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Turbidity, nutrients and phytoplankton primary production in the Oosterschelde (The Netherlands) before, during and after a large-scale coastal engineering project (1980–1990)

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The Oosterschelde Estuary (The Netherlands): a Case-Study of a Changing Ecosystem

Part of the book series: Developments in Hydrobiology ((DIHY,volume 97))

Abstract

Turbidity, nutrient concentrations and phytoplankton primary production were monitored in the Oosterschelde before, during and after the construction of a storm-surge barrier and two compartment dams.

Flow velocities and suspended matter concentrations decreased severely, causing an increased transparency of the watercolumn. In the eastern and northern compartments, the previously pronounced seasonal variation disappeared.

Reduction of the freshwater load and decreasing nutrient concentrations in the adjacent North Sea coastal waters resulted in lower nitrite + nitrate and silicate concentrations. Autumn phosphate concentrations remained at the same level as before the nutrient reduction. Silicate was a limiting nutrient during the pre-barrier period and nitrogen and silicate were limiting during the post-barrier period.

Annual patterns in chlorophyll-a concentrations in the western and central compartments showed no obvious trend; in the eastern and northern compartments higher values were measured from 1985 onwards.

Primary production during the period 1980–1990 varied between 176 and 550 g C m-2 yr-1. The annual primary production in the western compartment had decreased, while in the central and eastern compartments annual primary production did not change: the formerly existing gradient disappeared. In the northern compartment higher chlorophyll-a concentrations and high annual production suggest that the phytoplankton could benefit from the increased transparency while nutrient concentrations were still high enough to support phytoplankton growth.

Changes in photosynthetic physiological parameters were observed which suggested shade adaptation. This is in contrast to improved light conditions and reduced nutrient availibility. The apparent incoherence with light-shade adaptation theory may be explained by the species shift that occurred.

As a result of the opposite effects of a more favourable light climate and a reduced nutrient availability, together with the resulting species shift, the annual primary production showed a large degree of homeostasis.

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Wetsteyn, L.P.M.J., Kromkamp, J.C. (1994). Turbidity, nutrients and phytoplankton primary production in the Oosterschelde (The Netherlands) before, during and after a large-scale coastal engineering project (1980–1990). In: Nienhuis, P.H., Smaal, A.C. (eds) The Oosterschelde Estuary (The Netherlands): a Case-Study of a Changing Ecosystem. Developments in Hydrobiology, vol 97. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1174-4_7

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