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Seepage caused salinity gradients in a 120 cm deep ditch adjacent to Lake Veere in the Dutch Delta area. The water was mixed by strong horizontal currents, forced by a pumping engine. The restoration of vertical chloride and oxygen gradients was studied.
Seasonal changes in the activity of phytoplankton and benthic algae in relation to diurnal oxygen pulses were investigated in a 120 cm deep, brackish hypertrophic ditch. A vertical chloride gradient was built up by saline seepage and drain-water effluent. The stable chloride gradient could lead...
A new apparatus threedimensionally sieving with the help of a strong jet of water is described for separating plant litter and fauna components in different fractions. The apparatus may also be useful for selecting and collecting soil fauna.
A study was carried out on several production characteristics ofPhragmites australis stands in Lake Vechten, the Netherlands. The aim was to quantify the role of this plant species in the lake's primary production and nutrient cycles (C, N and P).
A comparison has been made between chlorophyll-a estimations based on the cold acetone extraction procedure and on the hot ethanol extraction method. When comparing the results obtained with both methods a standard deviation of 20% must be taken into account. A correlation between extraction...
In the present paper the general line of the research project on nymphaeid-dominated systems of the Laboratory of Aquatic Ecology (Catholic University, Nijmegen) is explained and a list of publications is given. In the nymphaeid system 16 structural elements could be distinguished which are...
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