Journal mondial de la biologie, de l'agriculture et des sciences de la santé

Abstrait

IMPACT OF PHYSICO-CHEMICAL CONDITIONS ON SEASONAL FLUCTUATION OF PLANKTON DIVERSITY IN CERTAIN WETLANDS OF TIPTUR TALUK, TUMKUR DIST, KARNATAKA, INDIA

Jagadeeshappa K.C. & Vijaya kumara

The increasing human activities in addition to natural causes affect on the wetland ecosystem. Amongst the various water bodies, wetlands also play an important role in the biodiversity of this region. The present study documents the distribution of phytoplankton, zooplankton and their correlation with physico-chemical conditions of water of four wetlands of Tiptur Taluk, Tumkur District, Karnataka, during the period of two year from June 2010 to May 2012. All the selected wetlands are surrounded by coconut garden in all the sides and having a direct connection with the Hemavathi river channel. The result revealed that there are 114 species of phytoplankton and 32 species of zooplankton were recorded from the wetlands. Among these, Chlorophyceae was the most dominant class in phytoplankton (62) (54.38 %), followed by Bacillariophyceae (27) (23.68 %), Cyanophyceae (17) (14.91%) and Euglenophyceae (8) (7.01%), while zooplankton, Rotifers constitutes (14) (43.75%), followed by Protozoa (4) (12.50%), Copepod (6) (18.75 %) and Cladocera (8) (25.00 %). In all these wetlands, the diversity of plankton is more in pre monsoon compared to post monsoon and monsoon season. The results of the present investigations are compared with literature values and investigation reveals that there is a fluctuation in the physico-chemical characters of the water. This will be due to entry of rain water and also due to change in the temperature, PH, turbidity, CO2, chloride, transparency, TDS, alkalinity and dissolved oxygen etc.