Abstract
Water samples have been collected at four stations in Ria Formosa every two weeks, at low and high tide, over one year. From an inner zone of the lagoon, water was sampled daily, at low and high tide, over three neap-spring tidal cycles. Results showed that nutrients in the lagoon water vary with both the season and the tide. While nitrates are higher in winter/spring, increasing with seawater influx, concentrations of phosphates and silicates tend to fluctuate mainly with the tide, displaying higher values in periods of low tide. Therefore, nitrates seem to be imported from the coastal waters, while benthic regeneration is probably the major factor controlling the levels of phosphates, silicates and ammonium in the lagoon.
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