Ecology of Uppanar Backwaters, Cuddalore: 1. Physico-chemical parameters

A. Murugan, K. Ayyakkannu


The present investigation was carried out for a period of two years (Oct.'86-Sep.'88) in Uppanar Backwaters of Cuddalore, Tamil Nadu, India (lat. 11 degrees 42'N; long. 79 degrees 46'E). Rainfall was higher during 1986-87 period, while temperatures at all levels showed higher values during 1987-88 period. The range of variation in temperature was 13 degrees C. Temperature was found to be more important as a co-variate with other factors than as an individual factor. Vertical stratification was not prominent. The range of variation in salinity was high at Station 2 (32.32 ppt). Station 2 showed less dissolved oxygen content owing to discharge of wastes from sewage outlets and coconut husk retting grounds. Though the wastes are discharged near Station 2, the oxygen level was higher probably due to high photosynthetic activity and high flushing characteristics of the Uppanar Backwaters. High transparency was found to be associated with high productivity. Station 1 showed high Secchi depth values owing to clear water. The pH values did not follow any definite seasonal pattern and the range of variation was narrow


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