Phytoplancton en baie de Seine. Influence du panache fluvial sur la production primaire |
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| Institution: | 1. KU Leuven Kulak, Research Unit Food & Lipids, E. Sabbelaan 53, 8500 Kortrijk, Belgium;2. Leuven Food Science and Nutrition Research Centre (LFoRCe), KU Leuven, Kasteelpark Arenberg 20, 3001 Leuven, Belgium;3. Flemish Institute for Technological Research (VITO), Business Unit Separation and Conversion Technology (SCT), Boeretang 200, 2400 Mol, Belgium;4. University of Antwerp, Natural Products & Food Research and Analysis (NatuRA), Universiteitsplein 1, 2610 Antwerp, Belgium;5. Research Group Molecular Odor Chemistry, KU Leuven Campus Ghent, Technology Campus, Gebroeders De Smetstraat 1, B-9000 Ghent, Belgium;6. KU Leuven Kulak, Laboratory Aquatic Biology, E. Sabbelaan 53, 8500 Kortrijk, Belgium;1. IFREMER, Zone Portuaire de Brégaillon, 83500 La Seyne-sur-mer, France;2. DiSTAV, Department of Earth, Environment and Life Science, University of Genoa, Corso Europa 26, 16132 Genoa, Italy;3. Institute of Marine Science, CSIC, Barcelona, Spain;4. Centre d''Estudis Avançats de Blanes, CSIC, 17300 Blanes, Spain;5. Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, Marseille, France;6. Agence Française pour la Biodiversité, Antenne de Méditerranée, 26 rue de la République, 13001 Marseille, France;7. Parc Marin de la Côte Bleue, Observatoire-Plage du Rouet, 31 Avenue Jean Bart, BP. 42, 13620 Carry-le-Rouet, France;8. Aire marine protégée de la côte Agathoise, Direction Gestion du milieu marin Hôtel de Ville, 34300 Agde, France;9. Institut Méditerranéen de Biodiversité et d''Ecologie Marine et Continentale (IMBE), Aix Marseille Université, CNRS, IRD, Avignon Université, Station Marine d''Endoume, Chemin de la Batterie des Lions, F-13007 Marseille, France |
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| Abstract: | Phytoplankton distribution and primary productivity were investigated in the Bay of Seine (eastern English Channel, France) in spring and early summer of 1992 and 1994. In 1992, the horizontal distribution of phytoplankton species was determined over the whole Bay of Seine. In 1994, species distribution and primary productivity were studied along the salinity gradient of the Seine plume and in the neighbouring marine waters. Phytoplankton distribution was characterised by the permanent diatom dominance from early spring to early summer. The spring bloom did not occur uniformly over the bay, but was initiated in the marine waters, in the middle of the bay and progressed towards the coast where it developed, in June, in the diluted waters of the Seine plume. Phytoplankton distribution was also characterised by the dominance of large diatoms (Rhizosolenia) in marine waters and by the dominance of small species (Skeletonema costatum, Asterionella glacialis) in the plume waters. The greatest abundance of large diatoms was generally encountered below the euphotic zone. This accumulation seemed to be related to cell sedimentation and advection of marine waters below the diluted plume waters. The daily carbon productivity range was 1.4 to 3 g m?2 d?1. The highest values were measured in the plume waters (S > 28), suggesting the primary productivity in the plume was more controlled by light than by nutrients. The photic zone productivity/ chlorophyll a ratios (P/B; producted carbon per unit of Chla) were close to 40 mg mg?1 d?1 in the plume waters. P/B exceptionally reached 90 mg mg?1 d?1 in early summer. This value corresponded to a fast growing population of S. costatum. In marine waters, P/B varied from 22 mg mg?1 d?1, in spring, to 43 mg mg?1 d?1, in early summer. |
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