivity and physicochemical characteristics of Indrasagar tank indicates that the Chlorophyceae have a wide range of adaptability; the growth of diatoms is promoted by silica, nitrates and phosphates; and the growth of blue-green algae is controlled by pH and temperature.