Phytoplankton primary production and biomass in the western Wadden Sea (The Netherlands); A comparison with an ecosystem model |
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| Institution: | 1. McDonough School of Business, Georgetown University, 3700 O Street NW, Washington, DC, 20057, United States;2. Department of Real Estate, School of Design and Environment, National University of Singapore, 4 Architecture Drive, Singapore 117566;1. U.S. Geological Survey, Louisiana Fish and Wildlife Cooperative Research Unit, School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, United States of America;2. School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, United States of America;3. Louisiana Universities Marine Consortium, 8124 Highway 56, Chauvin, LA 70344, United States of America;4. Louisiana Universities Marine Consortium, 8124 Highway 56, Chauvin, LA 70344,, United States of America;1. Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Oldenburg, Germany;2. Microbiogeochemistry, Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Oldenburg, Germany;3. Hydrogeology and Landscape Hydrology, Department of Biology and Environmental Sciences, University of Oldenburg, Oldenburg, Germany;4. Biology of Geological Processes, Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Oldenburg, Germany |
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| Abstract: | Dissolved nutrient concentrations (Si, P, N), algal biomass (separated into diatoms and micro-flagellates), and total primary production were determined in 1986 during 7 cruises in both the inner and outer parts of the estuary of the western Wadden Sea. The biomass data, obtained after converting cell biovolume and cell counts into carbon, were compared with those simulated by a two-dimensional multitrophic ecosystem model.The general pattern of the succession of algal species was the same for all compartments: a bloom of diatoms in early spring followed by one of microflagellates, predominantly the colonial alga Phaeocystis pouchetii. Throughout the year the biomass of the two algal groups differed between inner and outer compartments of the estuary. In spring the carbon biomass of the microflagellates in the compartments bordering on the North Sea exceeded that of the inner compartments by a factor of 2. The reverse was found for the diatoms in summer.A reasonable fit between the field data and simulated data was only obtained in spring; large differences were found for the summer period. During that period an extensive diatom population characterized by a low primary production was observed, which did not correspond with the model simulation.Possible factors causing the differences between observed and simulated data, such as nutrient regeneration, were analysed. |
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