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Practical difficulties in the application of correct statistical methods in field ecology are illustrated by a plankton abundancy estimation in a small pond. Random sampling was performed over a limited number of previously chosen sample places and times. A cylindric sampler was used, which...
From 1974 till 1977 research was carried out in the Kromme Rijn area. The aim of this research was to observe nature and quantity of the surface water and the different influences on the surface water (e.g. inflow from Rhine water, waste water, etc.). On the basis of monthly gathered data about...
In 24 hour experiments in a flow-through set-up the growth efficiency ofDaphnia magna fed withChlorella vulgaris was determined at different food concentrations. All parameters were measured simultaneously. Food uptake was measured with the Coulter Counter and in each experiment the conversion...
The moorland pools (“vennen”) near Oisterwijk are originally oligotrophic, because the soil consists of nutrient poor cover sands. The original vegetation of most pools belongs to theIsoeto-Lobelietum and the consociation ofCarex rostrata andSphagnum.
The moorland pools in the region of the SE of Oisterwijk have an established reputation among Dutch hydrobiologists. This fame is to a large extent attributable to the extensive surveys of the desmid flora by Professor J. Heimans in the period between 1916 and 1925. His studies revealed an...
This survey of the macrobenthos of the River IJssel, a branch of the River Rhine, was conducted in 1973, 1975, 1976 and 1977. The water quality was poor in 1973 and 1976 and relatively good in 1975 and 1977.
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