Abstract
In the polder ‘Wormer, Jisp and Nek’, which forms part of a grossly eutrophicated region in the province North Holland, the effects of dredging and biomanipulation were studied in ditches. Four areas, including 5.7 ha surface water in total, were dammed up and dredged. It was feasible to remove the loose top-layer of sediments with a high content of phosphorus by modifications of the dredging machine. In two areas the fish stock was managed.
The measures resulted in an improvement of the water quality: an increase of the transparency and a decrease of suspended solids, phosphorus, nitrogen and algae. The chlorophyll-a concentration decreased nearly to l00 μg l−1 (summer average). The relative densities of diatoms, green algae and cyanobacteria did not change. The zooplankton community was dominated by small rotifers and crustaceans both before and after restoration measures. Cladocerans were scarcely present. In the second year after the measures, submerged macrophytes developed.
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Hovenkamp-Obbema, I.R.M., Fieggen, W. (1992). The effects of dredging and fish stocking on the trophic status of shallow, peaty ditches. In: Van Liere, L., Gulati, R.D. (eds) Restoration and Recovery of Shallow Eutrophic Lake Ecosystems in The Netherlands. Developments in Hydrobiology, vol 74. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2432-4_21
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DOI: https://doi.org/10.1007/978-94-011-2432-4_21
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