Preliminary observations on nutrient cycling and a stoichiometric model for elefsis bay, Greece |
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| Authors: | N Friligos |
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| Institution: | Institute of Oceanographic and Fisheries Research, Hellinikon, Athens, Greece |
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| Abstract: | The changes in the concentrations of silicate, phosphate and inorganic nitrogen in Elefsis Bay, an intermittently anoxic basin, are described and related to the changes in the physical properties of the water for two seasonal cycles. Winter convection resulted in a very small vertical gradient of temperature, salinity, oxygen and nutrients. Stratification started to develop in May and persisted for about 6 months. In Elefsis Bay, high values of silicate, phosphate and ammonia occurred during the anoxic conditions prevailing in summer. The consumption of oxygen in the lower water column was directly related to density differences in it. The regeneration of nutrients was related to the consumption of oxygen, with seasonal differences in the regeneration of nitrate and silicate. A stoichiometric model indicates that plankton organisms in Elefsis Bay have approximate ratios for C:N:P of 105:14:1, whereas the ratio for nitrogen and phosphorus in the water is only 2:1. The water/plankton relationship in Elefsis Bay appears to be very similar to that in the Baltic Sea. |
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