Distribution of nutrients in the nearshore waters off Mangalore

K. Suresh, M.P.M. Reddy

Abstract



A study on the availability of phosphate, nitrate and silicate in the nearshore waters off Mangalore at nine stations between Suratkal and Someshwara has been undertaken to understand the monthly, seasonal and spatial variations of these nutrients along this coast. In general, the phosphate content was found to be maximum in August (south-west monsoon) and minimum during January or February (north-east monsoon) and also increased with depth. The waters in the area under study indicated fairly high values of phosphate concentrations. Nitrate content was found to be high in May, August and September for all the stations, reaching maximum during August at the height of the south-west monsoon. Silicate content was also found to be maximum during August. A maximum silicate value of 91.12 mu g-at/1 for surface water was recorded at the nearshore station close to the Netravati-Gurpur river entrance during August

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