Nutrient limitation of phytoplankton growth in the freshwater tidal zone of a turbid,Mediterranean estuary |
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Authors: | Rita B Domingues Tânia P Anselmo Ana B Barbosa Ulrich Sommer Helena M Galvão |
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Institution: | 1. CIMA, Centre for Marine and Environmental Research, University of Algarve, Campus de Gambelas, 8005 139 Faro, Portugal;2. Leibniz Institute of Marine Sciences (IFM-GEOMAR), Düsternbrooker Weg 20, D-24105 Kiel, Germany |
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Abstract: | Identification of the limiting nutrient(s) is a requirement for the rational management of eutrophication. Here, we present the first experimental analysis of nutrient limitation of phytoplankton growth and its seasonal variation in the Guadiana estuary (SE Portugal-SW Spain). Ten microcosm experiments were performed during 2005 and 2008, using water samples collected in the freshwater tidal zone of the Guadiana estuary. Nitrate, phosphate and silicate were added in a single pulse, alone and in combinations. Experimental treatments were incubated for 4 days under controlled laboratory conditions. Phytoplankton response to nutrient enrichment was evaluated through changes in biomass (Chla), and abundance of specific phytoplankton groups. |
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Keywords: | phytoplankton nutrient limitation nutrient enrichment eutrophication freshwater tidal estuary Guadiana estuary |
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