Phytoplankton production in the Tagus estuary (Portugal) |
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| Institution: | 1. Department of Biology & CESAM, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;2. Department of Physics & CESAM, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;1. Mote Marine Laboratory, Sarasota, FL, USA;2. Institute of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ, USA;3. Gulf of Mexico Coastal Ocean Observing System, College Station, TX, USA |
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| Abstract: | Biomass and phytoplankton photosynthetic response were studied in the lower Tagus estuary weekly, and related to environmental conditions in February, March and April 1994. The Photosynthesis-Irradiance (P?BI) relation was studied based on the light-saturated photosynthesis rate (PBm) and the light-limited initial slope (aB). The nutrient concentrations observed were high enough to be considered as not limiting phytoplankton growth. Tagus estuary phytoplankton seems, to a certain extent, adapted to high turbid conditions, being able to utilize the low light levels more efficiently, which was translated by high values of aB 0.10–0.20 mg C (mg Chl a)?1 h?1 (W m?2)?1]; however, light seems to limit phytoplankton production in the water column. |
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