Hydrobiological studies in the gradient zone of the Vellar Estuary: 2. Nutrients

R. Chandran, K. Ramamoorthi


Water samples collected over a period of two years from the gradient zone of the Vellar Estuary, Tamil Nadu, India were analysed for PO4-P, NO2-N, NO3-N and SiO3-Si. Reactive phosphorus (PO4-P) showed wide fluctuations and inconsistent seasonal variations. Nitrite and nitrate values were high during monsoon and low during summer. Unlike other nutrients, silicate was high in the surface waters and showed significant negative relationship with salinity. Wide fluctuations in the N:P ratio was discernible


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