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Urea as nitrogen source for phytoplankton production in coastal waters of goa india


Urea as nitrogen source for phytoplankton production in coastal waters of goa india



Indian Journal of Marine Sciences 14(2): 93-97



Annual variation of urea in coastal waters off Goa is 0-2.92 .mu.g-at N 1-1 and 0-4.69 .mu.g-at N 1-1 in adjacent estuarine waters of Mandovi. Peaks of phytoplankton production accompanied with the decrease in urea in June and Oct., when NH3 and NO3- were high, indicate that urea is used or decomposed by phytoplankton organisms. Seasonal fluctuation of urea is between 7 and 55% of total utilizable N, which is a large reserve of N for phytoplankton growth. Assimilation ratio (.DELTA.N:.DELTA.P) indicates that NO3- is in short supply, but urea available in these waters can substitute N deficiencies for the high rate of phytoplankton production.

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