On the importance of sediment-water exchange processes of ammonia to primary production in shallow areas of the Sado estuary (Portugal) |
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Authors: | C. Rocha G. Cabeçadas M. J. Brogueira |
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Affiliation: | (1) Present address: IPIMAR, Av. de Brasília, 1400 Lisboa, Portugal |
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Abstract: | Coupling between the seasonal phytoplankton growth cycle and resuspension mechanisms in low depth areas was studied. Tidal flood in an estuarine inlet with a large area of intertidal flats was investigated with respect to nutrients and suspended particulate matter, during two different periods of the year. A prespring bloom period in March and another during the productive summer term in August were picked. Results indicate that tidal resuspension mechanisms are important in mobilizing NH4+ from the sediment surface pool, and that this additional input of the limiting nutrient is rapidly consumed in the flooding water column, in benefit of microphytes resident in the nutrient-poor, incoming,coastal waters. |
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Keywords: | Estuaries tidal-flats nutrients tidal-cycles sediment-water interactions |
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