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Microphytobenthos in the Oosterschelde estuary (The Netherlands), 1981-1990; consequences of a changed tidal regime de Jong, D.J.; Nienhuis, P.H.; Kater, B.J. (1994). Microphytobenthos in the Oosterschelde estuary (The Netherlands), 1981-1990; consequences of a changed tidal regime, in: Nienhuis, P.H. et al. The Oosterschelde Estuary (The Netherlands): A case-study of a changing ecosystem. Developments in Hydrobiology, 97: pp. 183-195. https://dx.doi.org/10.1007/978-94-011-1174-4_15 In: Nienhuis, P.H.; Smaal, A.C. (Ed.) (1994). The Oosterschelde Estuary (The Netherlands): A case-study of a changing ecosystem. Developments in Hydrobiology, 97. Springer Science+Business Media: Dordrecht. ISBN 978-94-010-4512-4; e-ISBN 978-94-011-1174-4. XXIV, 597 pp. https://dx.doi.org/10.1007/978-94-011-1174-4 In: Dumont, H.J. (Ed.) Developments in Hydrobiology. Kluwer Academic/Springer: The Hague; London; Boston; Dordrecht. ISSN 0167-8418, meer Is gerelateerd aan: de Jong, D.J.; Nienhuis, P.H.; Kater, B.J. (1994). Microphytobenthos in the Oosterschelde estuary (The Netherlands), 1981-1990: consequences of a changed tidal regime. Hydrobiologia 282: 183-195. https://dx.doi.org/10.1007/BF00024630, meer

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Trefwoorden

ANE, Ems-Dollard Estuary ANE, Netherlands, Oosterschelde Chemicals > Organic compounds > Organic nitrogen compounds > Heterocyclic nitrogen compounds > Porphyrins > Lipochromes > Chlorophyll Chlorophyll Flat Fluctuations Physics > Mechanics > Fluid mechanics > Hydrodynamics Population characteristics > Biomass Suspension > Resuspension Transport > Sediment transport Ems-Dollard estuarium [Marine Regions]; Oosterschelde [Marine Regions] Marien/Kust; Brak water

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Auteurs		Top
de Jong, D.J. Nienhuis, P.H. Kater, B.J.

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Abstract

During the period 1981-1990 the functioning of microphytobenthos in the carbon cycle was studied in the Oosterschelde, a mesotidal, euhaline estuary (SW Netherlands), both before and after completion of a storm-surge barrier in the sea ward entrance of the estuary in 1986, which reduced the tidal range to 88% and current velocities to 70% of their former values on average.The annual biomass cycle has changed from small spring and autumn peaks into a much larger summer peak. The average biomass during summer has increased from 70 to 170 mg Chlorophyll-a M² . The average annual biomass has increased from 115 to 195 mg Chlorophyll-a M² . As a consequence the (calculated) primary production by microphytobenthos has increased also, from 150 to 242 gC M-2 y-1 (14045 to 22265 tonnes C y-1), and its share in the total primary production of the Oosterschelde has increased from 16 to 30%. These increases in biomass and primary production are mainly ascribed to a decrease in the dynamic forces (water current velocities) over the intertidal flats in most parts of the basin. Increased water transparency in parts of the estuary and increased import of inorganic carbon from the water column towards shoals may have contributed as well. The rate of reworking of the top layer of the soil (0-10 cm) has not changed significantly, as the decrease in Chlorophyll-a biomass with depth has hardly changed.

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