Phytoplankton diversity of freshwater bodies of Chennai, India
International Journal of Environmental Biology
There are many freshwater bodies in and around Chennai city have been impacted by the anthropogenic activities such as encroachment, dumping of solid waste and pollution by letting untreated domestic sewage. In the present study11 lakes and one wet land were surveyed and current phytoplankton diversity of these water bodies pertaining to variation during pre-monsoon, monsoon, post-monsoon and summer seasons is reported. Fifty one species of phytoplankton belonging to Cyanophyceae (15),
... ceae (15), Chlorophyceae (20), Bacillariophyceae (14) and Euglenophyceae (2) were recorded. The order of dominance was: Chlophyceae > Cyanophyceae> Bacillariophyceae > Euglenophyceae. Seasonal contribution of four groups of phytoplankton in terms of diversity did not show much variation. The percentage composition of diversity of phytoplankton during pre-monsoon (July-September), monsoon (October-December), post-monsoon (January-March) and summer (April-June) showed variation. Comparatively lower diversity of phytoplankton is recorded in the present study than the previous reports on tropical freshwater bodies. Pollution indicator species of phytoplankton occurred in many lakes prominently. Urbanization has affected the diversity of phytoplankton which has led to the decline of productivity of these water bodies.