PHYTOPLANKTON DIVERSITY IN WETLANDS OF MYSORE DISTRICTTHOMAS MATHEW AND A.G. DEVI PRASAD
This study was carried out to determine the diversity of phytoplankton species along with the bioecological features in the wetlands of Mysore district. The investigation was conducted by selecting eight major wetlands from different parts of the district during the period November 2004 to October 2005. As a result of the study, a total of 2798 individuals belonging to 167 species and 76 genera were identified. Doora lake has highest number of species (164) and individuals (638), whereas Yennehole lake has low number of species(134) and individuals(187).Out of the 22 species of Euglenophyceae, only 5 species were present in all the eight wetlands. Dominance index values (DI%) showed that Cymbella hungarica (1.10), Cymbella pussila (1.03), Anabaena oscillarioides(1.03) and Scenadesmus bijugatus (1.00) are the most dominant species in these wetlands. Relative density values (RD) showed that among the species, the most rare were Dinoflagellates namely Ceratium cornutum (0.16) and Peridinium limbatu (0.33). In Yennehole lake, the diversity index (0.047) and eveness index (0.008) were very low, mainly because of lesser representation of Euglenophyceae and Bacillariophyceae. Among the groups of phytoplankton, Bacillariophyceae had an overall dominance (32.92%) with 921 individuals and Euglenophyceae with lowest dominance (09.97%) with 279 individuals.
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